Dec. 2019, 日本植生史学会, 第5回論文賞　　　　　　　　　　　　　　　
「大型植物化石群から復元した北海道北部猿払川湿原群の発達過程」第27巻第1号
矢野梓水;百原 新;近藤玲介;宮入陽介;重野聖之;紀藤典夫;井上 京;横田彰宏;嵯峨山 積;横地 穣;横山祐典;冨士田裕子

2011, 農業農村工学会資源循環研究部会 部会長賞　　　　　　　　　　　　　　　
Japan

2009, 農業農村工学会北海道支部第8回支部賞　　　　　　　　　　　　　　　
Japan

2008, 農業農村工学会北海道支部第7回支部賞　　　　　　　　　　　　　　　
Japan

2004, 農業土木学会北海道支部第3回支部賞　　　　　　　　　　　　　　　
Japan

2000, Outstanding Contribution Award　　　　　　　　　　　　　　　

Topographic conditions as governing factors of mire vegetation types analyzed from drone‐based terrain model
Kazuhiro Kaneko, Minoru Yokochi, Takashi Inoue, Yukie Kato, Hiroko Fujita
Journal of Vegetation Science, 35, 1, Wiley, 17 Jan. 2024
Scientific journal, Abstract

Questions

Previous studies have shown that mire vegetation responds to fine‐scale differences in topography; however, very few studies have examined the relationship between multiple topographic conditions and vegetation distribution patterns by using topographic information with a resolution finer than microtopographic patches of sub‐meter scale in mires. Is it possible to predict vegetation distribution patterns in a mire using topographic information derived from drone imagery? How do topographic conditions affect the emergence of vegetation types?

Location

3 km² of sloping mire in eastern Hokkaido, northern Japan.

Methods

Digital surface models (DSMs) and orthomosaics were created using an affordable drone (Phantom3 advanced) and photogrammetry. We calculated 23 variables reflecting topographic conditions from DSMs. The locations of four vegetation types (Moliniopsis japonica–Eriophorum vaginatum, ME; Moliniopsis japonica–Carex lasiocarpa, MC; Sphagnum fuscum–Ledum palustre, SL; and Carex lyngbyei–Thelypteris palustris, CT) were recorded by field survey and orthomosaics. Random forest models that predicted vegetation types from topographic variables were created and we evaluated the prediction accuracy, importance of variables and effect of variables on the occurrence probability of the vegetation types.

Results

All predictive indicators (recall, precision, overall accuracy, kappa) were very high (>0.9). Important variables for modeling were altitude, relative height to the surroundings, slopes at a scale of several 10 m, soil wetness index and terrain ruggedness. Each vegetation type appeared under different topographic conditions; altitude was a key factor in ME and MC, and slope in CT. SL showed patchy distribution predictions on hummocks.

Conclusions

Vegetation distribution in the mire was strongly related to topographic information based on the DSMs. Analysis of the variable effects indicates that the emergence of the vegetation types was explained by a combination of multiple topographic conditions. This approach has the outstanding advantages of obtaining many survey points quickly and retrieving topographic conditions difficult to measure using on‐ground field surveys.

Radiocarbon dating of wetland sediment from the Konsen Plateau, eastern Hokkaido, Japan
Ren Tsuneoka, Yusuke Yokoyama, Wataru Sakashita, Kosuke Ota, Yosuke Miyairi, Reisuke Kondo, Minoru Yokochi, Kazuhiro Kaneko, Takashi Inoue, Norio Kito, Kyota Uemura, Mari Sumita, Arata Momohara, Hiroko Fujita
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 536, 67, 71, Elsevier BV, Mar. 2023, [Peer-reviewed]
Scientific journal

Factors of the Continuation of Regional Activities in Hokkaido Rural Area
Daichi IKEGAMI, Tadao YAMAMOTO, Takashi INOUE
Journal of Rural Planning Studies, 2, 1, 87, 95, Association of Rural Planning, 25 Nov. 2022, [Peer-reviewed]
Japanese, Scientific journal

Malfunction of Irrigation Pipelines Associated with Peat Subsidence
YOKOCHI Minoru, SEKIMOTO Koichi, INOUE Takashi
IDRE Journal, 314, 90-1, Ⅰ_45, Ⅰ_52, Jun. 2022, [Peer-reviewed], [Corresponding author]
Japanese, Scientific journal

Long term dynamics of surface fluctuation in a peat swamp forest in Sarawak, Malaysia
Yazid Imran, Lulie Melling, Guan Xhuan Wong, Ryusuke Hatano, Takashi Inoue, Edward Baran Aeries, Kah Joo Goh, Darrien Yau Seng Mah
Environmental Research Communications, 4, 4, Apr. 2022
Scientific journal, Tropical peatland is a complex and globally important wetland ecosystem, storing an enormous amount of the Earth's terrestrial carbon from centuries of organic material accumulation. In this ecosystem, peat swamp forests developed over an ombrogenous peat where hydrology influences its physico-chemical properties, one of which is fluctuation of the peat surface. While several studies of tropical peatland surface fluctuation have been reported, most are based on relatively short measurement periods or focused on drained areas. Hence, the objective of this study is to determine the long-term dynamics of peat surface fluctuation from an undrained peat swamp forest in relation to its water table depth. Peat surface level, water table, and rainfall were measured monthly at three experimental sites in a peat swamp forest in Sarawak, Malaysia over a period of about 10 years (2011-2020). The sites were different in soil structure and vegetation community; namely mixed peat swamp, Alan Batu, and Alan Bunga forests. Throughout the measurement period the peat surface in all sites exhibited consistent oscillating movement that generally follow the fluctuation of water table, with swelling and subsidence occurring after water table increase following high rainfall and receding water during dry spells respectively. Positive linear relationships were also found between peat surface level and water table (p < 0.05). Both the surface level and water table at all sites fell to their lowest during an intense dry period in 2019. Surface fluctuation at the Alan Batu site was most affected by seasonal changes in water table, which may be due to presence of vacant zones in the peat profile.

北海道石狩泥炭地に残存する乾燥化した小規模湿地での導水が地下水位と植生に与える影響
金子和宏, 冨士田裕子, 横地 穣, 加藤ゆき恵, 井上 京
植生学会誌, 39, 31, 41, 2022, [Peer-reviewed]
Japanese, Scientific journal

Subsidence of rice paddy and upland crop fields in Shinotsu Peatland, Hokkaido, Japan
Minoru Yokochi, Koichi Sekimoto, Takashi Inoue
Proceedings of the International Association of Hydrological Sciences, 382, 231, 235, Copernicus GmbH, 22 Apr. 2020, [Peer-reviewed], [Last author]
English, Scientific journal, Abstract. Agricultural land use on peatlands inevitably causes
ongoing land surface subsidence resulting in a reduction of productivity. In
addition, oxidation of the peat substrate associated with subsidence is
responsible for greenhouse gas emission with the ensuing consequence for
global climatic stability. A concept of “paludiculture”, the utilisation
of wet or rewetted peatlands for agriculture, has been proposed in European
countries to avoid further subsidence and greenhouse gas emission. However,
few studies have documented a long-term record of subsidence through
agriculture in wet peatlands such as paddy fields for rice cultivation. In
this study, we measured the subsidence rates of peatland in rice paddy use
and compared them to the rates in peatland with upland crop cultivation. The
average subsidence between 2006 and 2016 for the paddy plots was 3.6±1.9 cm (± SE) and significantly less than that of 25.6±1.7 cm
for the upland plots, and the subsidence reduced linearly as the period of
paddy use increased. These results suggest that paddy use of peatlands can
effectively reduce subsidence. Our results will encourage the use of
peatlands with a wet environment as one of the valid options for future
peatland management in terms of mitigation of land subsidence and peat loss.

Development and management of river flood controls and water utilization facilities in the middle and lower reaches of the Ishikari River over 100 years -Transformation of cold region peatlands into one of Japan’s top rice cultivation areas, leading to the formation of a major economic zone-
Hideto Kon, Takashi Inoue, Yasuyuki Hirai, Kazumasa Nakamura, Satomi Kawamura
Proceedings of the 22nd IAHR-APD Congress 2020, Sapporo, Japan, 1, 8, 2020, [Peer-reviewed]
English, International conference proceedings, In Hokkaido, a cold region in northern Japan, full-scale land reclamation started when the local headquarters of the Hokkaido Development Commission was established in Sapporo in 1871. The center of land reclamation in Hokkaido was the Ishikari River Basin, the second largest river in Japan, where the city of Sapporo is now located. In particular, the middle and lower reaches of the Ishikari River basin downstream from Kamuikotan was a primeval swamp and peatland at that time, which hindered its reclamation. However, the development and appropriate management of river flood control and water utilization facilities in the middle and lower reaches resulted in changes. The peatland in this cold region were transformed into one of Japan's leading rice cultivation areas. The transformation of this region into a major economic zone was realized in a relatively short period of one hundred-odd years. Cut-off works were selected as the principal improvement method in the beginning of flood control of the middle and lower reaches of the Ishikari River. The construction of 29 cut-off works has provided a dramatic improvement of the safety level of flood control in the basin. In addition, the water level of the mainstream and tributaries in normal period decreased, making the improvement of trunk and branch water channels possible. As a result, an area of peatland was transformed into the present-day vast rice cultivation areas in a short period of time. The development of this region would not have been possible without the improvement of the mainstream of the Ishikari River. This paper describes the development and management of river flood controls and water utilization facilities in the middle and lower reaches of the Ishikari River as well as the important roles they played in contributing to the development of the basin.

Evaluation of Water Shortages in Agricultural Water Use in the Sangker River Basin, Cambodia　　　　　　　　　　　　　　　
Chey Vanna, Tadao Yamamoto, Inoue Takashi
International Journal of Environmental and Rural Development, 11, 1, 32, 39, 2020, [Peer-reviewed], [Last author]
English, Scientific journal

Examination of Optimal Search Method of Unknown Parameters in Tank Model by Monte Carlo Method　　　　　　　　　　　　　　　
Koji Miwa, Kosuke Mukae, Hiromu Okazawa, Tadao Yamamoto, Takashi Inoue, Emmauel Okiria
International Journal of Environmental and Rural Development, 11, 1, 1, 7, 2020, [Peer-reviewed]
English

担い手への農地集積の進展による集落構造の変化が用水管理体制へ及ぼす影響とその対応策ー新潟県上越市三和区を事例としてー　　　　　　　　　　　　　　　
矢挽 尚貴, 山本 忠男, 井上 京
農村計画学会誌論文特集号, 38, 238, 245, Nov. 2019, [Peer-reviewed], [Last author]
Japanese, Scientific journal

Functional Evaluation of Groundwater Level Decrease in Non-sloped Subsurface Drainage Systems in Upland Field on Peatland　　　　　　　　　　　　　　　
Naho Nohara, MinoruYokoshi, Tadao Yamamoto, Takashi Inoue
International Journal of Environmental and Rural Development, 10, 2, 107, 112, 2019, [Peer-reviewed], [Last author]
English, Scientific journal

圃場整備事業を通じた広域的な担い手の経営規模拡大行動分析 ―新潟県上越市三和区の事例―　　　　　　　　　　　　　　　
矢挽尚貴, 風間十二朗, 玉井英一, 山本忠男, 井上 京
農業農村工学会論文集, 87, 2, I_327, I_338, 2019, [Peer-reviewed], [Last author]
Japanese, Scientific journal

Variation in Soil Properties Regulate Greenhouse Gas Fluxes and Global Warming Potential in Three Land Use Types on Tropical Peat
Kiwamu Ishikura, Untung Darung, Takashi Inoue, Ryusuke Hatano
Atmosphere, 9, 12, 465, 465, MDPI AG, 27 Nov. 2018, [Peer-reviewed]
English, Scientific journal, This study investigated spatial factors controlling CO2, CH4, and N2O fluxes and compared global warming potential (GWP) among undrained forest (UDF), drained forest (DF), and drained burned land (DBL) on tropical peatland in Central Kalimantan, Indonesia. Sampling was performed once within two weeks in the beginning of dry season. CO2 flux was significantly promoted by lowering soil moisture and pH. The result suggests that oxidative peat decomposition was enhanced in drier position, and the decomposition acidify the peat soils. CH4 flux was significantly promoted by a rise in groundwater level, suggesting that methanogenesis was enhanced under anaerobic condition. N2O flux was promoted by increasing soil nitrate content in DF, suggesting that denitrification was promoted by substrate availability. On the other hand, N2O flux was promoted by lower soil C:N ratio and higher soil pH in DBL and UDF. CO2 flux was the highest in DF (241 mg C m−2 h−1) and was the lowest in DBL (94 mg C m−2 h−1), whereas CH4 flux was the highest in DBL (0.91 mg C m−2 h−1) and was the lowest in DF (0.01 mg C m−2 h−1), respectively. N2O flux was not significantly different among land uses. CO2 flux relatively contributed to 91–100% of GWP. In conclusion, it is necessary to decrease CO2 flux to mitigate GWP through a rise in groundwater level and soil moisture in the region.

Performance Evaluation of Multistage Constructed Wetland Systems Combined with Solid-Liquid Separation for Animal Manure Treatment　　　　　　　　　　　　　　　
K. Kato, H. Ietsugu, K. Kikuma, M. Tsuji, M. Sasaki, F. Kikuchi, N. Fukuju, K. Aoki, T. Inoue
IWA Specialist Conference on Wetland Systems for Water Pollution Control 30 September – 4 October 2018, UPV, Valencia, Spain, 2018, [Last author]
English, International conference proceedings

大型植物化石群から復元した北海道北部猿払川湿原群の発達過程　　　　　　　　　　　　　　　
矢野梓水, 百原 新, 近藤玲介, 宮入陽介, 重野聖之, 紀藤典夫, 井上 京, 横田彰宏, 嵯峨山積, 横地 穣, 横山祐典, 冨士田裕子
植生史研究, 27, 1, 17, 30, 2018, [Peer-reviewed]
Japanese, Scientific journal

Application of TOPMODELs for Assessment of Ecosystem Services: Regulating Service in Agricultural and Forest Watershed　　　　　　　　　　　　　　　
Kosuke MUKAE, Koji MIWA, Hiromu OKAZAWA, Tadao YAMAMOTO, Takashi INOUE
International Journal of Environmental and Rural Development, 9, 1, 43, 50, 2018, [Peer-reviewed], [Last author]
English, Scientific journal

Multi-stage hybrid subsurface flow constructed wetlands for treating piggery and dairy wastewater in cold climate
Xiaomeng Zhang, Takashi Inoue, Kunihiko Kato, Hayato Izumoto, June Harada, Da Wu, Hiroaki Sakuragi, Hidehiro Ietsugu, Yasuhide Sugawara
ENVIRONMENTAL TECHNOLOGY, 38, 2, 183, 191, TAYLOR & FRANCIS LTD, 2017, [Peer-reviewed], [Corresponding author]
English, Scientific journal, This study followed three field-scale hybrid subsurface flow constructed wetland (CW) systems constructed in Hokkaido, northern Japan: piggery O (2009), dairy G (2011), and dairy S (2006). Treatment performance was monitored from the outset of operation for each CW. The ranges of overall purification efficiency for these systems were 70-86%, 40-85%, 71-90%, 91-96%, 94-98%, 84-97%, and 70-97% for total N (TN), NH4-N, total P, chemical oxygen demand (COD), biochemical oxygen demand, suspended solid, and total Coliform, respectively. The hybrid system's removal rates were highest when influent loads were high. COD removal rates were 46.4 +/- 49.2, 94.1 +/- 36.6, and 25.1 +/- 15.5 g COD m(-2) d(-1) in piggery O, dairy G, and dairy S, with average influent loads of 50.5 +/- 51.5, 98.9 +/- 37.1, and 26.9 +/- 16.0 g COD m(-2) d(-1), respectively. The systems had overall COD removal efficiencies of around 90%. TN removal efficiencies were 62 +/- 19%, 82 +/- 9%, and 82 +/- 15% in piggery O, dairy G, and dairy S, respectively. NH4-N removal efficiency was adversely affected by the COD/TN ratio. Results from this study prove that these treatment systems have sustained and positive pollutant removal efficiencies, which were achieved even under extremely cold climate conditions and many years after initial construction.

Long-term nitrogen compound removal trends of a hybrid subsurface constructed wetland treating milking parlor wastewater throughout its 7 years of operation
J. Harada, T. Inoue, K. Kato, H. Izumoto, X. Zhang, H. Sakuragi, D. Wu, H. Ietsugu, Y. Sugawara
Water Science and Technology, 73, 5, 1018, 1024, IWA Publishing, 04 Mar. 2016, [Peer-reviewed], [Corresponding author]
English, Scientific journal, This study evaluated the nitrogen compound removal efficiency of a hybrid subsurface constructed wetland, which began treating milking parlor wastewater in Hokkaido, northern Japan, in 2006. The wetland's overall removal rates of total nitrogen (TN) and ammonium (NH4+-N) improved after the second year of operation, and its rate of organic nitrogen (Org-N) removal was stable at 90% efficiency. Only nitrate (NO3−-N) levels were increased following the treatment. Despite increased NO3−-N (maximum of 3 mg-N/L) levels, TN removal rates were only slightly affected. Removal rates of TN and Org-N were highest in the first vertical bed. NH4+-N removal rates were highest in the second vertical bed, presumably due to water recirculation and pH adjustment. Concentrations of NO3−-N appeared when total carbon (TC) levels were low, which suggests that low TC prevented complete denitrification in the second vertical bed and the final horizontal bed. In practice, the beds removed more nitrogen than the amount theoretically removed by denitrification, as calculated by the amount of carbon removed from the system. This carbon-nitrogen imbalance may be due to other nitrogen transformation mechanisms, which require less carbon.

Performance of hybrid subsurface constructed wetland system for piggery wastewater treatment
X. Zhang, T. Inoue, K. Kato, J. Harada, H. Izumoto, D. Wu, H. Sakuragi, H. Ietsugu, Y. Sugawara
Water Science and Technology, 73, 1, 13, 20, IWA Publishing, 08 Jan. 2016, [Peer-reviewed], [Corresponding author]
English, Scientific journal, The objective of this study was to evaluate performance of a hybrid constructed wetland (CW) built for high organic content piggery wastewater treatment in a cold region. The system consists of four vertical and one horizontal flow subsurface CWs. The wetland was built in 2009 and water quality was monitored from the outset. Average purification efficiency of this system was 95 ± 5, 91 ± 7, 89 ± 8, 70 ± 10, 84 ± 15, 90 ± 6, 99 ± 2, and 93 ± 16% for biochemical oxygen demand (BOD5), chemical oxygen demand (COD), total carbon (TC), total nitrogen (TN), ammonium-N (NH4-N), total phosphorus (TP), total coliform (T. Coliform), and suspended solids (SS), respectively during August 2010–December 2013. Pollutant removal rate was 15 ± 18 g m−2 d−1, 49 ± 52 g m−2 d−1, 6 ± 4 g m−2 d−1, 7 ± 5 g m−2 d−1, and 1 ± 1 g m−2 d−1 for BOD5, COD, TN, NH4-N, and TP, respectively. The removal efficiency of BOD5, COD, NH4-N, and SS improved yearly since the start of operation. With respect to removal of TN and TP, efficiency improved in the first three years but slightly declined in the fourth year. The system performed well during both warm and cold periods, but was more efficient in the warm period. The nitrate increase may be attributed to a low C/N ratio, due to limited availability of carbon required for denitrification.

