Researcher Profile and Settings

Master

Affiliation (Master)

• Research Faculty of Agriculture　Fundamental AgriScience Research　Bioresource and Environmental Engineering

Affiliation (Master)

• Research Faculty of Agriculture　Fundamental AgriScience Research　Bioresource and Environmental Engineering

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Profile and Settings

Degree

• Ph.D.（Hokkaido University）
• M.Eng.（Okayama University）

Profile and Settings

• Name (Japanese)

  Yamada

• Name (Kana)

  Hiroyuki

• Name

  200901011708717142

Alternate Names

https://sites.google.com/view/hiroyuki-yamada
http://www.agr.hokudai.ac.jp/env/info/

Achievement

Research Interests

• モニタリングシステム開発   EcoInformatics   informatics   Peatland   Sediment pollution   水環境   生物多様性保全   湿原保全   Hydrology   生態学   Ecology   

Research Areas

• Environmental science/Agricultural science / Environmental policy and society
• Environmental science/Agricultural science / Environmental impact assessment
• Environmental science/Agricultural science / Agricultural environmental and information engineering
• Life sciences / Ecology and environmental science
• Natural sciences / Atmospheric and hydrospheric science
• Environmental science/Agricultural science / Landscape science
• Environmental science/Agricultural science / Environmental agriculture

Research Experience

• 2012/08 - Today Hokkaido University Lecturer
• 2007/04 - 2012/07 Hokkaido University Graduate School of Agriculture Research Faculty of Agriculture
• 2006/01 - 2007/03 Hokkaido University Graduate School of Agriculture Research Faculty of Agriculture
• 2004/01 - 2005/12 北海道大学大学院農学研究科 助手
• 2003/01 - 2003/12 Kyoto University Disaster Prevention Research Institute
• 2002/10 - 2002/12 Kyoto University Disaster Prevention Research Institute
• 2002/04 - 2002/09 北海道大学大学院農学研究科 研究員

Education

• 1999/04 - 2002/03  北海道大学大学院
• 1996/04 - 1998/03  Okayama University
• 1994/04 - 1996/03  Okayama University  Faculty of Engineering

Awards

• 2013 北海道大学 北海道大学職員表彰
   

  受賞者: 山田 浩之
• 2010 応用生態工学会大会口頭発表賞
  
• 2003 応用生態工学会第７回大会優秀ポスター賞
  
• 1996 平成8年度土木学会中国支部若手優秀発表者賞
  
• 1994 全国高専土木学会近藤賞
  

Published Papers

• VR教材を用いた教育実践の研究動向と環境教育に関する一考察

  田開寛太郎, 山田浩之, 鈴木透, 中村隆俊

  松本大学教育総合研究 (7) 51 - 64 2023/11 [Refereed]
  
• Varying stages of ecological succession in lakes subdivided by volcanic eruptions at Akan Caldera, Japan

  Isamu Wakana, Yasuro Kadono, Jotaro Urabe, Yuki Tamura, Yoshifusa Suzuki, Hiroyuki Yamada, Yoichi Oyama, Keiji Wada, Takeshi Hasegawa, Masashi Ohara

  Hydrobiologia 850 (18) 3919 - 3933 0018-8158 2023/04/23 

  Abstract Ecological succession within lakes generally proceeds as eutrophication and shallowing occur and the aquatic biota of the lakes is altered. The eutrophication rate depends on the lake size and the area and fertility of the watershed. If the watershed fertility of several different lakes is equivalent and the lakes’ formation time and initial environment are similar, the trophic status of each lake is expected to increase over time depending on the ratio of the watershed area to lake size. To test this supposition, we surveyed the topography and water quality of 10 lakes of varying sizes in Akan Caldera, Japan, which were formed thousands of years ago by fragmentation due to volcanic eruptions within the caldera. The ratio of the accumulated watershed area to lake size was positively correlated with total phosphorus concentration, an indicator of trophic status, and lake types were classified as oligotrophic, mesotrophic, eutrophic, and dystrophic. In addition, 21 species of macrophytes were found in the lakes, and the species composition of each lake was divided into five types corresponding to combinations of the lake types. The discovery of such diversity in a group of lakes with a similar origin paves the way for new comparative studies.
• 全周魚眼スマートフォンカメラと画像処理を用いた魚類の遠隔モニタリング

  山中登生, 山田浩之, 藤本泰文, 嶋田哲郎

  応用生態工学 23 (2) 409 - 413 2021/03 [Refereed][Not invited]
  
• UAV空撮による全方位動画を用いた湿原植生調査法の開発と評価

  中村隆俊, 大木慎也, 山田浩之

  応用生態工学 23 (2) 383 - 394 2021/03 [Refereed][Not invited]
  
• Development of a Small Electric Robot Boat for Mowing Aquatic Weeds

  Yutaka Kaizu, Tetsuo Shimada, Yusuke Takahashi, Sho Igarashi, Hiroyuki Yamada, Kenichi Furuhashi, Kenji Imou

  Transactions of the ASABE 64 (3) 1073 - 1082 2151-0032 2021 [Refereed]
   