20 有機性排水を浄化する多段型伏流式人工湿地ろ過システムの処理効果と設計・管理方法（東北支部講演会，2015年度各支部会）
加藤 邦彦, 井上 京, 家次 秀浩, 辻 盛生, 菅原 保英, 張 暁萌, 泉本 隼人, 青木 和彦, 戸上 和樹, 工藤 一晃, 三浦 憲蔵, 岡 紀邦
日本土壌肥料学会講演要旨集, 62, 256, 256, 一般社団法人 日本土壌肥料学会, 2016
Japanese

Multi-stage subsurface flow constructed wetland systems for organic wastewater treatment with stable performance for long term including winter season
KATO Kunihiko, INOUE Takashi, IETSUGU Hidehiro, TSUJI Morio, SUGAWARA Yasuhide, ZHANG Xiaomeng, HARADA June, IZUMOTO Hayato, AOKI Kazuhiko
Japanese Journal of Soil Science and Plant Nutrition, 87, 6, 467, 471, Japanese Society of Soil Science and Plant Nutrition, 2016, [Peer-reviewed]
Japanese, Scientific journal

Concentrations, loads and yields of organic carbon from two tropical peat swamp forest streams in Riau province, Sumatra, Indonesia
H. M. Yupi, Takashi Inoue, J. Bathgate, R. Putra
Mires and Peat, 18, 1, 15, IMCG and IPS, 2016, [Peer-reviewed], [Corresponding author]
English, Scientific journal, Tropical peat swamp forest (PSF) stores large quantities of carbon. To estimate how much organic C is released from this type of landscape we determined organic carbon (C) concentrations, loads and yields in two contrasting watercourses draining from PSF in Riau Province, Sumatra (Indonesia). Meranti Ditch (MD) is an artificial watercourse whose small catchment (estimated area 4.8 km2) is in semi-intact condition, whereas Turip River (TR) has a large natural catchment (estimated area 458 km2) covered with fairly intact PSF where >
75% of the original canopy trees remain. The organic C load (Gg C yr-1) of each watercourse was calculated by combining TOC concentration with water discharge rate to give organic C yield (g C m-2 yr-1). Dissolved organic carbon (DOC) was the dominant (95.0-99.8%) component of total organic carbon (TOC) in the water. TOC concentration was 85-94 mg C L-1 in MD and 50-58 mg C L-1 in TR. The high concentration in MD was not surprising because this catchment had been disturbed by repeated phases of logging and a dense network of ditches was excavated ten years ago. The TOC loads were 0.23 Gg C yr-1 in MD and 14.0 Gg C yr-1 in TR. TOC yields (i.e. TOC fluxes through the fluvial system) were 41.6-55.5 g C m-2 yr-1 in MD and 26.2-34.9 g C m-2 yr-1 in TR.

大型植物遺体に基づく北海道北部猿払川丸山湿原の後期完新世植生変遷　　　　　　　　　　　　　　　
矢野梓水, 百原 新, 紀藤典夫, 近藤玲介, 井上 京, 冨士田裕子
利尻研究, 35, 83, 91, 2016, [Peer-reviewed]
Japanese, Scientific journal

Performance evaluation of hybrid treatment wetland for six years of operation in cold climate
June Harada, Takashi Inoue, Kunihiko Kato, Nana Uraie, Hiroaki Sakuragi
Environmental Science and Pollution Research, 22, 17, 12861, 12869, Springer Science and Business Media LLC, Sep. 2015, [Peer-reviewed], [Corresponding author]
English, Scientific journal, In Hokkaido, northern Japan, there are 12 hybrid subsurface constructed wetlands (HSCWs) and most of them are treating high concentrated organic wastewater. One of these systems is an HSCW situated in Embetsu, northern Hokkaido, and it has been in operation since November of 2006 to treat dairy milking parlor wastewater. The system is composed of two vertical flow beds and a horizontal flow bed. The influent and the effluent flow rates and pollutant concentrations and loads were extremely variable. Throughout its 6 years of operation, most of the pollutant removals were decently high. Removal efficiencies for COD, BOD5, and SS were ranging in the 90 %. Removal efficiencies for TN, NH4-N, and BOD5 were improving because of the development of the soil ecosystem and the Phragmites australis community. However, the removal efficiencies of TP were decreasing, presumably because of the declining adsorption ability. The accumulation of TP in the first and the second vertical beds had reached its plateau. Vertical beds had high removal efficiencies for TN, COD, BOD5, and SS. These high removal efficiencies of the first vertical bed may be caused from the efficient removal of solid material that is deposited as an organic layer of the first vertical bed. High NH4-N removal efficiencies exerted by the second vertical bed may be due to the recycling of wastewater. In conclusion, the HSCW was working excellently for its 6 years of operation, and it could be concluded that it has not reached its life yet.

Performance of hybrid constructed wetland systems for high content wastewater treatment in cold climate　　　　　　　　　　　　　　　
X. Zhang, T. Inoue, K. Kato, J. Harada, H. Izumoto, H. Ietsugu, Y. Sugawara
Book of abstracts, 6th International Symposium on Wetland Pollutant Dynamics and Control 13-18 September 2015, York, United Kingdom, 275, 276, 2015, [Peer-reviewed], [Corresponding author]
English, International conference proceedings

Estimation of seasonal change of treatment performance by adjusting temperature coefficient for hybrid wetland systems treating agricultural wastewater in cold climate　　　　　　　　　　　　　　　
Kunihiko Kato, Takashi Inoue, Hidehiro Ietsugu, Yasuhide Sugawara, June Harada, Xiaomeng Zhang, Hayato Izumoto
Book of abstracts, 6th International Symposium on Wetland Pollutant Dynamics and Control 13-18 September 2015, York, United Kingdom, 270, 271, 2015, [Peer-reviewed]
English, International conference proceedings

Phosphorus removal in three full-scale hybrid subsurface constructed wetland systems　　　　　　　　　　　　　　　
T. Inoue, H. Izumoto, K. Kato, X. Zhang, J. Harada, H. Ietsugu, Y. Sugawara
Book of abstracts, 6th International Symposium on Wetland Pollutant Dynamics and Control 13-18 September 2015, York, United Kingdom, 248, 249, 2015
English, International conference proceedings

Peatland Tank Model for evaluation of shallow groundwater table data without height reference from benchmark　　　　　　　　　　　　　　　
Xin He, Takashi Inoue
International Journal of Environmental and Rural Development, 6, 16, 21, 2015, [Peer-reviewed]
English, Scientific journal

Evaluation of Oxbow Lakes and Circulating Irrigation in the Ishikari River Basin, Japan　　　　　　　　　　　　　　　
KUSA Daisuke, YAMAMOTO Tadao, INOUE Takashi, NAGASAWA Tetuaki
International Journal of Environment and Rural Development, 5, 1, 65, 71, Apr. 2014, [Peer-reviewed]
English, Scientific journal

Long Term nitrogen compound removal trend of a hybrid subsurface constructed wetland treating milking parlour wastewater throughout its seven years of operation　　　　　　　　　　　　　　　
J. Harada, T. Inoue, K. Kato, H. Izumoto, X. Zhang, H. Sakuragi, D. Wu, H. Ietsugu, Y. Sugawara
9th IWA International Symposium on Waste Management problems in Agro-Industries 24-26 November 2014, Kochi, Japan, 2014
English, International conference proceedings

Performance of hybrid constructed wetland system for piggery wastewater treatment　　　　　　　　　　　　　　　
X. Zhang, T. Inoue, K. Kato, J. Harada, H. Izumoto, D. Wu, H. Sakuragi, H. Ietsugu, Y. Sugawara
9th IWA International Symposium on Waste Management problems in Agro-Industries 24-26 November 2014, Kochi, Japan, 2014
English, International conference proceedings

Peatland Tank Model for Evaluating fluctuations of Shallow Groundwater Table in Peatland　　　　　　　　　　　　　　　
Xin He, Takashi Inoue
Abstract book of International Peat Technology Symposium 2014, 25-29 August 2014, Riga, Latvia, 25, 29, 2014
English, International conference proceedings

Evaluation of Oxbow Lakes and Circulating Irrigation in the Ishikari River Basin, Japan　　　　　　　　　　　　　　　
Daisuke Kusa, Tadao Yamamoto, Takashi Inoue, Tetuaki Nagasawa
International Journal of Environmental and Rural Development, 5, 1, 65, 71, 2014
English, Scientific journal

Water Quality Preservation Effect of Riparian Forests in Watersheds with Dairy Farming Areas in Eastern Hokkaido　　　　　　　　　　　　　　　
OKazawa Hiromu, YAMAMOTO Tadao, INOUE Takashi, NAGASAWA Tetuaki
International Journal of Environment and Rural Development, 4, 1, 183, 189, Apr. 2013, [Peer-reviewed]
English, Scientific journal

Change in distribution of the vascular plant Sasa palmata in Sarobetsu Mire between 1977 and 2003
Yoshiyasu Fujimura, Masayuki Takada, Hiroko Fujita, Takashi Inoue
Landscape and Ecological Engineering, 9, 2, 305, 309, Springer Science and Business Media LLC, 2013, [Peer-reviewed]
English, Scientific journal, In recent decades, the extent of Sasa palmata-dominant communities has increased in Sarobetsu Mire in northern Hokkaido, Japan, replacing the original Sphagnum bog vegetation. However, this marked increase in distribution of Sasa in the mire has not been formally documented or investigated in detail. Using aerial photo-interpretation, the present study updated the distribution maps of Sasa communities, showing the changes that have occurred to these communities between 1977 and 2003. The results revealed that the extent of Sasa communities has increased by 15.8 % from 6.60 km2 in 1977 to 7.64 km2 in 2003. The most marked increase occurred on the ground associated with drainage channels, although the oldest channels were constructed more than half a century ago, suggesting that some responses to the drainage of peat bog ecosystems may take a considerable period of time before becoming particularly evident. © 2012 International Consortium of Landscape and Ecological Engineering and Springer.

Performance of a Multi-Stage Hybrid Constructed Wetland System for Swine Wastewater Treatment in a Cold Climate　　　　　　　　　　　　　　　
Kunihiko Kato, Takashi Inoue, Hidehiro Ietsugu, Yasuhide Sugawara, June Harada, Hiroaki Sakuragi, Kitagawa Katsuji
Proceedings of the 5th International Symposium on Wetland Pollutant Dynamics and Control 13-17 October 2013, Nantes, France, 305, 306, 2013
English, International conference proceedings

Efficiency of Hybrid Subsurface Constructed Wetland for the Treatment of Mixture of Point and Non-point Source Load　　　　　　　　　　　　　　　
Takashi Inoue, Hiroaki Sakuragi, Kunihiko Kato, June Harada, Wu Da
Proceedings of the 5th International Symposium on Wetland Pollutant Dynamics and Control 13-17 October 2013, Nantes, France, 216, 217, 2013
English, International conference proceedings

Performance Evaluation of Long Term Usage of Treatment Wetland in Cold Climate　　　　　　　　　　　　　　　
June Harada, Takashi Inoue, Kunihiko Kato, Nana Uraie, Hiroaki Sakuragi
Proceedings of the 5th International Symposium on Wetland Pollutant Dynamics and Control 13-17 October 2013, Nantes, France, 52, 53, 2013
English, International conference proceedings

Design and performance of hybrid constructed wetland systems for high-content wastewater treatment in the cold climate of Hokkaido, northern Japan
K. Kato, T. Inoue, H. Ietsugu, H. Sasaki, J. Harada, K. Kitagawa, P. K. Sharma
Water Science and Technology, 68, 7, 1468, 1476, IWA Publishing, 2013, [Peer-reviewed]
English, Scientific journal, The performance of six multistage hybrid constructed wetland systems was evaluated. The systems were designed to treat four kinds of high-content wastewater: dairy wastewater (three systems, average inflow content 2,400–5,000 mg·COD l−1, 3–6 years of operation); pig farm wastewater, including liquid food washing wastewater (one system, 9,500 mg·COD l−1, 3 years); potato starch processing wastewater (one system, 20,000–60,000 mg·COD l−1, 3 years); and wastewater containing pig farm swine urine (one system, 6,600 mg·COD l−1, 2.8 years) (COD = chemical oxygen demand). The systems contained three or four vertical (V) flow beds with self-priming siphons and surface partitions and no or one horizontal (H) flow bed (three to five beds). In some V flow beds, treated effluents were recirculated (Vr) through the inlet to improve performance. Mean annual temperature was 5–8 °C at all locations. To overcome clogging due to the high load in a cold climate, we applied a safety bypass structure and floating cover material to the V flow beds. Calculated average oxygen transfer rates (OTRs) increased proportionally with the influent load, and the OTR value was Vr &gt; V&gt; H. The relations of load–OTR, COD–ammonium, and a Arrhenius temperature-dependent equation enable the basic design of a reed bed system.

Effects of load fluctuations on treatment potential of a hybrid sub-surface flow constructed wetland treating milking parlor waste water
Pradeep Kumar Sharma, Inoue Takashi, Kunihiko Kato, Hidehiro Ietsugu, Kunihiko Tomita, Tetsuaki Nagasawa
Ecological Engineering, 57, 216, 225, Elsevier science bv, 2013, [Peer-reviewed]
English, Scientific journal, A hybrid sub-surface constructed wetland (CW) system consisting of 2 gravel filled vertical sub-surface (VFa & VFb) beds, each 160 m2 in size planted with Phragmites australis and a sand filled horizontal sub-surface (HF) bed, 336 m2 in size, planted with rice was operated from 2007 to 2010 for treating milking parlor waste water in Hokkaido, Japan. Hybrid CW system received huge fluctuations in average yearly inlet loads for TSS (526.0-1259mgL-1 & 2.7-9.0gm-2d-1), BOD5 (1,080-2,114mgL-1 & 8.4-14.4gm-2d-1), COD(1,962-7,085mgL-1 & 14.5-50.0gm-2d-1), TN (116.0-243.0mgL-1 & 0.8-1.6gm-2d-1), NH4-N (54.0-90.0mgL-1 & 0.40-0.64gm-2d-1), TC (1,022-2,215mgL-1 & 6.0-15.1gm-2d-1), TP (15.3-41.7mgL-1 & 0.11-0.28gm-2d-1) during study period. Average yearly purification and removal rates were least fluctuated for TSS (95.7-99.4%); moderately for BOD5 (86.1-95.7%), COD(87.5-96.1%) and TC (79.5-91.3%); highly for TN (72.6-90.6%), NH4-N (62.9-85.3%) and TP (64.8-87.2%). A sharp decrease in TP purification and removal rates were observed in 2008 due to sharp decrease in influent TP concentration in 2008 compared to 2007. OTR values for VF(a), VF(b), HF bed and total system were observed as 21.7, 19.3, 4.8 and 12.3gO2m-2d-1 respectively. Average k value of hybrid CW system for BOD5, TN, NH4-N and TP during study period were 7.0±1.8, 7.4±3.3, 5.6±4.1 and 4.9±2.0myr-1 respectively.Average concentration of TSS, TP, TN and NH4-N in the final effluent for all years were below the discharge limit value of: 150mgL-1 for TSS; 8mgL-1 for TP, 60mgL-1 for TN and NH4-N. However, average BOD5 and COD concentrations could not meet the discharge limit value of 120mgL-1 during 2007 and 2008. © 2013 Elsevier B.V.

Seasonal efficiency of a hybrid sub-surface flow constructed wetland system in treating milking parlor wastewater at northern Hokkaido
Pradeep Kumar Sharma, Inoue Takashi, Kunihiko Kato, Hidehiro Ietsugu, Kunihiko Tomita, Tetsuaki Nagasawa
Ecological Engineering, 53, 257, 266, ELSEVIER SCIENCE BV, 2013, [Peer-reviewed]
English, Scientific journal, This paper presents the effects of seasonal variations on the purification and removal efficiencies of a hybrid sub-surface CW system (VF-VF-HF) treating milking parlor wastewater at northern Hokkaido, Japan. VF(a) and VF(b) are gravel beds, each 160m2 in size whereas HF is sand bed and 336m2 in size. Daily mean air temperature at site showed a difference of 16°C between warm (May-October) and cold (November-April) periods. Average influent concentrations for cold and warm periods were: CODCr: 3749 and 4988mgL-1; BOD5: 1637 and 1395mgL-1; TSS: 661 and 862mgL-1; TN: 161 and 194mgL-1; TP: 23.9 and 31.9mgL-1 and total carbon: 1212 and 1715mgL-1. Average purification rates of BOD5, TSS, TP, PO4-P and total carbon fluctuated <2.5% between both periods. However purification rates of NH4-N and Organic-P decreased by 9.5% and 12% respectively during warm period. Average removal rates of TSS and BOD5 were unaffected between both periods, while that of CODCr, TN, total carbon increased by 3-4% during warm period. Hybrid sub-surface CW system achieved purification and removal rates of >95% for TSS and total coliform; >89% for CODCr and BOD5; >76% for TN and >72% for TP during both cold and warm periods. © 2012 Elsevier B.V..