  Highlights A small, automatically guided electric robot boat was developed to control the growth of aquatic plants in lakes. The robot boat was able to mow without becoming entangled with aquatic plants due to the paddle propulsion mechanism. The average speed was 0.41 m s^-1, and the lateral deviation from the set path was 9.4 cm. The growth restraint effect was confirmed using aerial images collected by a drone. Abstract. At present, aquatic plants are becoming a problem in various lakes. Aquatic weeds that grow to high densities cause decreases in the oxygen concentration in the water, accumulation of sludge, and adverse effects on water use facilities and fisheries. Although there are large machines for cutting and harvesting aquatic plants, their use is limited due to their high cost, large size, and heavy weight. On the other hand, manual cutting is very labor intensive and inefficient. Therefore, in this research, we developed a labor-saving and low-cost robot boat to mow aquatic plants. This robot boat is automatically controlled by a real-time kinematic global navigational satellite system (RTK-GNSS) and is characterized by its small size, light weight, excellent portability, and low energy consumption. In addition, a paddle mechanism that replaces a conventional propeller was introduced as a propulsion mechanism to prevent entanglement of water plants and enable long-term automatic navigation. Mowing lotus (Nelumbo nucifera) in Lake Izunuma, Miyagi prefecture, Japan, confirmed that mowing could be properly conducted with a lateral deviation of 9.4 cm, average speed of 0.41 m s-1, and average power consumption of 518 W even when lotus was at its densest growth. If the cutting width of the robot boat was 1.2 m and the sidelap width was 0.3 m, the theoretical field work rate would be 0.133 ha h-1. Images captured by a drone confirmed that cutting with the robot boat was effective in suppressing the growth of lotus. It was found that the effect of suppressing growth was maximized by mowing at the time when the stopping leaves appeared in the late growth stage of lotus. Keywords: Autonomous navigation, Lotus, Moving baseline, Robot operation system, RTK-GNSS, Virtual private network.
• カメラおよび画像処理技術を活用した生態系モニタリング

  山田浩之, 上野裕介

  応用生態工学 23 (2) 365 - 368 2021
• Production of a“digital-analogue tally counter” and its use on counting greater white-fronted geese

  牛山克巳, 高橋佑亮, 嶋田哲郎, 鈴木透, 山田浩之

  湿地研究 10 (1) 79 - 83 2020/03 [Refereed][Not invited]
  
• Mapping submerged aquatic vegetation in Lake Akan from WorldView-2 image by SAVMA method

  尾山洋一, 山田浩之, 松下文経, 福島武彦

  湿地研究 10 (1) 53 - 66 2185-4238 2020/03 [Refereed][Not invited]
  
• 農業活動がラムサール条約湿地宮島沼の水質の時空間変動に及ぼす影響

  横山諒, 山田浩之, 木塚俊和, 海津裕, 遊佐健, 牛山克巳

  湿地研究 9 (1) 3 - 16 2019 [Refereed][Not invited]
  
• 全周魚眼スマートフォンカメラを用いた水生生物の遠隔モニタリング

  藤本泰文, 山田浩之, 倉谷忠禎, 嶋田哲郎

  応用生態工学 21 (2) 171 - 179 1344-3755 2019/01 [Refereed][Not invited]
  
• Report on flood disaster in Kinu River, occurred in September, 2015.

  NAKAMURA Futoshi, SHIMATANI Yukihiro, NISHIHIRO Jun, OHTSUKI Kazuaki, ITSUKUSHIMA Rei, YAMADA Hiroyuki

  Ecology and Civil Engineering 応用生態工学会 19 (2) 259 - 267 1344-3755 2017 [Refereed][Not invited]
  
• Neutralization of Lake Onneto, Japan

  Yoichi Oyama, Hiroyuki Yamada, Isamu Wakana, Masaaki Takahash

  Japanese Journal of Limnology 76 (1) 45 - 50 1882-4897 2016/01/31 [Refereed][Not invited]
   

  Lake Onneto has been classified as an acid lake since 1985 however, our latest investigation in 2013 revealed neutralization of the lake. Additionally, previous studies revealed that the neutralization occurred between 2008 and 2012. Water chemistry data generated in the present study implied that the neutralization occurred because of decreased flux from an acid inflowing river, increased flux from a slightly alkaline inflowing river, or a combination of these factors.
• Investigation team for the 2015 flood disaster in Kinu river organized by the president of ecology and civil engineering society: Report on flood disaster in Kinu river, occurred in September, 2015.

  Futoshi Nakamura, Yukihiro Shimatani, Jun Nishihiro, Kazuaki Ohtsuki, Rei Itsukushima, Hiroyuki Yamada

  Ecology and Civil Engineering 119 (2) 259 - 267 1344-3755 2016
• 宮島沼飛来マガン排泄物からの栄養塩類の溶出

  平澤孝介, 山田浩之, 木塚俊和, 中村雅子, 牛山克巳

  湿地研究 日本湿地学会誌編集委員会事務局 6 (1) 25 - 32 2185-4238 2016 [Refereed][Not invited]
  
• 収支の計算残差を用いた渡り性水鳥による過栄養湖への栄養塩負荷量の推定

  木塚俊和, 中村雅子, 牛山克巳, 山田浩之

  湿地研究 日本湿地学会誌編集委員会事務局 6 (1) 33 - 48 2185-4238 2016 [Refereed][Not invited]
  
• CO2 balance of tropical peat ecosystems

  Takashi Hirano, Siti Sundari, Hiroyuki Yamada

  Tropical Peatland Ecosystems 329 - 337 2015/01/01 [Refereed][Not invited]
   

  We reanalyzed long-term field data of CO2 flux, including net ecosystem CO2 exchange (NEE), ecosystem respiration (RE), and soil CO2 efflux (RS) to examine their seasonal and interannual variations for three conditions of disturbance (almost undrained peat swamp forest (PSF), drained PSF, and drained burnt ex- PSF) in a tropical peat area in Central Kalimantan, Indonesia. In addition, we simulated the CO2 flux on a monthly basis using empirical equations shown by our previous studies under four scenarios of seasonal variations in groundwater levels (GWL). The GWL has a large interannual variation in October and November. The rainy season usually begins in October, but the onset is delayed until November in El Niño years, making the interannual variation in CO2 fluxes the largest in these 2 months owing to the large GWL variations. On an annual basis, minimum monthly-mean GWL explained 82 % of interannual variations in NEE for the two PSFs. The linearity suggests that 10-cm drawdown of minimum monthly-mean GWL increases NEE or net ecosystem CO2 emission by 48.5 gC m-2 year-1 from PSF, independently of drainage degree. It can be said that minimum monthly-mean GWL is a practical measure to assess annual NEE of PSF.
• 湖沼生態系の空間情報の取得と評価‐面として阿寒湖の湖底を診る‐

  山田浩之

  北海道の自然 53 43 - 51 2015 [Refereed][Not invited]
  
• 湖沼環境モニタリングのための電動ロボットエアボートの開発

  海津裕, 徳田治展, 山田浩之, 芋生憲司

  農業食料工学会誌 農業食料工学会事務局 77 (6) 477 - 484 2188-224X 2015 [Refereed][Not invited]
  
• 宮島沼における学際的湿地研究と保全に向けた取り組み

  牛山克巳, 山田浩之

  湿地研究 5 3 - 4 2014 [Refereed][Not invited]
  
• Phytometric assessment of alder seedling establishment in fen and bog: Implications for forest expansion mechanisms in mire ecosystems

  T. Nakamura, S. Uemura, K. Yabe, H. Yamada

  Plant and Soil 369 (1-2) 365 - 375 0032-079X 2013 [Refereed][Not invited]
   

  Aims: Rapid forest expansion as a result of anthropogenic activities has been observed in many mires. However, it is unclear which environmental factors are driving this expansion because there have been no systematic investigations into mire-specific tree seedling establishment. This study investigated factors affecting the establishment of common alder (Alnus japonica) in a mire. Methods: We performed seed sowing and seedling transplantation field experiments to examine the factors influencing germination rate, seedling survival, and seedling growth of A. japonica. Results: Germination rate and seedling survival period decreased with increasing water level, and seedling dry weight was reduced at pH < 6.0. Germination rate was also lower in the fen, whereas seedling dry weight was lower in the bog, which could be reasonably explained by the higher water level in the fen and the lower pH in the bog. Conclusions: Our results showed that germination and seedling growth in the fen and bog were each inhibited by different mire-specific conditions: high water level and low pH, respectively. Therefore, seedling establishment could be improved by either lowering the water level in fens, to increase germination rate and survival, or raising the pH in bogs, to increase growth. © 2013 Springer Science+Business Media Dordrecht.
• Effects of fires and drainage on dissolved organic carbon leaching through groundwater flow in tropical peat swamp forests

  S.Sundari, T.Hirano, H.Yamada, K.Kusin, S. Limin

  Proceedings of international workshop on wild fire and carbon management in peat-forest in Indonesia 36 - 42 2013 [Not refereed][Not invited]
  
• Effect Of Groundwater Level On Soil Respiration In Tropical Peat Swamp Forests

  Siti Sundari, Takashi Hirano, Hiroyuki Yamada, Kitso Kusin, Suwido Limin

  Journal of Agricultural Meteorology 68 (2) 121 - 134 1881-0136 2012/09/01 [Refereed][Not invited]
   

  Tropical peatlands store soil carbon constituting up to 15-19% of global peat carbon. That huge carbon pool is presently being disturbed on a large scale by land development and management, and has consequently become vulnerable. Peat degradation occurs most rapidly and massively in Indonesia fs peatlands because of fires, drainage and deforestation of swamp forests. Peat burning releases carbon dioxide (CO2) intensively but occasionally, whereas drainage increases CO2 emissions steadily through accelerated aerobic peat decomposition. Under such circumstances, tropical peatlands might become a huge source of carbon emissions to the atmosphere. Nevertheless, the effects of drainage on the carbon balance of tropical peatland ecosystems are not well understood more field data must be accumulated. Therefore, we measured soil respiration (RS), which is a major source of CO2 efflux, continuously for more than one year using automated chamber systems, with consideration of microtopography, at two sites in Central Kalimantan, Indonesia: undrained and drained peat swamp forests. The RS was determined mainly by local hydrology. In the undrained forest, RS decreased sharply under flooded conditions because of anoxia. In contrast, in the drained forest, with its lower groundwater level (GWL), RS showed a quadratic relationship with GWL and gradually increased as GWL decreased when GWL was lower than about -0.8 m, which was caused chiefly by the enhancement of peat decomposition. These relationships indicate that lowering GWL by drainage increased RS, whereas annual RS was larger in the undrained forest (1347 gC m-2 y-1) than in the drained forest (1225 gC m-2 y-1) in 2005. The difference in annual RS was probably attributable to higher forest productivity in the undrained forest. © 2012, The Society of Agricultural Meteorology of Japan. All rights reserved.
• Changes in nitrogen and base cation concentrations in soil water due to the tree cutting in a wetland alder forest in the Kushiro Wetland, northern Japan

  Yasunori Nakagawa, Takatoshi Nakamura, Hiroyuki Yamada, Futoshi Nakamura

  LIMNOLOGY 13 (1) 27 - 36 1439-8621 2012/04 [Refereed][Not invited]
   