Performance of six multi-stage hybrid wetland systems for treating high-content wastewater in the cold climate of Hokkaido, Japan
Kunihiko Kato, Takashi Inoue, Hidehiro Ietsugu, Toshinobu Koba, Hitoshi Sasaki, Naomichi Miyaji, Katsuji Kitagawa, Pradeep K. Sharma, Tetuaki Nagasawa
Ecological Engineering, 51, 256, 263, Elsevier, 2013, [Peer-reviewed]
English, Scientific journal, The performance of six multi-stage hybrid wetland systems, which were designed and constructed for treating high-content wastewater, was evaluated in the cold climate of Hokkaido, northern Japan. The systems were designed to treat four kinds of wastewater: dairy wastewater (three systems, average inflow 4.9-46.6m3d-1, average inflow content 2400-5000mgCODl-1, 2-5 years of operation); wastewater from a pig farm, including liquid food washing wastewater (one system, 4.1m3d-1, 9500mgCODl-1, 2 years of operation); wastewater from potato starch processing (one system, 5.4-13.3m3d-1, 24,000-54,000mgCODl-1, 2 years of operation); and wastewater containing pig farm swine urine (one system, 16.9m3d-1, 10,100mgCODl-1, 1 year operation). Our systems were composed of three to four vertical (V) flow beds with self-priming siphons and surface partitions and no or one horizontal (H) flow bed (total of three to five beds). In some V flow beds, treated effluents were recirculated (Vr) through the inlet to improve performance, mainly during the growing season. The total bed area was 168-2151m2. Mean annual temperature was 5-8°C at all locations. To overcome clogging due to the high load in a cold climate, we applied a safety bypass structure and floating cover material (Supersol: lightweight porous glass) to the V flow beds. The safety bypass structure and floating cover material helped to prevent clogging and freezing and maintained dry conditions and abundant growth of reeds and earthworms. The average purification rates were 70-96% for chemical oxygen demand (COD), 39-90% for total nitrogen (TN), 36-82% for NH4-N, and 70-93% for total phosphorous (TP). Calculated average oxygen transfer rates (OTRs) were 16-99gO2m-2d-1. OTRs increased in proportion to influent load, and the OTR value was Vr>V>H. Recirculating the treated effluents was expected to enhance removal of nitrogen in V flow beds mainly by a combination of nitrification and denitrification. By treating higher organic loads per area without clogging, it was possible to minimize the area and cost of treating high-content wastewater. However, more data are needed concerning load and OTR to design a more efficient multi-stage wetland system. © 2012 Elsevier B.V.

Study of Beneficiary Farmers' Evaluation on the Government-Operated Agriculture and Rural Development Project in Hokkaido
MORI Shigeru, YAMAMOTO Tadao, INOUE Takashi, NAGASAWA Tetuaki
JOURNAL OF RURAL PLANNING ASSOCIATION, 31, 375, 380, THE ASSOCIATION OF RURAL PLANNING, Nov. 2012, [Peer-reviewed]
Japanese, Scientific journal, In this study, the government-operated agriculture and rural development project in Hokkaido, Japan, has been examined based on the evaluation made by the viewpoint of beneficiary farmers of the project. The consideration for the future projects is also discussed. From the result of the questionnaire, it became clear that the beneficiary farmers are recognizing the effectiveness of the project, such as increase in income, increase in the yield, and quality improvement of the products. The farmers value the project for its low burden charge as well as its coupled correspondence between the measures and the policies. Farmers of paddy field farming and upland farming gave different results in the questionnaire. This difference seems to be a result of the disparity of the agricultural policy in both farming type.

Erratum to: Relationship between hydrology and vegetation change from Sphagnum lawns to vascular plant Sasa communities (Landscape Ecol Eng, 10.1007/s11355-011-0159-y)
Yoshiyasu Fujimura, Hiroko Fujita, Masayuki Takada, Takashi Inoue
Landscape and Ecological Engineering, 8, 2, 223, Jul. 2012
Scientific journal

Holocene Vegetation Change in Sarufutsu River Mire, Northern Hokkaido, Japan　　　　　　　　　　　　　　　
Fujita, H, Igarashi, Y, Kato, Y, Inoue, T, Takada, M
Proceedings of the 14th International Peat Congress, 3-8 June 2012, Stockholm, Sweden, 2012
English, International conference proceedings

Design and Performance of Six Hybrid Wetland Systems for High-Content Wastewater Treatment in the Cold Climate of Hokkaido, Northern Japan　　　　　　　　　　　　　　　
K. Kato, T. Inoue, H. Ietsugu, H. Sasaki, K. Kitagawa, P. K. Sharma
13th International Conference on Wetland Systems for Water Pollution Control, 24-29 November 2012, Murdoch University, Western Australia, 2012
English, International conference proceedings

Hydrological Conditions and Peat Fires in Central Kalimantan, Indonesia　　　　　　　　　　　　　　　
Takashi Inoue, Sora Sato, Ryusuke Hatano, Kiwamu Ishikura, Masayuki Takada, Hidenori Takahashi, Untung Darung, Adi Jaya, Suwido Limin
Proceedings of the 14th International Peat Congress, 3-8 June 2012, Stockholm, Sweden, 2012
English, International conference proceedings

Water quality improvement by natural meandering river surrounded by woods in agricultural watersheds　　　　　　　　　　　　　　　
Hiromu Okazawa, Tadao Yamamoto, Takashi Inoue, Tetuaki Nagasawa
International Journal of Environmental and Rural Development, 3, 1, 137, 143, 2012, [Peer-reviewed]
English, Scientific journal

Relationship between hydrology and vegetation change from Sphagnum lawns to vascular plant Sasa communities
Fujimura Yoshiyasu, Fujita Hiroko, Takada Masayuki, Inoue Takashi
Landscape and Ecological Engineering, 8, 2, 215, 221, Springer Japan, 2012, [Peer-reviewed]
English, Scientific journal, We examined the relationship between fluctuation patterns of groundwater levels (WL) and the distribution dynamics of the vascular plant Sasa palmata, in Sarobetsu Mire, northern Japan. WLs were recorded at 30 stations: 11 Sphagnum lawns, which is the original vegetation type in the area, nine Sasa communities, and ten boundary stations between those two areas. The ten boundary stations were composed of five vegetation change sites and five stable sites, categorized using maps of Sasa distribution in 1977 and 2000. The results showed that Sphagnum lawns and Sasa communities significantly differed in the average, minimum, and fluctuation range of WLs, and increases in WL after rain events. The differences between change sites and stable sites were not significant in the average WL, but were significant in the minimum and fluctuation ranges of WL and the increase in WL after rain events. These results indicate that the distribution dynamics of Sasa communities would be regulated by groundwater flow that was affected by drainage and inflow condition rather than merely groundwater drawdown as suggested in previous studies. The WL regimes at two Sphagnum lawns were similar to those at change sites, suggesting that Sasa may expand into these two stations more readily than the other Sphagnum lawn stations. © 2011 International Consortium of Landscape and Ecological Engineering and Springer.

Geographical assessment of factors for Sasa expansion in the Sarobetsu Mire, Japan　　　　　　　　　　　　　　　
Masayuki Takada, Takashi Inoue, Yoshio Mishima, Hiroko Fujita, Takashi Hirano, Yoshiyasu Fujimura
Journal of Landscape Ecology, 5, 1, 58, 71, 2012, [Peer-reviewed]
Japanese, Scientific journal

Evaluations of the groundwater level lowering in ombrotrophic mire
TAKADA MASAYUKI, INOUE TAKASHI
Proceeding of Annual Conference, 24, 90, 90, THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2011
Japanese, 高層湿原における生物多様性劣化の予兆を検知する指標として、比較的簡易に計測可能な地下水位データを用いて、その低下傾向の有無を評価する手法について検討した。4箇所の湿原を対象に連続観測した地下水位から、_丸1_地下水位の統計値、_丸2_比産出率、_丸3_雨量補正した貯水量、_丸4_地点間の水位差、の4方法で評価を試みた。その結果、雨量補正した貯水量及び地点間の水位差が、各年の降水量の多寡の影響を受けにくい傾向が示されたとともに、特に地点間の水位差を追跡することが、潜在的な環境変化を検知する上で有効な手法である可能性が示された。総じて、ひとつの指標に必ずしも依らず、直感性、土壌の空隙との関連、雨量の多寡の考慮など、それぞれの特性を生かして多角的視点から中期的な環境変動を評価することが適切であると考えられる。

Performance of six real-scale hybrid wetland systems for treating high content wastewater in cold climates in Japan　　　　　　　　　　　　　　　
Kunihiko Kato, Takashi Inoue, Hidehiro Ietsugu, Takashi Yokota, Hitoshi Sasaki, Naomichi Miyaji, Katsuji Kitagawa
Book of abstracts, Joint Meeting of Society of Wetland Scientists, WETPOL and Wetland Biogeochemistry Symposium, 3-8 July 2011, Prague, Czech Republic, 153, 154, 2011
English, International conference proceedings

北海道北部猿払川中流域における遺存種ムセンスゲが生育する湿原の植生と微地形　　　　　　　　　　　　　　　
加藤ゆき恵, 冨士田裕子, 井上京
植生学会誌, 28, 13, 37, 2011, [Peer-reviewed]
Japanese, Scientific journal

Evaluation of the Comprehensive Hokkaido Development Plan and Land Improvement Projectin Hokkaido : The Case of Government-operated Land Improvement Project
森繁, 山本忠男, 井上京, 長澤徹明
農村計画学会誌論文特集号, 30, 327, 332, 農村計画学会, 2011, [Peer-reviewed]
Japanese, Scientific journal

浄化槽三次処理と面源負荷処理を目的としたハイブリッド伏流式人工湿地の初期性能　　　　　　　　　　　　　　　
井上京, 櫻木宏明, 加藤邦彦, 横田岳史, 千田智基, 家次秀浩, P. K. Sharma
農業農村工学会資源循環研究部会論文集, 7, 21, 26, 2011, [Peer-reviewed]
Japanese, Symposium

Potential of hybrid constructed wetland system in treating milking parlor wastewater under cold climatic conditions in northern Hokkaido, Japan
P. K. Sharma, T. Inoue, K. Kato, H. Ietsugu, K. Tomita, T. Nagasawa
Water Practice and Technology, 6, 3, IWA Publishing, 2011, [Peer-reviewed]
English, Scientific journal, A real scale hybrid constructed wetland (CW) system (656 m2), with a configuration of VFA-VFB-HF beds constructed in series is operating since November 2006 in northern Hokkaido, Japan. The system was experimented to assess its capability in purifying 4.5 m3d−1 of high strength milking parlor wastewater under colder climate. Annual mean air temperature at site was recorded as 6.4 oC (extremes vary as -22.8 oC at lowest and 30.6 oC at highest). From the monthly sampling from November 2006 to January 2010, average loading and removal rates of TSS, CODcr, BOD5, TN and TP were 5.4 g m−2 d−1 (98%), 30.3 g m−2 d−1 (88%), 11.5 g m 2 d−1 (89%), 1.2 g m−2 d−1 (76.4%) and 0.2 g m−2 d−1 (76%). System did not stop for a single day, efficiently worked even during snow covered periods and was tolerant to the load fluctuations.

Microclimate of Developed Peatland of the Mega Rice Project in Central Kalimantan　　　　　　　　　　　　　　　
Adi Jaya, Takashi Inoue, Suwido Hester Limin, Untung Darung, Irwan Sukri Banuwa
Journal of Tropical Soils, 15, 1, 63, 71, 2010, [Peer-reviewed]
English, Scientific journal

Subsidence of tropical peatland and its relation with hydrological condition　　　　　　　　　　　　　　　
Takashi Inoue, Sora Sato, Ryusuke Hatano, Untung Darung, Adi Jaya, Suwido Limin
International Symposium on Forest Monitoring Methodologies for Addressing Climate Change Using ALOS/PALSAR, 9‐10 November 2010, Bogor, Indonesia, 2010
English, International conference proceedings

Potential of hybrid constructed wetland system in treating milking parlor wastewater under cold climatic conditions in northern Hokkaido, Japan　　　　　　　　　　　　　　　
P.K. Sharma, T. Inoue, K. Kato, H. Ietsugu, K. Tomita, T. Nagasawa
Proceedings of 12th International Conference on Wetland Systems for Water Pollution Control October 4 – 8, 2010, Venice, 929, 938, 2010
English, International conference proceedings

Design and performance of hybrid reed bed systems for treating high content wastewater in the cold climate
K. Kato, T. Inoue, H. Ietsugu, T. Koba, H. Sasaki, N. Miyaji, T. Yokota, P. K. Sharma, K. Kitagawa, T. Nagasawa
Proceedings of 12th International Conference on Wetland Systems for Water Pollution Control October 4 – 8, 2010, Venice, 12, 511, 517, 2010
English, International conference proceedings

泥炭の水文特性を反映した地下水流動モデル　　　　　　　　　　　　　　　
岡田 操, 井上 京
湿地研究, 1, 1, 1, 12, 2010, [Peer-reviewed]
Japanese, Scientific journal

Estimation of evapotranspiration from hydrological fluctuation in peatlands
TAKADA Masayuki, HIRANO Takashi, INOUE Takashi
Proceeding of Annual Conference, 22, 21, 21, THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2009
Japanese, 泥炭地湿原である北海道サロベツ湿原を対象に、植生の異なる２地点で地下水位及び土壌水分変動より算出した蒸発散量と、渦相関法による観測結果とを比較し、両者の定量的な関係について分析した。その結果、いずれの地点ともに概ね1:1の関係が得られたものの、ミズゴケ地点では全体に水文変動による推定値が過小評価となった。また渦相関法による観測値を真値と仮定して偏差の原因を考察した結果、両地点ともに渦相関法による1日当たりの蒸発散量が大きいほど、また地下水位が低いほど偏差が大きいことが示された。以上より、泥炭地湿原において、地下水位及び土壌水分変動より蒸発散量を一定精度で定量的に推定できる可能性が示された。

An inventory of the mires of Hokkaido, Japan—their development, classification, decline, and conservation
Hiroko Fujita, Yaeko Igarashi, Stefan Hotes, Masayuki Takada, Takashi Inoue, Masami Kaneko
Plant Ecology, 200, 1, 9, 36, Springer Science and Business Media LLC, Jan. 2009, [Peer-reviewed]
English, Hokkaido Island is located in the cool temperate zone, and its climate conditions facilitated the formation of a variety of wetland types, the majority of them peat-forming mires. Most of these remained in a natural state until the early 20th century. However, drainage and subsequent conversion mostly to agricultural land have since destroyed more than 70% of the original wetland ecosystems. This paper (1) provides an overview of mire types, (2) reviews the development process of mires in Hokkaido during the Holocene, (3) analyzes the causes of losses of wetland areas, and (4) gives a summary of the current conservation and management status. Basic mire types that have been described in other parts of the northern hemisphere can also be recognized in Hokkaido, although there are floristic differences, and the frequency and intensity of volcanic impact and tsunamis is higher than in most other regions with abundant mire formation. Mire formation started at various points during the postglacial period; a few mountain mires in southwest Hokkaido date back to the Lateglacial, but most mountain mires formed during the mid to late Holocene. Most lowland mires developed at altitudes below 20 m and were influenced by the Jomon transgression that peaked ca. 6,000 years BP. The largest lowland mires started forming after the sea retreated, and many are not older than ca. 3,000 years. In 1996, the total number of wetlands (including peat-forming mires, freshwater marshes, and saltmarshes) greater than 1 ha was 150, with a total area of 59,881 ha. In 1928, when many wetlands were yet undeveloped, their total area was 200,642 ha. Most losses occurred between the 1950s and 1970s, when post-war development economics promoted agriculture and large-scale reclamation projects. Currently, 90.7% of mountain wetlands are public land, while 81.3% of the lowland wetlands are private or in mixed ownership. The ownership condition affects the possibilities for the protection of complete mire complexes especially in the lowlands. For effective conservation of wetland ecosystems it is necessary to include the catchment area in the planning of protected areas. © 2007 Springer Science+Business Media, Inc.

Controls on the Carbon Balance of Tropical Peatlands
Takashi Hirano, Jyrki Jauhiainen, Takashi Inoue, Hidenori Takahashi
Ecosystems, 12, 6, 873, 887, 2009, [Peer-reviewed]
English, Scientific journal, The carbon balance of tropical peatlands was investigated using measurements of gaseous fluxes of carbon dioxide (CO2) and methane (CH4) at several land-use types, including nondrained forest (NDF), drained forest (DF), drained regenerating forest (DRF) after clear cutting and agricultural land (AL) in Central Kalimantan, Indonesia. Soil greenhouse gas fluxes depended on land-use, water level (WL), microtopography, temperature and vegetation physiology, among which WL was the strongest driver. All sites were CH4 sources on an annual basis and the emissions were higher in sites providing fresh litter deposition and water logged conditions. Soil CO 2 flux increased exponentially with soil temperature (T s) even within an amplitude of 4-5°C. In the NDF soil CO2 flux sharply decreased when WLs rose above -0.2 and 0.1 m for hollows and hummocks, respectively. The sharp decrease suggests that the contribution of surface soil respiration (RS) to total soil CO2 flux is large. In the DF soil CO2 flux increased as WL decreased below -0.7 m probably because the fast aerobic decomposition continued in lower peat. Such an increase in CO 2 flux at low WLs was also found at the stand level of the DF. Soil CO2 flux showed diurnal variation with a peak in the daytime, which would be caused by the circadian rhythm of root respiration. Among the land-use types, annual soil CO2 flux was the largest in the DRF and the smallest in the AL. Overall, the global warming potential (GWP) of CO 2 emissions in these land-use types was much larger than that of CH4 fluxes. © 2008 Springer Science+Business Media, LLC.

ALOS/PALSARを用いた泥炭地湿原の表層土壌特性の推定　　　　　　　　　　　　　　　
高田雅之, 井上 京, 谷 宏
農業農村工学会論文集, 258, 57, 63, 2008, [Peer-reviewed]
Japanese, Scientific journal

Design and performance of hybrid wetland system for dairy wastewater treatment in eastern Hokkaido, Japan　　　　　　　　　　　　　　　
Kunihiko Kato, Toshinobu Koba, Hidehiro Ietsugu, Saori Tsunoda, Takashi Inoue, Sohei Kobayashi, Katsuji Kitagawa, Shuji Yanagiya, Naomichi Miyaji, Tetuaki Nagasawa
11th International Conference on Wetland Systems for Water Pollution Control, 01-07 November 2008, Indore, India, 2008
English, International conference proceedings

Performance evaluation of hybrid reed bed system to treat milking parlor waste water under cold climate conditions in northern Hokkaido, Japan　　　　　　　　　　　　　　　
Pradeep K. Sharma, Takashi Inoue, Kunihiko Kato, Ikuya Yoshitomo, Hidehiro Ietsugu, Kunihiko Tomita, Tetuaki Nagasawa
11th International Conference on Wetland Systems for Water Pollution Control, 01-07 November 2008, Indore, India, 2008
English, International conference proceedings

Microclimate Conditions of the Developed Peatland in Central Kalimantan
Yetrie Ludang, Adi Jaya, Takashi Inoue
Journal of Applied Sciences, 7, 18, 2604, 2609, 2007, [Peer-reviewed]
English, Scientific journal, This study describes temperature and soil moisture profile of peatland for four land uses condition: Agricultural area, forest, regrowing forest and destroyed forest. The study area covers the former Mega Rice Project (1996-1999) with an area of 1.5 million ha in central Kalimantan, Indonesia. Daily and hourly temperatures and soil moisture content were observed during dry (July-August) and rainy (March) seasons for two years. Results of this study reveal that the developed peatland increases peat surface and air temperatures ranging from 1.09 to 2.97°C. Daily and diurnal temperature fluctuations ranging from 2.25 to 5.55°C affected significantly the decreasing of 11.65% soil moisture content within the top peat layer of 20 cm. This findings offer possible restoration options in order to control hydrogeological change within the study area. © 2007 Asian Network for Scientific Information.