  As part of the Kushiro Wetland Restoration Project, we evaluated the effect of the tree-cutting (February 2003) on soil water chemistry for 3 years in an alder (Alnus japonica) shrubland on the peat soil in the Kushiro Wetland, the largest wetland in Japan. The alder stand was divided into two types; low stature and high stature stands, mean heights being 1.5 and 2.6 m, respectively. The treatment plot with tree cutting and the reference plot measuring 25 m x 25 m each were established in both stands, and a soil incubation experiment was also conducted by trenching the root zone of wetland vegetation in the treatment plots in both stands in the summer of 2004. The tree cutting did not substantially increase the concentrations of ammonium ion (NH4 (+)) and nitrate ion (NO3 (-)) in the soil water, although a gradual and slight increase of NO3 (-) concentration was found after the tree-cutting only in the high stature stand (< 10 mu mol/l). This increase in the NO3 (-) concentration in the high stature stand was probably due to the rhizosphere oxidation of wetland herbaceous vegetation, and was accompanied by the increase of Ca2+ concentration. The soil incubation experiment showed no significant change of the nitrogen concentration, suggesting that inorganic nitrogen was immobilized and NO3 (-) was denitrified intensively in this wetland peat soil. The results of this study suggested that this wetland ecosystem had a high potential to stabilize the soil water chemistry.
• Effects of irrigation on the hydrological and chemical budgets of lake Miyajima-numa in the Ishikari Peatland, northern Japan

  Toshikazu Kizuka, Hiroyuki Yamada, Takashi Hirano

  Ecology and Civil Engineering 15 (1) 45 - 59 1882-5974 2012 [Refereed][Not invited]
   

  Water chemistry deterioration has become increasingly evident at mire pools with agricultural development occurring in pool catchment areas. Improvement of hydrochemical conditions is urgently necessary for the conservation of such mire pools' ecosystems. We investigated the hydrological and chemical budgets of Lake Miyajima-numa, a Ramsar Convention wetland, which is surrounded by paddy fields in Ishikari Peatland, northern Japan, during its ice-free period in 2007-2008. Surface water inflow and outflow via ditches dominate its hydrological budget, respectively constituting 88% of total input and 78% of total output. Similarly, chemical budgets including Ca2+, total nitrogen, and total phosphorus were dominated by ditch inflow and outflow Chemical constituents of the ditch inflow were derived from mineral-rich and nutrient-rich river water supplied to paddy fields as irrigation water. Therefore, the input fluxes of Ca2+, total nitrogen, and total phosphorus were much greater than those of a pristine mire pool. Increased input fluxes of chemical constituents induced by irrigation changed the hydrological and chemical budgets of mire pools, which degraded the water chemistry through eutrophication and other processes.
• Development of unmanned airboat for water-quality mapping

  Yutaka Kaizu, Munetaka Iio, Hiroyuki Yamada, Noboru Noguchi

  BIOSYSTEMS ENGINEERING 109 (4) 338 - 347 1537-5110 2011/08 [Refereed][Not invited]
   

  An unmanned airboat for mapping the water quality of shallow (<1 m) mire pools where aquatic weeds flourish was developed. A differential global positioning system receiver and a global positioning system compass were used as navigation sensors. The airboat was designed for automatic operation. Using the boat, parameters such as temperature, pH, dissolved oxygen, electrical conductivity, turbidity and chlorophyll-a of the water were measured in a 26-ha mire pool in Hokkaido, Japan. To determine the appropriate sampling-grid size, 10-m spacing linear sampling was conducted, and the spatial variability of the mire pool characteristics was determined using a semivariogram. Results from the spherical model fit to the empirical semivariogram revealed spatial fluctuations in the water-quality parameters on the scale of 100-140 m. Because the size of the grid must be smaller than this scale, a second survey of water samples in the pool was carried out using a grid size of 40 m x 40 m. At each target point, a water-quality sensor unit was lowered from the boat. The survey of the entire grid area took approximately 231 min, during which time 130 points were sampled. The precision of the sampling points was within 2.6 m. The maximum speed and yaw rate of the airboat were 1.2 m s(-1) and 48 degrees s(-1), respectively. The resulting maps provided fine-scale distribution of water quality. (C) 2011 IAgrE. Published by Elsevier Ltd. All rights reserved.
• Hydrological and chemical budgets of a mire pool formed on alluvial lowland of Hokkaido, northern Japan

  Toshikazu Kizuka, Hiroyuki Yamada, Takashi Hirano

  JOURNAL OF HYDROLOGY 401 (1-2) 106 - 116 0022-1694 2011/04 [Refereed][Not invited]
   