Geohydrological Conditions of the Developed Peatland in Central Kalimantan　　　　　　　　　　　　　　　
Yetrie Ludang, Adi Jaya, Takashi Inoue
World Applied Sciences Journal, 2, 3, 198, 203, 2007, [Peer-reviewed]
English, Scientific journal

ハイブリッド伏流式人工湿地による酪農排水の浄化と飼料用稲の栽培による資源リサイクルの可能性について　　　　　　　　　　　　　　　
井上京, 吉友郁哉, 加藤邦彦, 家次秀浩, 野々村正樹, 富田邦彦, 長澤徹明, 関根基, 清水博之
農業農村工学会資源循環研究部会論文集, 3, 37, 45, 2007, [Peer-reviewed]
Japanese, Symposium

First Year Performance of a Real-Scale Hybrid Wetland System for the Treatment of Dairy Wastewater in a Cold Climate in Japan　　　　　　　　　　　　　　　
Kunihiko Kato, Toshinobu Koba, Hidehiro Ietsugu, Toshiya Saigusa, Shuji Yanagiya, Takashi Inoue, Katsuji Kitagawa, Sohei Kobayashi
International Symposium on Wetland Pollutant Dynamics and Control (WETPOL), Tartu, Estonia, 1, 150, 152, 2007
English, International conference proceedings

Effect of hydrological restoration on soil carbon fluxes at degraded tropical peat　　　　　　　　　　　　　　　
Jauhiainen J, Limin S, Inoue T, Silvennoinen H, Vasander H
Proceedings of 5th European Conference on Ecological Restoration, Greifswald, Germany, 24th August 2006, 2007
English, International conference proceedings

Greenhouse Gas Fluxes from Three Ecosystems in Tropical Peatland of Sarawak, Malaysia　　　　　　　　　　　　　　　
Lulie Melling, Ryusuke Hatano, Kah Joo Goh, Takashi Inoue
Proceedings of the 18th World Congress of Soil Science, Philadelphia, Pennsylvania, USA, July 9-15, 2006
English, International conference proceedings

Water chemistry gradient in a degraded bog area　　　　　　　　　　　　　　　
R. Iqbal, S. Akimoto, K. Tokutake, T. Inoue, H. Tachibana
Water Science and Technology, 53, 2, 63, 71, 2006, [Peer-reviewed]
English, Scientific journal

Vegetation, hydrological conditions and conservation of Shinoro Mire, an isolated peatland in Sapporo, northern Japan
FUJITA Hiroko, INOUE Takashi
Vegetation Science, 22, 2, 113, 133, The Society of Vegetation Science, 2005, [Peer-reviewed]
Japanese, Scientific journal, We investigated vegetation, ground water level and fluctuation, topography, peat accumulation and vegetation changes of Shinoro Mire, an isolated peatland remnant of Ishikari Mire, once the largest mire in Japan. Many pools and drainage ditches have been dug in the mire, which is surrounded by asphalt roads, landfilled areas and drainage ditches. We classified vegetation into five herbaceous communities (Moliniopsis japonica-Sphagnum comm.; Phragmites australis comm.; Moliniopsis japonica comm.; Sasa comm.; and Miscanthus sinensis・Sasa comm.) and one forest community (Betula platyphylla var. japonica・Alnus japonica comm.). Vegetation changes were rapidly progressing as a result of drainage. It was observed by aerial photography Moliniopsis japonica-Sphagnum community had formed where the surface peat have been removed. Topographic survey indicates that there are a few places with lateral flow, a result of banking or landfilling. The water level was high in fall, winter and early spring snowmelt season. In the summer season it was lower and its fluctuation was much greater. Consequently the peat from the ground surface to 50cm depth was in a state of decomposition. These results show that the mire environment is threatened and mire is in danger of being lost.

森林流域と農業流域における融雪流出時の汚濁負荷流出特性　　　　　　　　　　　　　　　
岡澤 宏, 長澤徹明, 井上 京, 山本忠男, 鵜木啓二
農業土木学会論文集, 237, 57, 65, 2005, [Peer-reviewed]
Japanese, Scientific journal

Estimations of Soil Moisture for Bare Soil Fields using a Soil Line derived from Satellite Data
Xiufeng Wang, Takashi Inoue
Journal of Environmental Information Science, 33, 5, 1, 12, 環境情報科学センター, 2005, [Peer-reviewed]
Japanese, Scientific journal

Reed die-back related to increased sulfide concentration in a coastal mire in eastern Hokkaido, Japan　　　　　　　　　　　　　　　
Stefan Hotes, Erwin B. Adema, Ab P. Grootjans, Takashi Inoue, Peter Poschlod
Wetlands Ecology and Management, 13, 83, 91, 2005, [Peer-reviewed]
English, Scientific journal

北海道南西部の草地畜産流域における河川水文と汚濁負荷流出特性
岡澤宏, 長澤徹明, 井上京, 山本忠男
農業土木学会論文集, 240, 603, 610, 2005, [Peer-reviewed]
Japanese, Scientific journal

石狩川河跡湖周辺地域の土地利用と湖水環境　　　　　　　　　　　　　　　
山本忠男, 神戸敏光, 長澤徹明, 井上 京
農村計画論文集, 6, 62, 72, 2004, [Peer-reviewed]
Japanese, Scientific journal

Hydrological Characteristics of Bogs in heavy Snow and Lowland Areas in Hokkaido, Japan　　　　　　　　　　　　　　　
Masayuki Takada, Hidenori Takahashi, Takashi Inoue
Proceedings of the 12th International Peat Congress, Tampere, Finland, 6-11 June 2004, 1162, 1167, 2004
English, International conference proceedings

Environmental Changes Caused by Development of Peatland Landscapes in Central Kalimantan, Indonesia　　　　　　　　　　　　　　　
Adi Jaya, Takashi Inoue, J.O. Rieley, Suwido Limin
Proceedings of the 12th International Peat Congress, Tampere, Finland, 6-11 June 2004, 660, 667, 2004
English, International conference proceedings

Carbon Balance in Managed Tropical Peat in Central Kalimantan, Indonesia　　　　　　　　　　　　　　　
Jyrki Jauhiainen, Harri Vasander, Adi Jaya, Takashi Inoue, Juha Heikkinen, Pertti Martikainen
Proceedings of the 12th International Peat Congress, Tampere, Finland, 6-11 June 2004, 660, 659, 2004
English, International conference proceedings

Characteristics of Stream Water Quality during Rainfall Runoff on an Upland Field Area of Eastern Hokkaido, Japan
OKAZAWA Hiromu, INOUE Takashi, YAMAMOTO Tadao, NAGASAWA Tetuaki, UNOKI Keiji
農業土木学会論文集, 227, 5, 593, 600, 農業土木学会, Oct. 2003, [Peer-reviewed]
Japanese, Scientific journal

少雪寒冷な酪農流域における融雪融凍期の水質水文環境
鵜木啓二, 山本忠男, 井上 京, 長澤徹明, 岡澤 宏
農業土木学会論文集, 228, 9, 15, 2003, [Peer-reviewed]
Japanese, Scientific journal

Irrigation Scheduling of Aflaj of Oman: Methods and its Modernization　　　　　　　　　　　　　　　
Abdullah S. Al-Ghafri, Takashi Inoue, Tetuaki Nagasawa
UNU-UNESCO-ICARDA Joint International Workshop on “Sustainable Management of Marginal Drylands”, 21-25 September 2002, Alexandria, Egypt, 2002
English, International conference proceedings

Effect of Lake Utilization and Watershed Agricultural Landuse on Water Quality in Oxbow Lakes of Ishikari River Basin.
YAMAMOTO Tadao, NAGASAWA Tetuaki, INOUE Takashi
JOURNAL OF RURAL PLANNING ASSOCIATION, 4, 157, 162, THE ASSOCIATION OF RURAL PLANNING, 2002, [Peer-reviewed]
Japanese, Scientific journal, Water quality of oxbow lakes in middle and lower reaches of Ishikari river basin, Hokkaido, was investigated with special notice to the Ianduse of their surroundings and the form of usage of water in oxbow lake itself. Water quality of oxbow lake during irrigation period of rice paddy was in good condition. Water quality was also good where its water is utilized as source of irrigation. However, with the increase of upland farming in the watershed, the water quality degraded. It is suggested that the irrigation use of water of oxbow lake will sustain the good condition of water quality, so that the conservation of oxbow lake as one of the important element of rural resources must focus on relation with surrounding agricultural activity.

Relationship between Water Quality Environment and Landuse in an Agricultural Watershed during Snowmelt Period : Principal Component Analysis of River Water Quality
UNOKI Keiji, NAGASAWA Tetuaki, INOUE Takashi, YAMAMOTO Tadao
Journal of Japan Society of Hydrology & Water Resources, 15, 4, 391, 398, 水文・水資源学会, 2002, [Peer-reviewed]
Japanese, Scientific journal

篠津地域にみる泥炭地の利用と保全　　　　　　　　　　　　　　　
神谷光彦, 井上 京
農業土木学会誌, 70, 4, 43, 46, 2002
Japanese, Scientific journal

Effect of Previous Flood on Suspended Sediment Transport during Rainstorm Runoff　　　　　　　　　　　　　　　
Okazawa Hiromu, Nagasawa Tetuaki, Inoue Takashi, Yamamoto Tadao
Proceedings of 12th International Soil Conservation Organization Conference, May 26-31, 2002, Beijing, China, 26, 32, 2002
English, International conference proceedings

The Principal Component Analysis of River Water Quality during Snowmelt Period at the Agricultural Basin in Hokkaido, Northern Japan　　　　　　　　　　　　　　　
Yamamoto, T, Nagasawa, T, Inoue, T, Unoki, K
Abstract book of the Conference on Management of Northern River Basins, 6th-8th June 2001, Oulu, Finland, 2001
English, International conference proceedings

Characteristics of Nitrogen Discharge during Snowmelt Period at the Agricultural Basin in Hokkaido, Northern Japan　　　　　　　　　　　　　　　
Nagasawa, T, Inoue, T, Yamamoto, T, Unoki, K
Abstract book of the Conference on Management of Northern River Basins, 6th-8th June 2001, Oulu, Finland, 2001
English, International conference proceedings

Evaluation of Oxbow Lake for Rural Resource from its Flood Control Function in Ishikari River Basin
KUSA Daisuke, YAMAMOTO Tadao, NAGASAWA Tetuaki, INOUE Takashi
Journal of Rural Planning Association, 3, 67, 72, 農村計画学会, 2001, [Peer-reviewed]
Japanese, Scientific journal, Objective of this study is to clarify the functions of oxbow lakes as one of regional resources in rural area. The present status of oxbow lakes has been briefly investigated through interviews from town officers and farmer's water users association. It became clear that most of oxbow lakes in Ishikari river basin are utilized as source and reservoir of irrigation water, parks for recreational use, and retarding pond for flood prevention. etc. In this paper, the flood control function of oxbow lake is high lightened, by quantitative evaluation of simulation model. It is recommended that the various functions of oxbow lake should be evaluated widely ndd effectively utilized as one of valuable regional resources.

Evaluation of Oxbow Lakes in Ishikari River Basin for its Function of Water Quality Conservation
YAMAMOTO Tadao, NAGASAWA Tetuaki, INOUE Takashi, KUSA Daisuke
Journal of Rural Planning Association, 3, 49, 54, 農村計画学会, 2001, [Peer-reviewed]
Japanese, Scientific journal, In this paper, the function of water quality conservation by oxbow lakes in Ishikari River basin was evaluated. Many oxbow lakes of Ishikari River basin have been utilized as part of water resource and reservoir of irrigation water for agriculture, especially for circular reuse of irrigation water. Semi-closed oxbow lake that has no outlet to Ishikari River accumulates the load from catchment area in its body, which means effluent load to Ishikari River has been cut. The function of load reduction by oxbow lake that has outlet to Ishikari River was also evaluated from balance calculation. More than 50% and 70% of T-N was reduced by oxbow lake during puddling period and normal period, respectively.

Characteristics of Nitrogen Runoff During Snowmelt Period in Agricultural Watershed River
UNOKI Keiji, NAGASAWA Tetsuaki, INOUE Takashi, YAMAMOTO Tadao
Journal of Japan Society of Hydrology & Water Resources, 14, 6, 452, 460, 水文・水資源学会, 2001, [Peer-reviewed]
Japanese, Scientific journal

Vegetation, hydrology, and development of a coastal mire in Hokkaido, Japan, affected by flooding and tephra deposition
Stefan Hotes, Peter Poschlod, Hiroshige Sakai, Takashi Inoue
Canadian Journal of Botany, 79, 3, 341, 361, 2001, [Peer-reviewed]
Japanese, Scientific journal, Mires in coastal lowlands in Hokkaido, northern Japan, have repeatedly been affected by flooding events and tephra (aerially transported volcanic ejecta) deposition during their development. Vegetation, hydrology, and stratigraphy of Kiritappu Mire in eastern Hokkaido were investigated along two transects and are discussed in relation to disturbance by mineral deposition. The vegetation pattern showed little relation to past geologic events. Five plant communities, two of which (A and C) could be further divided into subgroups, were distinguished (A, Alnus japonica - Spiraea salicifolia community; B, Sasa chartacea community; C, Myrica gale var. tomentosa - Sphagnum fuscum community; D, Carex lyngbyei community; E, Carex subspathacea - Aster tripolium community). Water levels, pH, electric conductivity, and ionic composition of groundwater and surface water were measured in communities A-C. Mean water levels were similar in communities A and C; in community B, it was lower. The pH was higher in community A than in communities B and C. Ion concentrations were influenced by sea water at some sites. Plant macrofossils and ash contents of 31 cores were analysed. Sedge roots were the dominant peat component, often mixed with remains of Phragmites australis, Sphagnum spp., and Polytrichum juniperinum var. strictum. Ash contents were high, and up to nine different mineral layers consisting of tephra, sand, silt, and clay were detected. In some cases, mineral deposition induced changes in the macrofossil composition of the peat. However, in a greater number of cases, no changes in the macrofossil composition were found at the mineral layers, and most shifts were not related to mineral deposition.

農業水利機能等を有した河跡湖の地域資源的評価 −石狩川本流中下流域の事例−
長澤徹明, 井上 京, 山本忠男, 草 大輔
農業土木北海道, 23, 31, 41, 2001
Japanese, Scientific journal

River Water Quality During Rainstorm Runoff on Agricultural and Forested Watersheds of Southwestern Hokkaido, Japan
OKAZAWA Hiromu, NAGASAWA Tetuaki, INOUE Takashi, YAMAMOTO Tadao
Transactions of the Agricultural Engineering Society,Japan, 211, 1, 35, 42, 農業土木学会, 2001, [Peer-reviewed]
Japanese, Scientific journal

農業流域における自然河川のSS流送挙動　　　　　　　　　　　　　　　
岡澤 宏, 山本忠男, 井上 京, 長澤徹明
応用水文, 13, 29, 34, 2000
Japanese, Scientific journal

Aflaj Irrigation System of Oman, The Way of Water Distribution　　　　　　　　　　　　　　　
Abdullah S. Al-Ghafri, Takashi Inoue, Tetuaki Nagasawa
Proceedings of the XIV Memorial CIGR World Congress 2000, Tsukuba, Japan, 28 Nov. - 1 Dec. 2000, 1128, 1133, 2000
English, International conference proceedings

Traditional Irrigation Scheduling in Aflaj Irrigation System of Oman, Case Study of Falaj Al-Hajeer, Northern Oman　　　　　　　　　　　　　　　
Abdullah S. Al-Ghafri, Takashi Inoue, W. Ray Norman, Tetuaki Nagasawa
Proceedings of the First International Symposium on Qanat, Yazd, Iran, 8-11 May 2000, IV, 37, 43, 2000
English, International conference proceedings

Characteristics of River Water Quality of Agricultural Watershed with Complex Landuse in Hokkaido, Japan.
INOUE Takashi, MUNEOKA Toshimi, UNOKI Keiji, YAMAMOTO Tadao, NAGASAWA Tetuaki
JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 13, 5, 347, 354, THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2000, [Peer-reviewed], [Lead author]
Japanese, Scientific journal, River water quality under normal flow conditions was investigated on two watersheds with complex agricultural landuse in Hokkaido, Japan. The main forms of agriculture are upland farming and livestock farming. If all livestock manure is composted and returned to the field, its amount will exceed the required amount of fertilizer in both watersheds. The excess fertilizer may therefore cause water quality degradation. It is highly probably that the location of livestock yards and riverbank landuse strongly influenced the discharge rate of livestock manure generated in the watershed to the river. The river water quality in the watershed, including rice paddies, showed apparent influences of irrigation water. During the irrigation period, the concentration of nitrogen and phosphorus of the river water itself was diluted and lowered by irrigation water. However, the output of the load of total nitrogen from the rice paddy was larger than the input, because of the good quality of irrigation water.

降雨時における浮流土砂流送挙動 −農林地流域河川の浮流土砂流送に関する研究(1)−　　　　　　　　　　　　　　　
長澤徹明, 井上 京, 横山慎司
農業土木学会論文集, 208, 1, 6, 2000, [Peer-reviewed]
Japanese, Scientific journal

Discussion on Rural Development of Peat Swamp Area of Central Kalimantan from Hydrological Aspect　　　　　　　　　　　　　　　
Takashi Inoue
Proceedings of the International Symposium on: Tropical Peatlands, Bogor, Indonesia, 22-23 November 1999, 145, 149, 2000, [Lead author]
English, International conference proceedings

北海道の酪農流域河川における窒素流出と水質保全　　　　　　　　　　　　　　　
宗岡寿美, 長澤徹明, 井上 京, 山本忠男
農業土木学会誌, 68, 3, 217, 220, 2000, [Peer-reviewed]
Japanese, Scientific journal

北海道東部浜中地区における流域の土地利用と河川水質
井上 京, 山本 忠男, 長澤 徹明
農業土木学会論文集, 200, 85, 92, 農業土木学会, Apr. 1999, [Peer-reviewed]
Japanese, Scientific journal

石狩川流域の泥炭地水田地域における圃場区画形状の変遷　　　　　　　　　　　　　　　
山本忠男, 井上 京, 長澤徹明, 森下達士
農業土木学会論文集, 199, 35, 44, 1999, [Peer-reviewed]
Japanese, Scientific journal

Effect of the Invasion of Vascular Plants on Heat and Water Balance in the Sarobetsu Mire, Northern Japan
Kentaro Takagi, Taro Tsuboya, Hidenori Takahashi, Takashi Inoue
Wetlands, 19, 1, 246, 254, 1999, [Peer-reviewed]
English, Scientific journal, To assess the effect of the invasion of vascular plants on the heat and water balance in a Sphagnum bog, evapotranspiration was compared throughout a growing season in the Sphagnum bog and in the adjoining transition peatland where vascular plants completely cover the ground surface in the Sarobetsu mire, northern Japan. Cumulative evapotranspiration over 152 days was 372 mm in the transition peatland and 285 mm in the bog, with the differences between the sites becoming clear from mid-August. Therefore, we consider the invasion of the vascular plants into the Sphagnum bog to accelerate water consumption. However, levels of evapotranspiration in mid-summer did not differ greatly between the sites. In mid-summer, the ratio of latent heat flux to net radiation decreased in the transition peatland on days when humidity deficit was large, although, in the bog, the ratio showed a large value in those days. We attribute the decrease in the ratio to stomatal closure with the increase in humidity deficit. We also conclude that the invading vascular plants developed a negative feedback mechanism of stomatal response to the humidity deficit of the ambient air in mid-summer.