  Mire pools - permanently water-filled depressions on peatlands - provide important habitats for myriad organisms. Recently, water balance change and eutrophication resulting from agricultural development are increasingly evident in mire pools of alluvial lowlands. Conservation of mire pool hydrochemistry is necessary. We investigated the hydrological and chemical budgets of a pristine mire pool, Akanuma Pool (95,280 m(2) area; 1.8 m mean depth), located in Kushiro Mire in Hokkaido, northern Japan, during its ice-free period (April-November) in 2007-2008. Thereby we elucidated the hydrochemical characteristics of mire pools formed on alluvial lowlands. Surface water inflow and surface water outflow dominated the hydrological budget, respectively representing 18.3 and 20.2 mm day(-1). Groundwater seepage through the pool bottom and surface water inflow mainly supplied the lake water with total nitrogen and Ca(2+). Total phosphorus was supplied mostly by groundwater seepage through the bottom. These chemical constituents were run off from the pool mostly by surface water outflow. The input and output fluxes of water were 16-20 times greater than those of North American mire pools because of Hokkaido's higher values of precipitation minus evapotranspiration (P-En. Moreover, the Ca(2+) input into the Akanuma Pool was several times greater than those reported from North American studies. Alluvial mineral soil under the peat layer supplied large amounts of nutrients and mineral ions including Ca(2+). These results demonstrate that Hokkaido mire pools' hydrochemical characteristics differ greatly from those of pools in North America. Furthermore, each hydrological budget component maintained a constant fraction throughout the two year study period, although the absolute flow rate varied concomitantly with the precipitation level. Maintaining this budget stability is important for the conservation of mire pool hydrochemistry. (C) 2011 Elsevier B.V. All rights reserved.
• 人工湿地処理水が流入する河川における水環境と生物相

  田中祥人, 山田浩之

  応用生態工学 Ecology and Civil Engineering Society 14 (2) 91 - 101 1344-3755 2011 [Refereed][Not invited]
   

  In 2006, the secondary reed bed treatment system has been constructed to treat sewage from milking parlor in the northern Hokkaido. This system which efficiently uses natural purification abilities has got much attention as a waste treatment facility. However, there are only a few studies about the effects of the treated effluent having high environment loads from the system on surrounding lotic environments and their biota. Therefore, we investigate the effects on stream environments and biotic communities having the effluent through biota studies and survival experiments. These experiments were done by using three representative species, that is, oriental weather fish Misgurnus anguillicaudatus, lake prawn Palaemon paucidens, and Jesogammarus jesoensis. The biota of the study area was poor, and a species of the family Chironomidae was dominant, and no fish species was found. The survival rates of experimental animals were higher in the two upstream sections than those of the two downstream sections in which the effluent flow. The survival rates of experimental animals significantly correlated with concentrations of DO and NH₄⁺ , and COD. Moreover, concentrations of DO were lower, and NH₄⁺ and COD were higher in the two downstream sections than those of the two upstream sections. As a result, it appears that the poverty of biota in the two downstream sections has been caused by anoxic conditions and ammonia toxicity due to the effluent of the waste treatment system.
• 北海道大学サクシュコトニ川再生事業後の水環境と魚類相

  山田 浩之

  北海道大学大学院農学研究院邦文紀要 北海道大学大学院農学研究院 31 (2) 79 - 85 1881-8064 2010 [Refereed][Not invited]
   

  In 2004, a restoration project was conducted in the Sakusyukotoni River, a tributary of the Shin River, at Hokkaido University. The water environment and fish assemblage were investigated after the project in 2007. Water quality was good, meeting environmental quality standards, but the assemblages were poor. Only four species were present -ninespine stickleback (Pungitius pungitius), stone loach (Noemacheilus barbatulus toni), shima-ukigori (Gymnogobius opperiens) and dojo loach (Misgurnus anguillicaudatus)- in spite of higher diversity in the main stem, Shin River. In the near future, it might be necessary to manage or restore habitats for lotic biota.
• FACTORS DETERMINING THE EXPANSION OF ALDER FORESTS IN A WETLAND ISOLATED BY ARTIFICIAL DIKES AND DRAINAGE DITCHES

  Yuichiro Shida, Futoshi Nakamura, Hiroyuki Yamada, Takatoshi Nakamura, Nobuhiko Yoshimura, Masami Kaneko

  WETLANDS 29 (3) 988 - 996 0277-5212 2009/09 [Refereed][Not invited]
   

  We examined factors that influence the expansion of alder forests in a wetland isolated by dikes and drainage ditches in northern Japan. Using aerial photographs, airborne laser scanner data, and existing elevation data, we described the spatial distribution and heights of alder forest in 2002 and the spatial distribution in 1977. We also measured water level and water quality in 2002. The mean water level was slightly lower than the ground surface, and water level fluctuation was minimal. The study site was mesotrophic, but salt concentration was high. The alder forest expanded around the area adjacent to the alder forests present in 1977, and the canopy cover ratio increased over a wide area. A generalized linear model suggested that water level and quality and the previous distribution of reproductively mature trees controlled the expansion pattern of the alder forest. A decrease in water level fluctuation promoted initial establishment, while an increase in fluctuation promoted height growth. A decrease in salt concentration or acidity promoted both initial establishment and growth. Flood protection by dikes may change spatial distribution of alder trees by narrowing water level fluctuation, restricting fruit dispersal, and reducing tree mortality.
• Effects of fine sediment accumulation on the redd environment and the survival rate of masu salmon (Oncorhynchus masou) embryos

  Hiroyuki Yamada, Futoshi Nakamura

  LANDSCAPE AND ECOLOGICAL ENGINEERING 5 (2) 169 - 181 1860-1871 2009/07 [Refereed][Not invited]
   

  In recent years, fine sediment, produced by run-off associated with forestry activity and agricultural development that accumulates on riverbeds, has exerted a deleterious influence on lotic ecosystems. This study examined the Oroennukibetsu River, a tributary of the Nukibetsu River, which has been affected by high loads of suspended sediments. Effects of accumulation of fine sediment on the survival rate of masu salmon embryo and also on the redd environment (permeability and intragravel dissolved oxygen concentration) were quantified through a field experiment. Results show that the interchange of DO between intragravel and surface water was not affected directly by permeability or the accumulated fine sediment and that intragravel flow rates can be an important factor controlling embryo survival. A decrease in permeability associated with accumulation of fine sediment lowered the survival rate of embryos by suffocation because the flux of DO that should be supplied to the embryo was severely limited. This situation might be created by the combined effects of an accumulation of fine sediment on the redd and a low DO concentration in the surface water because the DO concentration almost coincided with the intragravel DO.
• 北海道の沖積低地に成立した泥炭地湖沼の水・物質収支の特徴