サロベツ湿原のササ群落とミズゴケ群落の蒸発散特性 −植物個体の気孔制御の視点から−
高木健太郎, 坪谷太郎, 井上 京, 高橋英紀
北方林業, 51, 8, 185, 189, 北方林業会, 1999, [Peer-reviewed]
Japanese, Scientific journal

時間降雨を考慮した河川汚濁負荷量の推定
井上 京, 山本忠男, 岡澤 宏, 長澤徹明
応用水文, 11, 70, 75, 1998
Japanese, Symposium

標津湿原の発達過程と植生
橘ヒサ子, 井上 京, 新庄久志
北海道の湿原の変遷と現状の解析 −湿原の保護を進めるために−, 151, 170, 自然保護助成基金, 1997
Japanese, Research society

別寒辺牛泥炭地にみる低地泥炭湿原の水文環境と形成過程　　　　　　　　　　　　　　　
井上 京
北海道の湿原の変遷と現状の解析 −湿原の保護を進めるために−, 41, 47, 1997
Japanese, Research society

水田水利用による水質環境への影響 −北海道における調査事例−　　　　　　　　　　　　　　　
長澤徹明, 井上 京, 梅田安治, 宗岡寿美, 山本忠男
水文・水資源学会誌, 10, 5, 477, 484, 1997, [Peer-reviewed]
Japanese, Scientific journal

積雪寒冷地の農業流域における融雪期の河川水質水文　　　　　　　　　　　　　　　
井上 京
応用水文, 9, 23, 28, 1996
Japanese, Symposium

River Water Quality of Dairy Farming Area in Eastern Hokkaido
NAGASAWA Tetuaki, INOUE Takashi, UMEDA Yasuharu, MUNEOKA Toshimi
JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 8, 3, 267, 274, THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 1995, [Peer-reviewed]
Japanese, Scientific journal, The present state of river water quality of dairy farming area in eastern part of Hokkaido, Japan, was studied. From standpoint of water environment conservation, some consideration was made to the landuse as it ought to be. River water concentrations of 5 river basins show following tendency; [Forest basin with natural river channel] < < [Dairy farming basin with natural river channel] < [Dairy farming basin with artificial river channel]. It is remarkable that 80% of total nitrogen take form of NO3-N in dairy farming basins, and that the concentration is higher in basin of large cattle population density per pasture, which suggests the apparent evidence of NO3-N eluviation. Densely populated basin of cattle also shows severe water pollution in relation between river flow and concentration. Artificial river channel indicates higher concentration than that of natural river channel on same level density of cattle population. The function of riparian forest and wetland zones as buffer filter is confirmed. From the fact mentioned above, development of river basin and enlargement of farm keeping give impact not only by scale and condition of farm management, but also influences by the condition of river channel and landuse of the basin. The concept about direction of river environment conservation was mentioned using two axes correspond to input and output of load.

北海道における泥炭地湿原の保全対策　　　　　　　　　　　　　　　
梅田安治, 井上 京
農業土木学会誌, 63, 3, 249, 254, 1995, [Peer-reviewed]
Japanese, Scientific journal

傾斜畑における営農と土壌保全問題
長澤徹明, 梅田安治, 井上 京, 宗岡寿美
土壌の物理性, 71, 47, 51, 1995, [Peer-reviewed]
Japanese, Scientific journal

Peat forming process of low-lying peatland evaluated from ash content of peat　　　　　　　　　　　　　　　
Takashi Inoue, Yasuharu Umeda
International Conference '94 on Wetland Environment and Peatland Utilization, Changchun Institute of Geography, the Chinese Academy of Sciences, 10, 1994
English, International conference proceedings

Control of groundwater conditions on Sasa-occupied bog　　　　　　　　　　　　　　　
Yasuharu Umeda, Takashi Inoue, Tatsuichi Tsujii, Masao Shimizu
Peatland Ecosystems and Man: An Impact Assessment., International Peat Society, 374, 1992
English, Symposium

Fluctuations of groundwater level in peatland　　　　　　　　　　　　　　　
Yasuharu Umeda, Takashi Inoue
Tropical Peat: Proceedings of the International Symposium on Tropical Peatland., Malaysian Agricultural Research and Development Institute, 205, 217, 1992
English, International conference proceedings

Paddy field reclamation of peatland in Hokkaido, Japan　　　　　　　　　　　　　　　
Yasuharu Umeda, Kimio Hayashi, Takashi Inoue
Tropical Peat: Proceedings of the International Symposium on Tropical Peatland., Malaysian Agricultural Research and Development Institute, 190, 193, 1992
English, International conference proceedings

Some Experiments Restoring Hydrological Condition of Peatland in Hokkaido, Japan
Takashi Inoue, Yasuharu Umeda, Tetuaki Nagasawa
Land Reclamation: Advances in Research and Technology., American Society of Agricultural Engineers., 196, 203, 1992, [Lead author]
English, International conference proceedings

Characteristics of Suspended Sediment Loads at the Agricultural Watersheds in Hokkaido, Northern Japan　　　　　　　　　　　　　　　
Tetuaki Nagasawa, Yasuharu Umeda, Takashi Inoue
Land Reclamation: Advances in Research and Technology., American Society of Agricultural Engineers., 69, 75, 1992
English, International conference proceedings

Study on peatland subsidence. (I). Surface Movement and Fluctuations of Groundwater Level on Peatland.
梅田安治, 矢挽尚貴, 井上京
農業土木学会論文集, 160, 160, 27, 33, 1992, [Peer-reviewed]
Japanese, Scientific journal

Improvement of Road with Consideration to the Mire Hydrology　　　　　　　　　　　　　　　
Y. Umeda, T.Tsujii, H.Fujita, T.Inoue
Proceedings of International Peat Congress 1992, 3, 236, 1992, [Peer-reviewed]
English, International conference proceedings

Simplified Estimation of Mean Daily Discharge in a Tidal River Basin for Adequate Water Management -Development of flow estimation method for tidal river basin using mean daily water stage in the delta area of the Chao Phraya River, Thailand (I)-
Katsuro Shioda, Kazumi Iwasaki, Takashi Inoue, Virat Kao-Uppatum
Irrigation Engineering and Rural Planning, 22, 5, 17, 1992
English, Scientific journal

Patterns of Groundwater Table Fluctuations and Estimation of Evapotranspiration on Ruoergai Peatland, China
Yasuharu Umeda, Tetuaki Nagasawa, Takashi Inoue
J. Fac. Agri. Hokkaido Univ., 64, 3, 201, 207, Hokkaido University, 1990
English, Research institution

傾斜枠試験による土壌流亡挙動の研究（I） −1988年秋期における裸地区の水食−
長澤徹明, 梅田安治, 井上 京, 李里漫
北海道大学農学部邦文紀要, 17, 1, 11, 17, 北海道大学, 1990
Japanese, Research institution

Fluctuations of peatland surface and ground water level.
梅田安治, 井上京, 矢挽尚貴
土質工学会シンポジウム発表論文集, Ko-yukishitsudo ni Kansuru ..., 77, 82, 1989
Japanese, Symposium

Formation process of peatland and its property of subsidence.
梅田安治, 井上京, 矢挽尚貴
土質工学会シンポジウム発表論文集, Ko-yukishitsudo ni Kansuru ..., 75, 76, 1989
Japanese, Symposium

日平均水位を用いた感潮河川の流量把握　　　　　　　　　　　　　　　
塩田克郎, 井上 京
農業土木北海道, 11, 89, 96, 1989
Japanese, Scientific journal

The Influence of Evapotranspiration on the Groundwater Table in Peatland　　　　　　　　　　　　　　　
Yasuaru Umeda, Masao Shimizu, Takashi Inoue
Proceedings of the International Symposium on the Hydrology of Peatlands in Temperate and Cold Regions, Joensuu, Finland, 1, 164, 169, Jun. 1988, [Peer-reviewed]
English, International conference proceedings

タイ・チャオプラヤ河下流感潮域の流況解析
井上 京, 佐々木勝, 松尾和重
水と土, 73, 73, 22, 29, 農業土木技術研究会, 1988, [Peer-reviewed], [Lead author]
Japanese, Scientific journal

サロベツ泥炭地の地下水位とササ −泥炭地の形態的研究（III）−
梅田安治, 辻井達一, 井上 京, 清水雅男, 紺野康夫
北海道大学農学部邦文紀要, 16, 1, 70, 81, 北海道大学, 1988
Japanese, Research institution

Development of Flow Estimating Method for Tidal River Using Mean Daily Water Level　　　　　　　　　　　　　　　
K. Shioda, M. Sasaki, S. Vidhaya, K. Tanom, K. Virat, T. Inoue, T. Naka, H. Yoshino, K. Iwasaki
Proceedings of the Sixth Afro Asian Regional Conference, International Commission on Irrigation and Drainage, Cairo, Egypt, 2, B24.1, B24.14, 1987
English, International conference proceedings

開水路流れと管路流れの移行現象のシミュレーション手法の開発について
吉野秀雄, 小山潤, 岩崎和巳, 中達雄, 井上 京
農業土木学会論文集, 126, 99, 111, 1986, [Peer-reviewed]
Japanese, Scientific journal

Influence of Banking on Groundwater Hydrology in Peatland
Yasuharu Umeda, Tatsuichi Tsujii, Takashi Inoue
J. Fac. Agri. Hokkaido Univ., 62, 3, 222, 235, Hokkaido University, 1985
English, Research institution

The Influence of Evapotranspiration on the Groundwater Table in Peatland
Yasuharu Umeda, Takashi Inoue
J. Fac. Agri. Hokkaido Univ., 62, 2, 167, 181, Hokkaido University, 1985
English, Research institution

泥炭地の蒸発散と地下水位の変動 −美唄中の沢泥炭地の観測から−　　　　　　　　　　　　　　　
梅田安治, 井上 京, 赤沢 伝, 山上重吉
北海道の農業気象, 36, 17, 20, 1984
Japanese, Scientific journal

伏流式人工湿地ろ過システムは畜産排水を冬期も含め長期間安定して浄化できる
加藤 邦彦, 井上 京, 家次 秀浩, 辻 盛生, 畜産技術 = Livestock technology, 741, 22, 27, Feb. 2017
畜産技術協会, Japanese

11 有機性排水を浄化する多段型伏流式人工湿地ろ過システムの季節・経年安定性（東北支部講演会，2016年度各支部会）
加藤 邦彦, 戸上 和樹, 三浦 憲蔵, 井上 京, 家次 秀浩, 辻 盛生, 菅原 保英, 張 暁萌, 泉本 隼人, 青木 和彦, 工藤 一晃, 日本土壌肥料学会講演要旨集, 63, 0, 269, 269, 2017
一般社団法人 日本土壌肥料学会, Japanese

畜産系有機排水を安定して浄化する伏流式人工湿地ろ過システム　　　　　　　　　　　　　　　
加藤邦彦, 井上 京, 家次秀浩, 辻 盛生, 菅原保英, 環境技術, 46, 11, 575, 580, 2017
Japanese, Introduction commerce magazine

広域的な農地流動を考慮した農業生産基盤整備計画について
矢挽尚貴, 山本忠男, 井上京, 農村計画学会春期大会学術研究発表会要旨集, 2016, 2016

15 有機性汚水を浄化する伏流式人工湿地ろ過システムの処理効果と経済性の評価(東北支部講演会,2014年度各支部会)
加藤 邦彦, 井上 京, 家次 秀浩, 菅原 保英, 原田 純, 泉本 隼人, 張 暁萌, 岡 紀邦, 青木 和彦, 戸上 和樹, 工藤 一晃, 三浦 憲蔵, 日本土壌肥料学会講演要旨集, 61, 250, 250, 09 Sep. 2015
一般社団法人日本土壌肥料学会, Japanese

8-1-36 ハイブリッド伏流式人工湿地ろ過システムにおけるリン浄化機能の持続性と強化策(8-1 環境保全,2015年度京都大会)
加藤 邦彦, 井上 京, 家次 秀浩, 菅原 保英, 張 暁萌, 泉本 隼人, 青木 和彦, 戸上 和樹, 工藤 一晃, 日本土壌肥料学会講演要旨集, 61, 163, 163, 09 Sep. 2015
一般社団法人日本土壌肥料学会, Japanese

ハイブリッド伏流式人工湿地におけるリンの除去特性
泉本 隼人, 井上 京, 加藤 邦彦, 農業農村工学会北海道支部研究発表会講演集, 63, 38, 41, 29 Oct. 2014
農業農村工学会北海道支部, Japanese

ハイブリッド伏流式人工湿地における溶存態窒素の浄化メカニズム
原田 純, 井上 京, 加藤 邦彦, 農業農村工学会北海道支部研究発表会講演集, 63, 26, 31, 29 Oct. 2014
農業農村工学会北海道支部, Japanese

19 ハイブリッド伏流式人工湿地による有機性排水処理の浄化効果と放流水質の推定方法(東北支部講演会,2013年度各支部会)
加藤 邦彦, 井上 京, 家次 秀浩, 北川 勝治, 佐々木 仁, 菅原 保英, 原田 純, 櫻木 宏明, 呉 妲, 岡崎 圭毅, 中村 卓司, 青木 和彦, 三浦 憲蔵, 日本土壌肥料学会講演要旨集, 60, 258, 258, 09 Sep. 2014
一般社団法人日本土壌肥料学会, Japanese

8-1-31 有機性汚水を浄化する伏流式人工湿地ろ過システムの処理水質変動予測手法の検討 : 北海道において酪農雑排水および養豚尿液を浄化する施設について(8-1 環境保全,2014年度東京大会)
加藤 邦彦, 井上 京, 家次 秀浩, 菅原 保英, 原田 純, 泉本 隼人, 張 曉萌, 北川 勝治, 青木 和彦, 三浦 憲蔵, 日本土壌肥料学会講演要旨集, 60, 150, 150, 09 Sep. 2014
一般社団法人日本土壌肥料学会, Japanese

高濃度有機性汚水を低コストで浄化処理できるハイブリッド伏流式人工湿地ろ過システム
加藤 邦彦, 井上 京, 家次 秀浩, 畜産技術, 709, 17, 20, Jun. 2014
畜産技術協会, Japanese

人工湿地の浄化能力をさらに強化 : 高濃度有機性汚水を低コストで浄化できるハイブリッド伏流式人工湿地ろ過システム
加藤 邦彦, 井上 京, 家次 秀浩, 農家の友, 66, 4, 95, 97, Apr. 2014
北海道農業改良普及協会, Japanese

高濃度有機性汚水を低コストで浄化! : ハイブリッド伏流式人工湿地ろ過システム (特集 考えよう!生産現場の環境対策)
加藤 邦彦, 井上 京, 養鶏の友, 626, 26, 29, Apr. 2014
日本畜産振興会, Japanese

高濃度有機性汚水を低コストで浄化! : ハイブリッド伏流式人工湿地ろ過システム (特集 考えよう!生産現場の環境対策)
加藤 邦彦, 井上 京, 養牛の友, 457, 32, 35, Apr. 2014
日本畜産振興会, Japanese

高濃度有機性汚水を低コストで浄化! : ハイブリッド伏流式人工湿地ろ過システム (特集 考えよう!生産現場の環境対策)
加藤 邦彦, 井上 京, 養豚の友, 541, 27, 30, Apr. 2014
日本畜産振興会, Japanese

Change in Population Density of Potato Common Scab Pathogen, Streptomyces turgidiscabies in Wastewater of Potato-Starch-Producing Factory during Treatment Using Multi-stage Hybrid Wetland System
中山 尊登, 加藤 邦彦, 眞岡 哲夫, 滝澤 秀樹, 佐々木 仁, 井上 京, 北日本病害虫研究会報, 64, 40, 45, Dec. 2013
北海道において，バレイショは麦類，テンサイ，豆類と並んで輪作体系の根幹を担う重要な基幹作物のひとつである。平成22年度の北海道におけるバレイショ生産量は175.3万tで，このうち斜里町・網走市を中心とする地域を中心に74.5万tの澱粉原料用バレイショが生産され，17.9万tのバレイショ澱粉へと加工されている。バレイショ澱粉の製造工程は磨砕，脱汁，篩別，精製，脱水等の過程から成り(第1図)。その過程で多量の工場廃液が発生する。このうちデカンタ廃液は，原料バレイショを磨砕後，脱汁機(デカンタ)によって，固形分(澱粉と澱粉粕)から分離される液体で，年間70万t程度(工場あたり年間1万～10万トン程度)発生する。デカンタ廃液にはタンパク質やリンが多量に含まれ，生物的酸素要求量(BOD)が20,000～50,000ppmと極めて高く，処理までの貯留期間中に腐敗して強烈な臭気を発生し，工場近辺の生活環境に悪影響を及ぼすほか，廃液中にはバレイショの重要病原菌であるジャガイモそうか病菌(以下本文中で「そうか病菌」とは「ジャガイモそうか病菌」を指す)が混入していることが知られている(4) 。現在，澱粉工場廃液は，活性汚泥法等，種々の方法により浄化処理が行われているが，処理に要する大量のエネルギーが澱粉製造コストを押し上げる要因のひとつとなっていることから，低コストで効率的な廃液処理技術が求められている。本研究では伏流式ヨシ濾床人工湿地を用いた一連の澱粉工場廃液浄化試験過程で採取された処理水中のジャガイモそうか病菌Streptomyces. turgidiscabies (以下本文中では特に断らない限り，ジャガイモそうか病菌はS. turgidiscabiesを指すものとする)の菌密度変化を調査し，人工湿地処理による廃液中のそうか病菌密度の低減効果について考察した。, 北日本病害虫研究会, Japanese

17 伏流式人工湿地ろ過システムによる酪農排水の処理 : 極寒の道東における開始6年間の水質浄化効果(東北支部講演会,2012年度各支部会)
加藤 邦彦, 井上 京, 家次 秀浩, 北川 勝治, 木場 稔信, 横田 岳史, 菅原 保英, 角田 沙織, 高原 篤司, 郭 恵城, 日本土壌肥料学会講演要旨集, 59, 256, 256, 11 Sep. 2013
一般社団法人日本土壌肥料学会, Japanese

8-1-36 多段式ハイブリッド伏流式人工湿地システムによる養豚廃液の処理効果(8-1 環境保全,2013年度名古屋大会)
加藤 邦彦, 井上 京, 家次 秀浩, 北川 勝治, 菅原 保英, 岡崎 圭毅, 中村 卓司, 信濃 卓郎, 原田 純, 櫻木 宏明, 青木 和彦, 日本土壌肥料学会講演要旨集, 59, 161, 161, 11 Sep. 2013
一般社団法人日本土壌肥料学会, Japanese

ハイブリッド型伏流式人工湿地ろ過システムによる養豚尿液の処理効果
加藤邦彦, 井上京, 櫻木宏明, WU Da, 原田純, 富山貢, 家次秀浩, 北川勝治, 菅原保英, 岡崎圭毅, 中村卓司, 信濃卓郎, 日本水環境学会年会講演集, 47th, 309, 11 Mar. 2013
Japanese

ハイブリッド伏流式人工湿地による低濃度汚濁負荷の浄化
櫻木 宏明, 井上 京, 加藤 邦彦, 農業農村工学会北海道支部研究発表会講演集, 61, 108, 111, 30 Oct. 2012
農業農村工学会北海道支部, Japanese

多雪寒冷条件下にあるハイブリッド伏流式人工湿地による5年間の酪農パーラー排水浄化の経過
井上 京, 加藤 邦彦, 浦家 奈々, 農業農村工学会北海道支部研究発表会講演集, 61, 112, 115, 30 Oct. 2012
農業農村工学会北海道支部, Japanese

23-25 アカシアプランテーションにおける熱帯泥炭地の沈下と酸化分解(23.地球環境,2012年度鳥取大会)
石倉 究, 山田 浩之, Limin Atfritedy, 佐藤 空, Wijanarko Sigit, Bathgate John, 当真 要, 井上 京, 波多野 隆介, 日本土壌肥料学会講演要旨集, 58, 185, 185, 04 Sep. 2012
一般社団法人日本土壌肥料学会, Japanese

Paradigm shifts for organic matter management in rural areas with consideration for animal waste utilization and sound water environments
MAEDA Morihiro, KOUNO Kenji, TANIYAMA Ichiro, UEZONO Ichiro, WAKIKADO Hidemi, KATO Kunihiko, INOUE Takashi, NAKAMURA Masato, ITAHASHI Sunao, YABE Mitsuyasu, 日本土壌肥料學雜誌 = Journal of the science of soil and manure, Japan, 83, 2, 203, 209, 05 Apr. 2012
Japanese

北ドイツにおけるバイオガス利用とエネルギー作物栽培の動向
井上 京, 家次 秀浩, 饗庭 功, 農業農村工学会北海道支部研究発表会講演集, 60, 14, 17, 11 Oct. 2011
農業農村工学会北海道支部, Japanese

サロベツ湿原における泥炭中の炭素蓄積量とその空間分布推定
高田雅之, 井上京, 平野高司, 農業農村工学会大会講演会講演要旨集, 2011, 706-707, 12 Aug. 2011
Japanese

VIII-2 伏流式人工湿地システムによる高濃度有機性排水の再生と循環(VIII 家畜排せつ物の利活用と水質問題から考える有機物管理の次世代パラダイム,シンポジウム,2011年度つくば大会)
加藤 邦彦, 井上 京, 日本土壌肥料学会講演要旨集, 57, 234, 234, 08 Aug. 2011
一般社団法人日本土壌肥料学会, Japanese

伏流式人工湿地システムによる超高濃度排水の再生と循環
加藤邦彦, 井上京, 家次秀浩, 横田岳史, 木場稔信, 佐々木仁, 後藤友美, シャルマ プラディープ, 北川勝治, 宮地直道, 岡崎圭毅, 中山尊登, 眞岡哲夫, 信濃卓郎, 日本土壌肥料学会講演要旨集, 57, 57, 296, 296, 08 Aug. 2011
一般社団法人日本土壌肥料学会, Japanese

PLSAR干渉処理を用いた中央カリマンタンに於ける泥炭層の地盤沈下と温暖化ガス発生量の推定　　　　　　　　　　　　　　　
島田政信, 井上京, 波多野隆介, 粟屋善雄, 清野嘉之, Japan Geoscience Union Meeting 2011, STT057-10, May 2011
English, Summary international conference

インドネシア熱帯泥炭湿地の造林樹種Dyera lowiiの育苗における適切な被陰と灌水条件
稲田友弥, 斎藤秀之, 渋谷正人, 小池孝良, 井上京, HARSANTO Fransiskus A, GAMAN Sampang, PRAWIRA Yuda, LIMIN Suwido H, 日本森林学会大会学術講演集(CD−ROM), 122nd, ROMBUNNO.PA1-13, 25 Mar. 2011
Japanese

熱帯泥炭湿地における造林樹種Shorea balangeranの野火耐性
小出智也, 斎藤秀之, 井上京, 小池孝良, 渋谷正人, GAMAN Sampang, YUDA Prawira, LIMIN Suwido, 日本森林学会大会学術講演集(CD−ROM), 122nd, ROMBUNNO.PA1-33, 25 Mar. 2011
Japanese

Vegetation and microtopography of the patterned fen growing the relict species Carex livida in Sarufutsu-River, northern Hokkaido, Japan
KATO Yukie, FUJITA Hiroko, INOUE Takashi, Vegetation Science, 28, 1, 19, 37, 2011
Carex livida (Wahlenb.) Willd. (livid sedge) is a perennial herb of the family Cyperaceae that is mainly distributed across North America and northern Europe. It is phytogeographically classified as a North American element. In the Far East, its distribution extends to Kamchatka, Kuriles, Sakhalin, Hokkaido, southeastern Siberia, and northern areas of the Korean Peninsula. In Japan, it is only found in the mires of Mt. Taisetsu (central Hokkaido) and Sarufutsu River (northern Hokkaido). Because of this disjunctive distribution, C. livida is considered a relict species from the glacial period. As C. livida favors the circumpolar area, and its distribution in Hokkaido represents the southernmost locality, studying the vegetation and environmental factors that affect C. livida growth in the mires will provide a key to understanding the phytogeographical characteristics of other boreal and arctic plants in northern Japan. The aims of this study are (1) to clarify the phytosociological position of the mire vegetation of Sarufutsu where C. livida grows and (2) to examine the factors common to the mires where C. livida grows across the world. The vegetation and microtopography were surveyed at three mires in the central part of Sarufutsu River Mire. Vegetation was recorded using phytosociological methodology. Microtopography was measured at two areas along lines running in the direction of the slope. Vegetation survey classified the areas as one hollow (Schlenke) community (S1) and three hummock (Bult) communities (S2, S3, and S4). After comparing with the vegetation of mountainous and lowland mires in Hokkaido and Ozegahara Mire and Aizu-tashiroyama Mire in Honshu, it is suggested that the typical subcommunity of S1 (S1-1) corresponded to the hollow vegetation Scheuchzerio-Rhynchosporetum albae. The other subcommunity of S1 (S1-2) and the hummock herbaceous communities (S2 and S3) belong to the intermediate (bog-fen transition) mire Carici-Moliniopsietum japonicae, because Moliniopsis japonica was dominant, and the character and differential species of Carici-Moliniopsietum japonicae and Moliniopsietalia japonicae occurred in a large part of the study area. Carex livida mainly appeared in the hollow community. The microtopographical pattern wherein the kermis and strings were alternately arranged parallel to the contour lines of the sloping mire (called a "Kermi-Schlenke complex") was observed in the C. livida growing mires. In North America and northern Europe, C. livida grows in patterned fen, and the microtopography of this survey area was also regarded as a small patterned fen. Therefore, it is suggested that C. livida grows in and around the hollows in the mires with patterned topography., The Society of Vegetation Science, Japanese

酪農パーラー排水処理のためのヨシ濾床伏流式人工湿地の浄化性能
井上 京, Sharma Pradeep Kumar, 加藤 邦彦, 農業農村工学会北海道支部研究発表会講演集, 59, 118, 123, 15 Oct. 2010
農業農村工学会北海道支部, Japanese

26 様々な土地利用の熱帯泥炭地における泥炭沈下量と温室効果ガス発生量の関係(北海道支部講演会,2009年度各支部会)
山田 浩之, Limin Atfritedy, Drung Untung, Ujonarko Sigit, Bathgate John, 井上 京, 波多野 隆介, 日本土壌肥料学会講演要旨集, 56, 246, 246, 07 Sep. 2010
一般社団法人日本土壌肥料学会, Japanese

22-18 高濃度排水処理のための伏流式ヨシ濾床人工湿地の設計と効果 : 北海道における酪農排水・デンプン廃液・養豚尿液処理の現地実証(22.環境保全,2010年度北海道大会)
加藤 邦彦, 井上 京, 家次 秀浩, 木場 稔信, 佐々木 仁, 宮地 直道, Pradeep Sharma, 北川 勝治, 柳井 洋介, 横田 岳史, 日本土壌肥料学会講演要旨集, 56, 162, 162, 07 Sep. 2010
一般社団法人日本土壌肥料学会, Japanese

Groundwater Flow Model Considering Hydraulic Properties of Peat
岡田 操, 井上 京, 湿地研究 : 日本湿地学会誌, 1, 1, 3, 15, Aug. 2010
日本湿地学会誌編集委員会事務局, Japanese

熱帯泥炭地の造林樹種Shorea balangeranの耐火性
小出智也, 斎藤秀之, 井上京, SUWIDO Limin, 日本森林学会大会学術講演集(CD−ROM), 121st, ROMBUNNO.PA1-18, 02 Apr. 2010
Japanese

酪農・畜産排水処理のための人工湿地システム
加藤邦彦, 井上 京, 家次秀浩, 木場稔信, 富田邦彦, 農家の友, 2010, 5, 104, 106, 2010
北海道農業改良普及協会, Japanese, Introduction commerce magazine

The estimation of the spatial structure for environment factor in the mire using GIS technology
TAKADA Masayuki, INOUE Takashi, MISHIMA Yoshio, 地理情報システム学会講演論文集 = Papers and proceedings of the Geographic Information Systems Association, 18, 207, 210, 15 Oct. 2009
Japanese

37 土壌凍結地帯における伏流式人工湿地システム(ヨシ濾床浄化システム)による搾乳関連排水の浄化 : 6.現地実証試験における水質浄化能の評価とシステムの改良点(北海道支部講演会,2008年度各支部会)
木場 稔信, 加藤 邦彦, 家次 秀浩, 三枝 俊哉, 松本 武彦, 角田 沙織, 井上 京, 小林 創平, 北川 勝治, 鼻和 美明, 宮地 直道, 長澤 徹明, 日本土壌肥料学会講演要旨集, 55, 255, 255, 15 Sep. 2009
一般社団法人日本土壌肥料学会, Japanese

23-15 インドネシア熱帯泥炭地における温室効果ガス発生量と泥炭沈下量との関係(23.地球環境,2009度京都大会)
山田 浩之, Atfritedy Limin, 佐藤 空, Sigit Wijonarko, 当真 要, Untung Darung, 井上 京, 波多野 隆介, 日本土壌肥料学会講演要旨集, 55, 189, 189, 15 Sep. 2009
一般社団法人日本土壌肥料学会, Japanese

熱帯泥炭湿地に自生するトゥミ実生の湛水応答〜根の通気組織の発達〜
丸上裕史, 斎藤秀之, 井上京, 渋谷正人, 小池孝良, SUWIDO Limin, 日本森林学会大会学術講演集(CD−ROM), 120th, ROMBUNNO.PB3-19, 25 Mar. 2009
Japanese

酪農パーラー排水処理のための伏流式ヨシ濾床人工湿地システム
加藤邦彦, 井上 京, 木場稔信, 家次秀浩, 畜産技術, 2009, 6, 32, 37, 2009
畜産技術協会, Japanese, Introduction commerce magazine

New Design of Hybrid Reed Bed Constructed Wetland Systems for the Treatment of Milking Parlor Wastewater in Cold Climate Conditions of Hokkaido, Northern Japan　　　　　　　　　　　　　　　
Kunihiko Kato, Pradeep Kumar Sharma, Takashi Inoue, Hidehiro Ietsugu, Toshinobu Koba, Katsuji Kitagawa, Kunihiko Tomita, Takehiko Matsumoto, Tetuaki Nagasawa, IWA Specialist Group on Use of Macrophytes in Water Pollution Control: Newsletter, 34, 8, 12, 2009
English, Introduction other

泥炭地盤沈下が炭素貯蔵量に及ぼす影響
鈴村 大地, 井上 京, 高田 雅之, 農業農村工学会北海道支部研究発表会講演集, 57, 76, 79, 22 Oct. 2008
農業農村工学会北海道支部, Japanese

酪農流域における河川水質の長期的変動--「家畜排泄物管理適正化法」の効果
下川 昇大, 山本 忠男, 井上 京, 農業農村工学会北海道支部研究発表会講演集, 57, 0, 100, 105, 22 Oct. 2008
農業農村工学会北海道支部, Japanese

22-43 道北における酪農排水浄化のための伏流式人工湿地(ヨシ濾床)システムの現地実証 : 非火山性資材の活用と稲作による養分リサイクルの可能性(22.環境保全,2008年度愛知大会)
加藤 邦彦, 井上 京, 家次 秀浩, 富田 邦彦, シャルマ プラディープ, 吉友 郁哉, 野々村 正樹, 関根 基, 小林 創平, 山崎 真, 野副 卓人, 長澤 徹明, 日本土壌肥料学会講演要旨集, 54, 180, 180, 09 Sep. 2008
一般社団法人日本土壌肥料学会, Japanese

22-42 土壌凍結地帯における伏流式人工湿地システム(ヨシ濾床浄化システム)による搾乳関連排水の浄化 : 5.3年間の現地実証試験の結果について(22.環境保全,2008年度愛知大会)
木場 稔信, 加藤 邦彦, 家次 秀浩, 三枝 俊哉, 松本 武彦, 角田 沙織, 井上 京, 小林 創平, 北川 勝治, 柳谷 修自, 宮地 直道, 長澤 徹明, 日本土壌肥料学会講演要旨集, 54, 179, 179, 09 Sep. 2008
一般社団法人日本土壌肥料学会, Japanese

44 ヨシ濾床浄化システムによる搾乳牛舎排水浄化の現地実証 : 別海町と遠別町における処理効率の評価と施設の改善(北海道支部講演会,2007年度各支部会)
加藤 邦彦, 井上 京, 木場 稔信, 吉友 郁哉, 家次 秀浩, 富田 邦彦, 角田 沙織, 柳谷 修自, 三枝 俊哉, 宮地 直道, 日本土壌肥料学会講演要旨集, 54, 255, 255, 09 Sep. 2008
一般社団法人日本土壌肥料学会, Japanese

伏流式人工湿地（ヨシ濾床）浄化システムによるパーラー排水処理、第３弾、No.2 －道東（別海）と道北（遠別）の経過報告とシステムの進化－　　　　　　　　　　　　　　　
加藤邦彦, 井上京, Dairy Japan, 53, 15, 64, 67, Sep. 2008
Japanese, Introduction commerce magazine

伏流式人工湿地（ヨシ濾床）浄化システムによるパーラー排水処理、第３弾、No.1 －道東（別海）と道北（遠別）の経過報告とシステムの進化－　　　　　　　　　　　　　　　
加藤邦彦, 井上京, Dairy Japan, 53, 14, 57, 61, Aug. 2008
Japanese, Introduction commerce magazine

Estimation of Soil Surface Characteristics in Peatland Using ALOS/PALSAR　　　　　　　　　　　　　　　
258, 57, 63, 2008

ヨシ濾床浄化システムにおける窒素の動態
吉友 郁哉, 井上 京, 長澤 徹明, 農業農村工学会北海道支部研究発表会講演集, 56, 70, 75, 30 Oct. 2007
農業農村工学会北海道支部, Japanese

農業用水路の管路化による水質・水文環境への影響
小和田 桂太, 山本 忠男, 井上 京, 農業農村工学会北海道支部研究発表会講演集, 56, 0, 66, 69, 30 Oct. 2007
農業農村工学会北海道支部, Japanese

Application of satellite remote sensing technique to wetland conservation in Hokkaido, Japan　　　　　　　　　　　　　　　
The 13th CEReS International Symposium on Remote Sensing, in press, 2007

Characteristics of Pollutant Load Discharge during Snowmelt Period on Forested vs. Agricultural Watershed
OKAZAWA Hiromu, NAGASAWA Tetuaki, INOUE Takashi, YAMAMOTO Tadao, UNOKI Keiji, Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering, 73, 3, 257, 265, 25 Jun. 2005
農業土木学会, Japanese

River Water Quality and Hydrological Condition of Dairy Farming Watershed during Snowmelt and Ground Thawing Period
UNOKI Keiji, YAMAMOTO Tadao, INOUE Takashi, NAGASAWA Tetsuaki, OKAZAWA Hiromu, Transactions of the Agricultural Engineering Society,Japan, 71, 6, 733, 739, 25 Dec. 2003
農業土木学会, Japanese

河跡湖を地域資源として評価する −石狩川本流・中下流域の事例−　　　　　　　　　　　　　　　
長澤徹明, 井上 京, 山本忠男, 草 大輔, SDERD（（社）土地改良測量設計技術協会）, 54, 7, 13, 2001
Japanese, Introduction other

Behavior of Suspended Sediment Loads in Response to Rainstorms : Suspended Sediment Load of the Agricultural Watershed (I)
NAGASAWA Tetuaki, INOUE Takashi, YOKOYAMA Sinji, Transactions of the Agricultural Engineering Society,Japan, 68, 4, 425, 430, 25 Aug. 2000
農業土木学会, Japanese

Nitrogen Outflow and River Water Quality in Dairy Farming Area of Hokkaido
MUNEOKA Toshimi, NAGASAWA Tetuaki, INOUE Takashi, YAMAMOTO Tadao, Journal of the Japanese Society of Irrigation,Drainages and Reclamation Engineering, 68, 3, 1, 4, 01 Mar. 2000
農業土木学会, Japanese

熱帯泥炭大規模開発と環境問題
大崎 満, 井上 京, 電気協会報, 2000, 7, 42, 45, 2000
日本電気協会, Japanese, Introduction other

北海道東部浜中地区における流域の土地利用と河川水質
井上 京, 山本 忠男, 長澤 徹明, 農業土木学会論文集, 67, 2, 249, 256, Apr. 1999
農業土木学会, Japanese