  木塚 俊和, 山田 浩之, 平野 高司

  日本陸水学会 講演要旨集 日本陸水学会 74 136 - 136 2009
• Measuring hydraulic permeability in a streambed using the packer test

  Hiroyuki Yamada, Futoshi Nakamura, Yasuharu Watanabe, Marie Murakami, Takeshi Nogami

  HYDROLOGICAL PROCESSES 22 (17) 3545 - 3545 0885-6087 2008/08 [Refereed][Not invited]
  
• Effects of agricultural land use on water chemistry of mire pools in the Ishikari Peatland, northern Japan

  Toshikazu Kizuka, Hiroyuki Yamada, Masao Yazawa, Hoi-Hoon Chung

  LANDSCAPE AND ECOLOGICAL ENGINEERING 4 (1) 27 - 37 1860-1871 2008/05 [Refereed][Not invited]
   

  Concomitant with farmland development in the Ishikari Peatland of northern Japan, deterioration of water chemistry has become increasingly evident at mire pools there. Using spatial analysis methods with a geographic information system and a statistical methodology, this study examined the effects of agricultural land use on the pool water chemistry. A water chemistry survey of several pools showed that nitrogen, phosphorus, and suspended-solid concentrations were remarkably higher than those in pools that had been undisturbed or less-disturbed by land-use development. Principal component analysis (PCA) was conducted to summarize water chemistry variables. Correlation analysis was conducted between the principal component (PC) scores and land-use variables to clarify land-use effects. Results of the PCA showed that the water chemistry variances were accounted for by the first two PCs: PC1 included farmland subsurface drainage containing nitrogen, specifically nitrate, and mineral ions; PC2 included farmland surface drainage containing soil particles and ammonium nitrogen. These PC scores were also affected by the number of inflow ditches and the total area of farmland located within the drainage catchment of inflow ditches leading to the pools. Results suggest that farmland subsurface and surface drainage water flowing into the pools degraded the water chemistry. The extent of the effects of drainage water depended on agricultural practices such as fertilizer application and paddy-field puddling (i.e., mechanical homogenization of water-saturated soil). Accordingly, water chemistry of the study pools was affected by agricultural practices and by the amount of farmland in the drainage basin, engendering eutrophication, and the deterioration of water chemistry. Therefore, preservation of water chemistry necessitates changes in agricultural practices, such as improving fertilizer application methods, along with measures related to land-use planning such as changing the drainage ditches' flow direction.
• Effects of fine sediment accumulation on the redd environment and the survival rate of eyed embryos of Sakhalin taimen (Hucho perryi) in mountain streams of northern Hokkaido. Ecol. Civil Eng. 11 (1), 29-40, 2008

  Hiroyuki Yamada, Yôichi Kawaguchi, Kaneaki Edo, Eishige Komiyama

  Ecology and Civil Engineering 11 (1) 29 - 40 1882-5974 2008 [Refereed][Not invited]
   

  We examined effects of fine sediment on embryo survival rate and on redd environments of an endangered species, Sakhalin taimen (Hucho perryi). Sediment accumulation, permeability, water quality and embryo survival were quantified at the redds in mountain streams in northern Hokkaido, Japan, and their correlations were assessed. The results indicated that the survival rate was negatively correlated with dissolved oxygen concentration. However, the direct effects of fine sediment on the embryo were not clarified because the accumulations were low in those streams. Moreover, results clarified that accumulations lower the interchange ability of redd water and conduction of heat, despite the low accumulation level. Further research must investigate the fine sediment effects associated with heat flux. © 2008, Ecology and Civil Engineering Society. All rights reserved.
• 石狩泥炭地宮島沼の水文化学環境

  木塚俊和, 山田浩之, 平野高司

  環境情報科学論文集 環境情報科学センター 22 493 - 498 0389-6633 2008 [Refereed][Not invited]
  
• 研究者から現場へ 細粒土砂汚染とは何か? 河川管理に求められることは?

  山田 浩之

  河川 日本河川協会 63 (3) 81 - 83 0287-9859 2007/03 [Refereed][Not invited]
  
• 間隙動物の生息場所に適した砂州内環境の実験的研究

  竹門康弘, 田中武志, 山田浩之, 池淵周一

  京都大学防災研究所年報 京都大学防災研究所 48 (B) 901 - 918 0386-412X 2006 [Refereed][Not invited]
  
• Measuring hydraulic permeability in a streambed using the packer test

  H Yamada, F Nakamura, Y Watanabe, M Murakami, T Nogami

  HYDROLOGICAL PROCESSES 19 (13) 2507 - 2524 0885-6087 2005/08 [Refereed][Not invited]
   