Conservation of Mire Wetland in Hokkaido
UMEDA Yasuharu, INOUE Takashi, Journal of the Japanese Society of Irrigation,Drainages and Reclamation Engineering, 63, 3, 13, 18, 01 Mar. 1995
農業土木学会, Japanese

Fluctuation of ground and ground water level of peat bed.
井上京, 梅田安治, 矢挽尚貴, 農業土木学会大会講演会講演要旨集, 1990, 1990

Road structure and groundwater environment in peat soil area.
梅田安治, 井上京, 矢挽尚貴, 農業土木学会大会講演会講演要旨集, 1989, 1989

Fluctuation of ground water level in peat soil area and Sasa Arundinaria variabilis.
梅田安治, 井上京, 矢挽尚貴, 農業土木学会大会講演会講演要旨集, 1988, 1988

Observation of ground subsidence behavior of peat soil area. 2.
梅田安治, 井上京, 矢挽尚貴, 農業土木学会北海道支部研究発表会講演要旨集, 37th, 1988

Groundwater environment conservation measures during road construction in peat soil ground.
梅田安治, 井上京, 矢挽尚貴, 農業土木学会北海道支部研究発表会講演要旨集, 37th, 1988

Tropical Peatland Eco-management　　　　　　　　　　　　　　　
Editors, Mitsuru Osaki, Dr. Nobuyuki Tsuji, Nazir Foead, Jack Rieley, Chapter 19. Principles of Hydrological Management of Tropical Peatland (Hidenori Takahashi, Koichi Yamamoto, Takashi Inoue)
Springer Singapore, Apr. 2021, [Contributor]

サロベツ湿原と稚咲内砂丘林帯湖沼群 : その構造と変化
冨士田裕子, I サロベツ湿原 第3章 湿原の水文 1. 湿地溝と埋没河川（井上京・高田雅之），I サロベツ湿原 第3章 湿原の水文 2. 湿原の水収支（井上京・高田雅之・平野高司），I サロベツ湿原 第3章 湿原の水文 3. 高位泥炭地の水流動モデル（岡田操・井上京），I サロベツ湿原 第5章 泥炭 1. 泥炭の層厚分布, 2. 泥炭の性質と堆積構造（高田雅之・井上京），I サロベツ湿原 第5章 泥炭 3. 泥炭の間隙構造と水分保持（井上京），III 開発，環境変化と自然再生 第1章 地域の開発と環境変化 2. 河川改修と排水路の開削（井上京），III 開発，環境変化と自然再生 第1章 地域の開発と環境変化 4. 泥炭地盤沈下（井上京・高田雅之）
北海道大学出版会, Nov. 2014, 9784832982147, xvi, 252p, Japanese, [Contributor]

Daily Japan 2010年臨時増刊号「もっと知りたい環境対策」　　　　　　　　　　　　　　　
第13章 伏流式人工湿地（ヨシ濾床）システムによるパーラー排水処理，加藤邦彦・井上 京・家次秀浩，pp. 105-110
Daily Japan, 2010, [Contributor]

北海道の湿原　　　　　　　　　　　　　　　
辻井達一, 岡田 操, 高田雅之編著, 第4章 再生と共生の道 湿原道路の改修：井上 京, pp.184-186
北海道新聞社, 2007, [Contributor]

Participatory Strategy for Soil and Water Conservation　　　　　　　　　　　　　　　
Edited by, Machito MIHARA, Eiji YAMAJI, Influence of Near-River Area’s Land Use on River Water Quality during Rainfall Runoff in Agricultural Watersheds, pp. 39-44, Hiromu Okazawa, Tetuaki Nagasawa, Tadao Yamamoto and Takashi Inoue
Institute of Environment Rehabilitation and Conservation, 2004, [Contributor]

日本の水環境 １ 北海道編
日本水環境学会, １章 自然と水環境， 1.1.1 釧路湿原
技報堂出版, 2001, 4765531686, 7冊, Japanese, [Contributor]

積雪寒冷地の水文・水資源　　　　　　　　　　　　　　　
長澤徹明, 井上 京, 6章2節 大規模酪農地域における河川水質環境
（株）信山社サイテック, 1998, [Contributor]

Global Peat Resources　　　　　　　　　　　　　　　
Yasuharu Umeda, Takashi Inoue, Peatlands of Japan (pp. 179-182)
International Peat Society, 1996, [Contributor]

農業水利と地域の資源・環境　　　　　　　　　　　　　　　
井上 京, 第３章 低平泥炭地の水田水利
農業土木新聞社, 1995, [Contributor]

湿原生態系保全のためのモニタリング手法の確立に関する研究　　　　　　　　　　　　　　　
V. 泥炭地の水文・地下水，pp.235-308 IX. 湿原生態系保全のためのモニタリング手法，第２章第４節 水文・地下水のモニタリング，pp.414-416
前田一歩園財団, 1993, [Contributor]

サロベツ湿原の保全，環境庁サロベツ原野保全対策事業　　　　　　　　　　　　　　　
４．地下水位とその変動 pp.21-56 ５．湿地溝ダム試験 pp.57-60 ８．遮水壁の施工と影響 pp.79-84 補遺 遮水壁効果の追跡調査について pp.93-95
環境庁自然保護局, 1993, [Editor]

泥炭地用語事典　　　　　　　　　　　　　　　
北海道泥炭地研究会
エコ・ネットワーク, 1992, [Compilation]

泥炭地の土地利用と保全　　　　　　　　　　　　　　　
井上 京
土壌物理学会第53回シンポジウム「フィールド科学としての土壌物理学と社会への貢献」, 28 Oct. 2011, Japanese, Invited oral presentation
[Invited]

Wetland formation and vegetation changes after the Last Glacial period on the Konsen plateau in eastern Hokkaido, Japan
Grants-in-Aid for Scientific Research
01 Apr. 2018 - 31 Mar. 2021
FUJITA Hiroko
This study focuses on the wetlands on the marine terraces of Konsen plateau in eastern Hokkaido, to clarify the history of wetland formation and vegetation transition with consideration to the geomorphological development, peat accumulation, and the paleo-environmental changes.
It became clear that in this area, when after the marine terraces were formed, the wetland development began on the slight topographical depression on the terrace surface with favorable hydrological conditions for peat accumulation after the Last Glacial Maximum. With climate change in the early Middle Holocene, the peatland formation was continued in the wider area of this region. The later changes in the environmental conditions accompanied vegetation transition and finally reached the present wetland landscape. Through our study, we also discovered that the Habomai Shitsugen in the eastern part of the Nemuro Peninsula is the only blanket-type peatland in the low altitude areas of Japan.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 18H00762

Geomorphic development and vegetation change of the wetlands in the Sarufutsu River valley in northern Hokkaido, Japan
Grants-in-Aid for Scientific Research
01 Apr. 2015 - 31 Mar. 2018
FUJITA Hiroko, SAGAYA Tsumoru, SHIGENO Kiyoyuki, YOKOTA Akihiro, KATO Yukie, SAKAMOTO Tatsuhiko
This study aimed to elucidate the relationship between the formation of the wetlands in the Sarufutsu River valley with geomorphic development, sea-level change, and climate change. In addition to stratigraphic analysis, dating, analysis of plant macrofossil assemblages, pollen analysis, diatom analysis, etc. have been done from the core samples that were acquired by mechanical and manual drilling at the Sarufutsu River wetlands.
During the Jomon transgression seawater intruded into the middle to downstream of the valley but it didn't influence the upstream. But even in the upstream area, the formation of the wetlands started since the decline of sea level. This fact suggested that the climatic conditions during the period of coastline regression worked favorably for the wetland formation. The Naka-Shitsugen started the formation of present-type wetland vegetation from 2.4 ka. Maruyama Shitsugen and Kamisarufutu Nishi Shitsugen also started similar formation after 1.3 ka.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 15H02956

Application of ANAMMOX reaction to improve nitrogen purification of hybrid subsurface flow constructed wetland systems
Grants-in-Aid for Scientific Research
01 Apr. 2014 - 31 Mar. 2017
Kunihiko Kato
We surveyed the anammox presence in the 7-full-scale hybrid type CWs treating wastewater from livestock farming or livestock products industry, and clarified the relationship between wastewater condition and anammox concentration. Anammox existed with relatively higher concentration in the CWs treating swine wastewater or dairy wastewater with the last bed with vertical flow or before the last bed with horizontal flow, where BOD and COD concentration were low and NO2- and NO3- concentrations were high. The high concentration of anammox DNA continued, however they dropped in winter season with air temperature drops less than zero. This study provides new and useful information to intensify nitrogen removal in hybrid CWs by adding anammox treatment.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), National Agriculture and Food Research Organization, 26292185

Empirical study on constructs of sustainable agriculture and agricultural water management system in northwest of China.
Grants-in-Aid for Scientific Research
2009 - 2011
NAGASAWA Tetuaki, HATANO Ryusuke, INOUE Takashi, YAMAMOTO Tadao, HASEGAWA Shuichi, KAMIAY Mitsuhiko
In this study, we examined the water management issues based on present condition, and the mechanisms of soil salinization and its measures, for the purpose of soil and water conservation in Tarim River Basin. As results, we confirmed that the agricultural water distribution is rational system and the water saving irrigation systems have some problems. In addition, the continuous of border irrigation have possibilities to accelerate soil salinization. And sodium tends to flow out from irrigation district in the view on salinity balance.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 21405031

Carbon balance of a peatland ecosystem under the changing environment
Grants-in-Aid for Scientific Research
2008 - 2010
HIRANO Takashi, HATANO Ryusuke, INOUE Takashi, FUJITA Hiroko, YAMADA Hiroyuki, TAKADA Masayuki
We compared evapotranspiration and carbon balance between areas dominated by sphagnum species and vascular plats,"sasa" using flux monitoring data. Evapotranspiration during the snow-free season was higher at the sphagnum area than the sasa area, which does not support a hypothesis that the invasion of sasa plants with root systems dries the Sarobetsu Mire. The carbon balance during the snow-free season shows that both the ecosystems functioned as net CO_2 sinks to the atmosphere. In 2010, which had a very hot summer, net CO_2 uptake increased in the sphagnum area, whereas it decreased in the sasa area mainly because of increased ecosystem respiration due to high temperature.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 20241002

Optimization of tropical peatland management based on carbon flow control
Grants-in-Aid for Scientific Research
2007 - 2010
INOUE Takashi, HIRANO Takashi, HATANO Ryusuke, TANI Hiroshi, SAITOU Hideyuki, TAMAI Yutaka, OSAKI Mitsuru, HATA Hiroshi, HASHIDOKO Yasuyuki, URAKI Yasumitsu, TAWARAYA Keitaro, HARAGUCHI Akira, ABE Ryuichiro
Tropical peat land is a huge carbon sink involving an ecosystem that is very fragile but rich in biodiversity. This study deployed on establishment of measures for optimum land use and land management based on the viewpoint of control of carbon flow in tropical peatland. Prevention of peat fire, restoration of devastated land, sustainable bioproduction, and the reduction of environment load are the special interest that is rendered for the approach.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 19255016

Assessment of the reduction of carbon dioxide emission from tropicalpeatlands through environmental restoration
Grants-in-Aid for Scientific Research
2006 - 2008
HIRANO Takashi
東南アジアの低平地に分布する熱帯泥炭地は膨大な量の土壌炭素を貯留しているが, 開発による地下水位の低下などにより, 大量のCO_2を大気に放出する危険性が高まっている。そのため, CO_2排出量を抑制するために, 排水路を堰上げする簡易ダムによる環境修復が実施されている。本研究では, 生態系と大気との間のCO_2交換量をモニタリングし, ダムによる環境修復が熱帯泥炭の好気的分解を抑制し, CO_2排出量を低減させることを実証した。また, 衛星リモートセンシングを利用した地下水位の広域評価の可能性を示した。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 18403001

Conservation on regional environment in semi-arid areaby transfiguration of water management and landuse
Grants-in-Aid for Scientific Research
2006 - 2007
NAGASAWA Tetuaki, INOUE Takashi, YAMAMOTO Tadao, HASEGAWA Shuichi, KAMIYA Mitsuhiko, NAKAMURA Kazumasa, UNOKI Keiji
本研究では, 半乾燥地域の持続的農業のために, 適正な水土利用と管理に関する提言をおこなうことを目的とし, タリム河流域の農業水利と塩類集積の発生要因について検討した。その結果, この地域特有の農業水利の現状がある程度把握できた。特に冬季潅漑の特殊性が明確となった。また, 塩類集積の発生についても, 従来, この地域で云われていた高い地下水位を原因とする説とは異なる要因の予測ができた。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 19405035

Study of Agricultural Water Use and Environmental Conservation in Cold and Arid Region
Grants-in-Aid for Scientific Research
2005 - 2006
NAGASAWA Tetuaki, INOUE Takashi, YAMAMOTO Tadao, HASEGAWA Shuichi, KAMIYA Mitsuhiko, NAKAMURA Kazumasa
The purpose of this research proposes the solutions to environmental problems causing agricultural water-use in the cold and arid region. Recent 2 years, collaborative research with Japanese and Chinese scientists carried out field investigation above problems in the Tarim River watershed, Xinjiang Uygur Autonomous Region, China. That is, agricultural water-use, soil properties, groundwater conditions and water qualities conducted a field survey mainly at the Shaya irrigation district in the middle reaches of the Tarim River. At the same time, data about water and land resources, agricultural water balance, distribution method of the water, cropping system and others collected from the government offices.
Results of investigations and discussions revealed about conservation of the environment in that region as follows;
・Agricultural water distribution could not practice systematically because the developments of water resources and farmland are dependent.
・Systematic irrigation is difficult because water distribute by the supply-driven.
・Farmland accumulating salts is low permeability and high water content of soil. And groundwater table undergoes high level relatively.
・Salt concentration is low in summer but indicates relative high concentration in spring. We have considered the influence of irrigation and ground freezing in winter.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 17405039

Desertification hazard map to the agricultural and pasture area of Huang He (the Yellow River)
Grants-in-Aid for Scientific Research
2004 - 2006
MATSUOKA Nobuhiro, KON Hisashi, MATSUDA Tomoyoshi, KIMURA Reiji, KAMICHIKA Makio, WANG Cuffing
This research is conducted in the Loess Plateau in the northwestern part of China In our research, desertification will occur in case that "Climatic Production Factors" such as the climatic primary production of plants exceeds "Inhibition Factors" such as the soil moisture and pasturage.
Three groups are organized in our project members they are "Digital mesh data group", "Agronomy group" and "Pasturage group" and they are took part in our project as follows :
1) "Digital mesh data group" : It made mesh data of "climatic production factors" and investigated at the research field if the mesh data showed improper results.
2) "Agronomy group" : It developed models for "inhibition factors" for mesh data and the models are applied to mesh data. It also investigated at the research field if the mesh data showed improper results.
3) "Pasturage group" : It checked the products of "Digital mesh data group" and compared its results with pasturage intensity.
Finally, we made the hazard map to the Loess plateau with its resolution of 10km and it will contribute to protection of desertification for the Loess plateau.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Chiba University, 16404005

地域資源としての河跡湖の機能分析と評価
科学研究費助成事業
2003 - 2005
長澤 徹明, 井上 京, 山本 忠男
今年度は,天塩川流域の8ヵ所の河跡湖を対象とした地域資源としての機能分析と評価を中心に調査を実施した。また,過去2年間の石狩川流域河跡湖の調査結果とあわせて,研究の最終年度としてのとりまとめをおこなった。
まず,天塩川流域河跡湖の利用状況の把握や機能評価のために,当該地区の自治体をはじめとする管理主体を対象にヒアリング調査を実施した。その結果,天塩川流域上流に位置する河跡湖では,周辺土地利用は水田が卓越することから水田用水源・補助水源として利用されるものの,下流域では酪農主体の農業経営のため,単なる排水の受け皿として認識されていることが確認された。中流域の河跡湖では,親水公園利用がみられた。また,水面面積の大きな河跡湖では洪水調節機能が付せられていることもわかった。
つぎに河跡湖の水質環境について調査を実施した。各河跡湖において定期的に採水を実施し,さらに重点調査地として2ヵ所の河跡湖では水位変動と流出水量などの連続観測を実施した。窒素,リンに関する各水質項目は,おおむね夏季に良好となり,秋季から悪化する傾向があった。また,春季には,水田地帯の河跡湖で高濃度のSSやT-Nが確認された。これは,水田の代かき・田植えにともなう強制排水の影響と推察された。一方,畑地帯や酪農地帯における春季の水質も高濃度であり,この原因としては融雪や施肥などが影響していると考えられた。
現在,前年度の成果である石狩川河跡湖の水質変動モデルをもとに,今年度のデータを加え,天塩川河跡湖の水質変動モデルの適合性を検討中である。
日本学術振興会, 萌芽研究, 北海道大学, 15658066

Effects of large-scale environmental disturbances through land-use change and fires on the CO2 balance of tropical peat swamp forest
Grants-in-Aid for Scientific Research
2003 - 2005
HIRANO Takashi, INOUE Takashi, TANI Hiroshi, OSAKI Mitsuru, OKADA Keiji, KODAMA Yuji
Tropical peatlands, which coexist with swamp forests, have accumulated vast amounts of carbon as soil organic matter. Since the 1970s, however, deforestation and drainage have progressed on an enormous scale. In addition, El Nino and Southern Oscillation (ENSO) drought and large-scale fires, which grow larger under the drought condition, are accelerating peatland devastation. That devastation enhances decomposition of soil organic matter and increases the carbon release to the atmosphere as CO_2. This phenomenon suggests that tropical peatlands have already become a large CO_2 source, but related quantitative information is limited. Therefore, we evaluated the CO_2 balance of a tropical peat swamp forest in Central Kalimantan, Indonesia, using three years of CO_2 fluxes measured using the eddy covariance technique from 2002 through 2004. The forest was disturbed by drainage; consequently, groundwater level (GL) was reduced. The net ecosystem CO_2 production (NEP) measurements showed seasonal variation, which was slightly positive or almost zero in the early dry season, and most-negative late in the dry season or early the rainy season. This seasonality is attributable to the seasonal pattern of climate, tree phenology and fires. Slightly positive NEP resulted from smaller ecosystem respiration (RE) and larger gross primary production (GPP) under conditions of high photosynthetic photon flux density (PPFD) and large leaf area index (LAI). The most-negative NEP resulted from smaller GPP and larger RE. The smaller GPP was related to high vapor pressure deficit (VPD), small LAI and low PPFD because of smoke from fires. The larger RE was related to low GL. Annual NEP values were estimated respectively as-602,-382 and-313 gC m^<-2> y^<-1> for 2002, 2003 and 2004. These negative NEP values show that the tropical peat swamp forest, disturbed by drainage, functioned as a CO_2 source. That source intensity was highest in 2002, an ENSO year, mainly because of low PPFD caused by dense smoke emitted from large fires.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 15255001

Research on Effective Installation of Subsurface Drain and the Maintenance of its Function
Grants-in-Aid for Scientific Research
2002 - 2005
INOUE Takashi, KASHIWAGI Jun-ichi, YAMAMOTO Tadao, NAKAMURA Kazumasa
Subsurface drainage is one of the important technologies for the improvement of field condition for agricultural productivity. Simple and objective method for evaluation of efficiency of subsurface drain is required. Inoue and Yamamoto investigated the problem of pipe drain from the viewpoint of its condition of installation by analyzing the concavity and convexity of pipe alignment, and proposed the use of deviation from the configured alignment and the flexion rate of pipe for the pipe condition. The sustainability of drainage function was also verified by continuous measurement of groundwater level and pipe discharge. It is proved that the drainage capability gradually declines with the age.
Kashiwagi made investigation on dairy grass productivity and the effect of subsurface drain. Nakamura also made long-term survey on groundwater level and the efficiency of subsurface drain in the paddy-converted upland field. He especially made precise survey on soil permeability condition between two underdrain pipes.
Kitagawa developed new technology of 'Cutting drain method' for the restoration of drainage function of the field. This method is applicable not only for peat soil but also for Andosol and gray upland soil. It is a kind of mole drain but has more durability on decay, and cheap to construct. He also developed filter material to avoid clogging of the drainage pipe in acid soil such as mudflow region in downstream of Mt.Tokachi-dake.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 14360137

人工湿地による水質浄化に関する研究　　　　　　　　　　　　　　　
2005
Competitive research funding

Study on constructed wetland and water pollution control　　　　　　　　　　　　　　　
2005
Competitive research funding

泥炭地湿原の再生手法確立に関する研究
科学研究費助成事業
2002 - 2004
井上 京, 冨士田 裕子, 山本 忠男
泥炭地湿原植生の復元手法を確立するために、札幌市内に残存する篠路湿地と、道北のサロベツ湿原において復元実験を行なった。
篠路湿地は相観的にはササ原の状態にある。現状把握の調査の結果、篠路湿地には、6群落が分布し、乾燥化にともなう退行遷移の進行が示された。ミズゴケが残存し、湿原特有の植物もみられるヌマガヤ-ミズゴケ群落は、空中写真の解析から泥炭をはぎ取った跡地に成立した植生であることが判明した。現地での植生復元実験から、地表から20〜30cmの分解の進行した泥炭を排除すると、相対的に地下水位が高くなり、ササの排除と低層湿原種の出現が期待できることが明らかになった。出現する植物の中には、現植生内では見られないものが出現し、泥炭内の埋土種子由来と考えられた。
サロベツ湿原では、道路側溝の影響で地下水位が低下し、ササの侵入が著しい場所でミズゴケ優占植生の復元実験を行なっている。実験は条件をかえ、近隣から刈り取ってきたミズゴケの切片を方形区内におおよそ25%面積を覆うように播くもので、ササの地上部を刈り取り、泥炭地面を覆うリターを取り除くことで、2年で被度80%以上までミズゴケを活着・増殖できることが明らかになった。また、泥炭表土を剥ぎ、相対的に地下水位を高くすると、出現するのは周辺の湿原構成植物がほとんどであるが、一部埋土種子由来と考えられる種が確認された。ただしこの地区の地下水位状況は、道路側溝の影響で低下したままであり、本来の高層湿原的環境にないことも確認された。
このほか、石狩平野・新篠津村の残存原野では、地下水位低下を防ぎつつ湿原植生を復元させることが検討されており、現状把握のための植生調査と地下水位変動調査を実施した。その結果、周辺排水路等の影響で地下水位低下が原野の中心部でも顕著に生じていることが判明し、そのための対策が必要なことが明らかとなった。
日本学術振興会, 萌芽研究, 北海道大学, 14656086

Analysis and management of environmental loads caused by large scale disturbance in peatland of Southeast Asia
Grants-in-Aid for Scientific Research
2001 - 2004
OSAKI Mitsuru, KOUYAMA Takashi, INOUE Takashi, HIRANO Takashi, MATSUBARA Kenji
Huge amount of tropical peat distribute in Kalimantan, Indonesia, which face a crisis of decomposition by frequent fire because of unruly development and irregular logging. As CO_2 by fire and microorganisms are tremendously, it is observed CO_2 increase in atmosphere clearly. Therfore, we have studied here to rehabilitate forestry and to conserve peat soil in devastated peat land. Obtained results are as follows.
(1)Estimation of environmental values
1)Dynamics of chemical compounds and lignin degradation
Dynamics of chemical compounds was estimated in peat soil, river, and lake, for which many samples were analyzed. Many number of white rot fungi was isolated from peat soil and wood, some of which have activity to degradation lignin, PCB, Dioxin, so on.
2)Observation of microclimate in tropical peat forestry
Microclimate and CO_2 flux were observed at 1)Natural forestry in Kalampangan, which became more dry by affecting on canal digging,2)Burned forestry in Kalampangan, which also became more dry by affecting on canal digging, and 3)Natural laboratory in Setia Alam, which is kept natural condition. We found that disturbed forestry became now carbon source because of low photosynthesis and peat decomposition by microorganisms, which is first finding in the world.
(2)Region management system
1)Forestry rehabilitation
As Shorea balangeran and S.selanica show high revival ratio and good growth in peat soil, we used these species for rehabilitation in devastated peat land near Palamgka Raya in Central Kalimantan.
2)Human Dimension Program
It is very important environmental education for environmental conservation. We develop environmental education program, then teach school students and regional inhabitants. Also we develop an integrated model on rehabilitation and conservation of peat land by the regional inhabitants.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), HOKKAIDO UNIVERSITY, 13375011

The field survey for the elucidation of the mechanism and the control of the drought that occurs frequently in the agricultural zone of the yellow river basin in recent years
Grants-in-Aid for Scientific Research
2001 - 2003
MATSUOKA Nobuhiro, INOUE Takashi, MATSUDA Tomoyoshi, KON Hisashi, KAMOCHIKA Makio, WANG Xufeng
In the agricultural area in the Yellow River basin in China, a water shortage occurred frequently in 1972 and continued until 1999. We clarified this mechanism and proposed a suitable agricultural form.
Evaluation of water resources of the Yellow River basin was performed. The model with surface temperature and albedo by GMS presumes the precipitation of 14 points by multiple linear regression analysis. From this model, we concluded that the precipitation of the Yellow River basin does not have a downward tendency.
We developed a model for the solar and net radiation by satellite data and applied to Shenmu and Yucheng form June 2000 to December 2002. The distribution of solar radiation is similar to the climate map by observation. We also developed a model for evapo-transpiration and applied to Ansai. The model showed there were 151 days of water shortage for crops. To keep sufficient water content, irrigation with 239mm of water was needed.
The water use in the lower basin is affected the outflow from the upper and the middle basin and although the effort to effective water use was made, the situation is still unpredictable. We also investigated the change of the vegetation in the lower basin of Yellow River during the periods of dry-up of the river by satellite data and observational data in 1981-2000 and found the correlation between the water flow rate and NDVI. It came from the uptake of water from the Yellow River to irrigate the autumn.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Chiba University, 13574015

Establishment of Inventory on Carbon and Nutrient Cycling in Tropical Peatland Ecosystems for Sustainable Agro-production and Environmental Conservation
Grants-in-Aid for Scientific Research
2001 - 2003
HATANO Ryusuke, INOUE Takashi, YONEBAYASHI Koyo, OKAZAKI Masanori, TOYOTA Koki, KURAMOCHI Kanta
Tropical peatland is important for net carbon (C) storage in the global land surface, but it is also believed to be a major emission source of CH4.Land resource exploitation and burning of peat increases C release from the peatland, and thus contributes to overall global warming. In order in discern the magnitude of agricultural and fire impacts in tropical peatlands on global warming, ground surface emissions of three major greenhouse gases (GHG), CO2, CH4 and N2O, were measured in various ecosystems including forests and agricultural fields, as well as fire-affected lands in Karampangan zone, near Plangka Raya, from 2001 to 2003.After forest burning, the GWP decreased in 32-42% of the GWP from the natural forest, with 99% of the GWP occurring from CO2 emission. However, no trees could absorb the CO2, so the CO2 emissions went directly to the atmosphere.CH4 was emitted from the burned peatland, while CH4 uptake was observed in both the natural and regenerated forests.
The GWP in the agricultural field was approximately 2 times larger than that from the natural forest. CO2 emission in the agricultural field was about 5 times larger than that in Japanese crop fields and accounted for 50-90% of the GWP. The remaining GWP was contributed by N2O emission. The N2O emission was considerably high, accounting for 4-23% of the nitrogen (N) application rate of 626 kg N ha1 yr-1.This is probably due to high peat decomposition and high nitrification enhanced by high pH and high exchangeable Ca content us the agricultural fields.
Magnitude of forest fire impact on global warming was much higher than agricultural impact. But nitrogen application in agricultural field, which may accelerate peas decomposition, enhanced N2O emission and deduced CH4 uptake.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 13574012

RESEARCH ON STATE OF LAND SUBSIDENCE OF PEATLAND AND ITS MECHANISM
Grants-in-Aid for Scientific Research
1999 - 2000
INOUE Takashi, YAMAMOTO Tadao, KAWABATA Shin-ichiro, KAMIYA Mitsuhiko
The purpose of this research project is to clarify the state and the mechanism of large area subsidence in peatland after its opening for agriculture, and to estimate its future sink. The flat lowland of lower reaches of Ishikari River Basin, Shinotsu Mire, has been chosen as research site, where peat covers in wide range and in the average depth of 3 to 5 meters. We collected old and new maps and plans that involve information of ground height. The characteristics of peat were examined from peat boring. GIS was used for analysis of large area investigation and the functions that influences to the peat subsidence. We also established on-site continuous observation point for ground and peat layer fluctuations. Results are as follows ;
1) From 1956 to 1996, average of 0.4 meters and maximum of 2.9 meters of land subsidence is detected from this area. In past 40 years, large amount of subsidence was found from newly opened area, while old agricultural area also still shows continuing subsidence of peat surface. No clear relations have been found between peat layer thickness, amount of mineral soil dressing, history of landuse and the amount of subsidence.
2) Continuous on-site observation site was established for investigating the ground surface and peat layer movement. The precise fluctuations of peat ground were recorded during the project period. It became clear that these peat layer fluctuations were closely related to changes in shallow-groundwater table, and depth of snow cover.
3) From this research, we concluded that the land subsidence in this area, though its speed may reduce, will prolong for long period.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), HOKKAIDO UNIVERSITY, 11660235

Conservation of Water Related Environment of Watersheds with Agriculture and Forestry Landuse in Cold Region.
Grants-in-Aid for Scientific Research
1997 - 1999
NAGASAWA Tetuaki, SATO Fuyuki, HATANO Ryusuke, INOUE Takashi, YAMAMOTO Tadao, KUDO Akira
In this project, researches were made on water and material circulation, water use and rural area management, sustainable agriculture and environmental conservaion for the agricultural and forest area in cold regions.
1) Relation between land use and river water quality was investigated on Shubuto river basin, southwestern Hokkaido. Watershed including agrictural land shows high concentrations on water quality when the amount of retained water in the watershed gets less.
2) Characteristics of changes in water quality during snowmelt period were investigated using the principal component analysis.
3) The effect of circulating irrigation system to the water quality and material balance were examined in lowland area of Tsugaru, Aomori. Not only the output of water, but also the output of eutrophic substances to the lakes and rivers of lower raehes were reduced due to circulating irrigation.
4) Regional characteristics of T-N, T-P and dissolved SiOィイD22ィエD2 concentration in river water of Hokkaido during snow melt period was investigated in conjunction with land use and soil type of each watersheds.
5) Study on ion composition of snow and snowmelt water from bottom of snow cover was tested in the forest area of northern Hokkaido. It was shown that the ion component are easily released from the snow at the early stage of snowmelt period.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 09460104

湿地系の水文学展開のための基礎的研究
科学研究費助成事業
1996 - 1997
井上 京, 柏木 淳一, 富士田 裕子, 高橋 英紀
湿地系では水の態様、すなわちその水文学が非常に重要な役割を有している。湿地系の土地利用、特にその保全や復元を考えるとき、水文学的検討を十分におこなうことが必要であるが、平坦で過湿な湿地系の水文について、水収支や水流動の形態についてこれまで十分な解明がなされたとはいいがたい。本研究は、特に北海道に広く分布する泥炭地湿原において、その形質を決定づけている水文環境について、泥炭地表面における水分動態を地下水位変動を指標として明らかにし、それをもとに水収支モデルを構築し、泥炭地の保全・復元に資することを目的とした。
本研究では北海道北部のサロベツ泥炭地において、各種観測・調査をおこなった。精密な地下水位変動および降雨量の観測を実施し、同時に電気伝導度計(EC計)を用いて、地下水のEC変化を連続観測し、地下水位変動とEC変動の関連を解析した。また現地に設置した簡易なライシメータでのデータを元に、降雨直後の水の動態、あるいは無降雨時の蒸発散が地下水位低下に及ぼす影響等を検討した。さらに表層泥炭の透水性についての検討を、室内実験をもとにおこなった。
泥炭地の地下水位変動をモデル化し、蒸発散の季節変化にともなう地下水位変動への影響、水分動態における蒸発散の寄与の割合等を明らかにした。また植生調査を実施し、植生ならびにその群落構造と蒸発散、地下水位変動との関連について検討した。さらに特異な間隙構造を有する泥炭の透水性、不均一性等について、軟X線画像による解析を試みた。
日本学術振興会, 萌芽的研究, 北海道大学, 08876043

Study on Agricultural Landuse and Conservation of Regional Resources
Grants-in-Aid for Scientific Research
1995 - 1996
NAGASAWA Tetuaki, INOUE Takashi
The purpose of this research is to verify properties of use and conservation of regional resources and to investigate establishment and enforcement of the use plan otherwise establishment, propulsion and correction of conservative measures. For that purpose utilizing of the landuse and the water quality is effective as an objective index. One of ways for grasp the regional environment is to make the landuse and the river water quality clear.
The following results of research and examination were obtained ;
1) Paddy field irrigation has a seriously effect on the river water quality in ordinary water discharge.
2) In rainfall, pattern of pollution runoff and water quality vary with hydrological conditions.
3) Water quality of snowmelting has changed under snowmelting period.
4) The reaching rate and quantity of pollutant load control the factor of the river water quality in agricultural watershed. These are closely connected with situation of the landuse.
This research presented a key of consideration for task of ecological conservation in regional resources.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 07456102

STUDY ON LAND-USE AND LANDSCAPE OF LOW-WETLAND RURAL AREA
Grants-in-Aid for Scientific Research
1994 - 1996
INOUE Takashi, YAZAWA Masao, NAGASAWA Tetsuaki, UMEDA Yasuharu
Low-wetland area essentially retains high bio-productivity. Agricultural use of such areas now have been inquired for much higher level on both developed and developing countries. This means that the evaluation of these low-wetland area must be done not only by the base of product output, but also on the view point of quality-of-life for people who live there, and also on the value of common wealth for whole society.
This project aimed to evaluate agricultural land-use and landscape of low-wetland ecotope, revealing the social factors contributes to the formation of rural area and its development, to clarify the land-use problem involved on the area, and to present future prospect for rural planning and development of such areas.
The actual study was executed on the lowland peat area of Hokkaido, of which agricultural development has been operated since Meiji era.Stadies were focused on ; types and natural conditions of the wetland ; history and progression of mire development ; formation of community ; changes in agriculture and land-use ; water use and drainage ; land stability and subsidence ; changes on paddy field block size ; natural environment change ; etc...
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 06402057

Study on River Water Quality and Agricultural Land Use
Grants-in-Aid for Scientific Research
1993 - 1994
NAGASAWA Tetuaki, INOUE Takashi
The present state of river water quality of several agricultural areas in Hokkaido, Japan, was studied. From standpoint of water environment conservation, some consideration was made to the land use as it ought to be.
River water concentrations of dairy farming basins show following tendency ; [Forest basin with natural river channel] << [Dairy farming basin with natural river channel] < [Dairy farming basin with artificial river channel]. It is remarkable that 80% of total nitrogen take form of NO_3-N in dairy farming basins, and that the concentration is higher in basin of large cattle population density per pasture, which suggests the apparent evidence of NO_3-N eluviation.
Densely populated basin of cattle also shows severe water pollution in relation between river flow and concentration. Artificial river channel indicates higher concentration than that of natural river channel on same level density of cattle population. The function of riparian forest and wetland zones as buffer filter is confirmed.
From the fact mentioned above, development of river basin and enlargement of farm keeping give impact not only by scale and condition of farm management, but also influences by the condition of river channel and land use of the basin.
The concept about direction of river environment conservation was mentioned using two axs correspond to input and output of load.
Japan Society for the Promotion of Science, Grant-in-Aid for General Scientific Research (B), Hokkaido University, 05452323

Water balance and physiology of hygrophyte in cold regions.
Grants-in-Aid for Scientific Research
1992 - 1993
TAKAHASHI Hidenori, HARADA Jiro, INOUE Takashi, FUJITA Hiroko
Vegetation type, water physiology and water/heat balances of hygrophytes community were investigated in the Sarobetsu Mire, North Hokkaido. The results are summarized as follows,
a) Diurnal changes of stomatal conductance were measured by a diffusion porometer for six species (Sasa palumata, Moliniopsis japonica, Myrica gale var.tomentosa, Ledum palusire var.diversipilosum, Chamaedaphne calyculata, llex crenata var.paldosa) growing in the Sasa-Hygrophytes mixed community.
b) Water potential at a depth of 10cm in the peat soil was closed to zero throughout the summer though the ground water level dropped to 40cm below the surface during dry weather.
c) The diameter of the subterranean stem of Myrica gale var. tomentosa were decreased and the length of them were extended with rising ground water level in this site.
d) Stomatal conductances of the six species were correlated negatively with daily maximum VPD (vapor pressure deficit). When the daytime VPD was large, stomatal conductance maintained at small values and VPD was the main factor to determine the transpiration.
Japan Society for the Promotion of Science, Grant-in-Aid for General Scientific Research (B), Graduate School of Environmental Science, Hokkaido University, 04454099

地域環境における水循環の役割の解明と適正化　　　　　　　　　　　　　　　
1987
Competitive research funding

泥炭地の保全と適正利用　　　　　　　　　　　　　　　
1987
Competitive research funding

Function of Hydrology and its Management in Regional Environment　　　　　　　　　　　　　　　
1987
Competitive research funding

Management and conservation of peatland　　　　　　　　　　　　　　　
1987
Competitive research funding