  Permeability of a streambed is an important factor regulating nutrient and oxygen availability for aquatic biota. In order to investigate the relationship, an accurate permeability should be measured. However, it is difficult to measure permeability in a coarse gravel bed using a conventional permeability test. Moreover, turbulent flow may occur in coarse bed material, and then deviations from Darcy's law do occur. Thus, permeability calculated following Darcy's law may be overestimated under turbulent flow conditions and should be corrected. The packer test can be used in highly permeable gravel beds. We developed a field method applicable to a gravel bed using the packer test and derived an equation adopting a law of turbulent flow to study the problems under any type of flow condition. The accuracy of the equation was examined using a laboratory flume with a gravel bed. The results suggested that permeability calculated from Hvorslev's equation is overestimated for turbulent flow. In contrast, our equation, developed here, could evaluate permeability accurately under any type of flow condition. Copyright (c) 2005 John Wiley & Sons, Ltd.
• Effects of pasture development on the ecological functions of riparian forests in Hokkaido in northern Japan

  F Nakamura, H Yamada

  ECOLOGICAL ENGINEERING 24 (5) 539 - 550 0925-8574 2005/05 [Refereed][Not invited]
   

  In the summer, the forest canopy lowers the water temperature, which is very important for anadromous fish, and its population density is significantly lower in grassland streams. Leaf litter and terrestrial invertebrates are the critical food resources for stream organisms. In a basin where the riparian forest is preserved, but other areas have been cut, the amount of leaf litter is almost equivalent to that in an intact natural basin. The annual input of terrestrial invertebrates falling into the forested reaches was 1.7 times greater than that in the grassland reaches, and fish biomass was significantly less in the grassland reaches. In-stream large woody debris creates storage sites for organic and inorganic matter and enhances habitat diversity for aquatic biota. However, the volume and number of large wood pieces decreased significantly with pasture development, because it clears the riparian forests and covers the riverbanks with grass. Fine sediment is a prominent by-product of agricultural development and adversely impacts periphyton productivity, the density and diversity of aquatic invertebrates, fish feeding, fish spawning and egg survival. We also examine the adequate width of a riparian buffer if it is to be able to satisfy its ecological functions. (c) 2005 Elsevier B.V. All rights reserved.
• Limnological characteristics of an oxbow lake in a lower reach of the Shibetsu River in Hokkaido Island, Japan

  NOZAKI Kentaro, KIHIRA Masaki, YAMADA Hiroyuki, KISHI Daisuke, NUNOKAWA Masanori, KAWAGUCHI Yôichi

  Ecology and Civil Engineering 応用生態工学会 7 (2) 165 - 172 1344-3755 2005 [Refereed][Not invited]
   

  Limnological characteristics of a shallow oxbow lake (maximum depth about 2 meters) were investigated in a lower reach of the Shibetsu River in Hokkaido Island, Japan. Water temperatures, under-water light attenuation coefficients, and concentrations of dissolved oxygen, nitrogen, phosphorus and chlorophyll-a were measured on July 21 and November 17 in 2001 and July 30 in 2002. Water temperature varied among sampling stations and depths, ranging from 10°C to 24°C in July, while all measurements were constant at about 5°C in November. Dissolved oxygen concentrations at all stations on all sampling dates were 10 mg L^-1 or more. Its maximum concentration reached 25 mg L^-1 with 250% saturation at the lake bottom on July 21 in 2001. The depths of sampling stations that obtained high concentrations of dissolved oxygen were between 50 cm and 60 cm. Water temperatures at these depths ranged from 10°C to 15°C, which were lower than surface water by 5°C to 10°C. A large filamentous green alga, Spirogyra sp., propagated in these depths. Concentrations of dissolved nitrogen in lake water varied from 11 μg L^-1 to 250 μg L^-1, which declined in July at all stations and depths. Concentrations of PO₄^3--P showed a range from 7 μg L^-1 to 14 μg L^-1, not so different among stations, depths and sampling dates. Particulate phosphorus and chlorophyll-a concentrations were approximately constant between 33 μg L^-1 and 35 μg L^-1 and 10 μg L^-1 and 13 μg L^-1, respectively. The concentrations of total phosphorus and chlorophyll-a on 21 July 2001 indicate that trophic status of the oxbow lake is in meso-eutrophic conditions. Under-water light attenuation coefficients (k) ranged from 1 m^-1 to 2 m^-1 at all stations and sampling dates. These values are comparable to the maximum value for eutrophic lakes with waterbloom of phytoplankton. However, because chlorophyll-a concentrations in this oxbow lake were lower than those in the eutrophic lakes, under-water light seemed to be attenuated by non-living particles and dissolved organic matter. Therefore, there is a possibility that the oxbow lake is in dystrophic conditions. These results suggested that the limnological characteristics of the oxbow lake were greatly different from those of the main channel of the Shibetsu River. It is believed that the oxbow lake maintains the characteristics of a lowl-and marsh, which was former landscape of the lower region of the Shibetsu River watershed.
• 細粒土砂汚染の実態とその対策

  山田浩之

  農業土木北海道 27 69 - 77 2005 [Refereed][Not invited]
  
• Habitat preference of Ephemera strigata for oviposition site - influence of gravel bar structure and tree canopies -

  Tanaka Takeshi, Yamada Hiroyuki, Takemon Yasuhiro, Ikebuchi Shuichi

  Abstracts of the Annual Meeting of the Ecological Society of Japan 日本生態学会 51 (0) 247 - 247 2004 

  河川に生息するモンカゲロウ（Ephemera strigata）などの水生昆虫類では，砂礫堆上流端に位置する淵尻の瀬頭に集中的に産卵する行動が知られている．このような産卵場所選択性は，砂礫堆の河床間隙水の透水性や溶存酸素濃度などの物理化学特性と関係していると考えられる．しかしながら，産卵場所の環境条件と産卵個体数の関係や産下された卵やふ化幼虫生存率などを実証的に示した研究は行われていない．一方，近年各地の河川で生じている砂礫堆の樹林化やツルヨシの繁茂によって，このような産卵適地が減少しつつあると懸念されている．
  そこで，本研究では，産卵雌数に対する瀬-淵，樹冠の有無，岸際の状態，微生息場所環境条件として透水係数，動水勾配および河床間隙水流速の影響を調べた．また，モンカゲロウ卵野外孵化実験を通して，卵の孵化率・死亡率に対する河床間隙水域の物理化学的環境の影響を調べた．その結果，モンカゲロウは，上空が樹冠で覆われず，岸際が植生に覆われていない裸地部分を産卵場所に選ぶことが確認された．また，産卵場所と瀬-淵の相対的位置関係を分析した結果，産卵の集中地点は，必ずしも瀬頭とは限らず，瀬中央付近でも集中的に産卵することがわかった．次に，微生息場所条件の分析の結果，瀬の産卵雌数は，ばらつきは大きいものの動水勾配との間に有意な正の相関が認められた（r=0.61, p<0.01）．これに対し，透水係数，間隙水流速との間には有意な相関は認められなかった（透水係数r=-0.17, 間隙流速r=0.25,n.s.）．
  さらに，野外孵化実験の結果，モンカゲロウ卵は産卵場所に選ばれていない場所でも孵化できることが確認できたが，死亡率は，間隙水流速が小さく，DO供給量が小さくなる砂礫堆内陸側や下流側において大きくなる傾向が認められた．本研究の結果は，「モンカゲロウの選択する産卵場所条件は，間隙流速が大きく豊富な溶存酸素が供給される間隙水域に対応しており，卵や孵化した若齢幼虫の生存率を高めるのに役立っている」という仮説を支持している．
• Ecological aspects of Hirosato restoration area in the Kushiro Mire: Impacts of artificial disturbances on the relationship between distribution of vegetation and hydrochemical environments. Ecol. Civil Eng. 7(1), 53-64, 2004

  Takatoshi Nakamura, Hiroyuki Yamada, Yasunori Nakagawa, Yuki Kasai, Futoshi Nakamura, Tsunao Watanabe

  Ecology and Civil Engineering 7 (1) 53 - 64 1882-5974 2004 [Refereed][Not invited]
   

  Deteriorations of vegetation and hydrochemical environments were examined in the Hirosato restoration area on the margins of Kushiro Mire, where agricultural land use and a drastic increase of alder forest have influenced the ecosystem for the last past half-century. The vegetation was classified into seven types, where the meadow types dominate in the pasture area and the alder or fen types are distributed in the mire area. A following Canonical Correspondence Analysis shows two major results: 1) A vegetation gradient from the mire area to the pasture area corresponding to the obvious lowering of the groundwater level, 2) A vegetation gradient from the fen types to the alder types in correspondence to the lowering of the groundwater level and to the decrease of phosphorous concentration coupled with the increase of nitrogen concentration in soil water. The intense decrease of the groundwater level in the pasture area due to the diversion of the neighboring river has probably changed the mire vegetation into meadow vegetation, indicating that serious deteriorations have been introduced artificially. In the mire area, the distribution of the alder forest was mostly affected by hydrological regime in flooding, yet artificial influences could not be specified. © 2004, Ecology and Civil Engineering Society. All rights reserved.
• Ecological aspects of Hirosato restoration area in the Kushiro Mire: Effect of pasture developments and river improvements on hydrochemical environments of groundwater Ecol. Civil Eng. 7(1), 37-51, 2004

  Hiroyuki Yamada, Takatoshi Nakamura, Yasunori Nakagawa, Yuichirou Kamiya, Futoshi Nakamura, Tsunao Watanabe

  Ecology and Civil Engineering 7 (1) 37 - 51 1882-5974 2004 [Refereed][Not invited]
   

  The present study was conducted at Hirosato area in Kushiro Mire, where the aim of the nature restoration project by the Ministry of Environment is to restore pasture areas back to original mire. In order to understand the effects of pasture development and river improvement, the groundwater environment was investigated in pasture and surrounding areas. The results revealed that the mire area exhibited a transitional groundwater system from fen to bog. In comparison to the mire area, the average groundwater table in the pasture was lower with higher fluctuations. The pasture was developed along the Kyu-Setsuri River where the groundwater conditions are regulated by the river water level. This was greatly reduced by the diversion of the original course through artificial dikes. Thus the groundwater in the pasture was rapidly drained into the Kyu-Setsuri River. Moreover, Na+, Cl-, Mg2+ concentrations of groundwater were significantly lower in the pasture than in the mire area, suggesting a drainage of these nutrients from the pasture through the groundwater. In addition, the Ca2+ concentration of the groundwater in the pasture area was twice as high as in the mire area. This can be attributed to remains of calcium carbonate from pasture soil amendment, although about 30 years have passed since the pasture was developed. Furthermore, the river diversion by artificial dikes conducted almost 70 years ago has been influencing the groundwater system and its water quality. In order to restore the original groundwater environment, an increase of the water level of the Kyu-Setsuri River and the treatment of soil amendments are necessary. © 2004, Ecology and Civil Engineering Society. All rights reserved.
• Changing Patterns of Water Quality Associated with Hyporheic Flow of a Gravel Bar in the Kamo River

  H. Yamada, T. Tanaka, Y. Takemon, S. Ikebuchi

  DPRI Annuals of Disaster Prevention Research Institute 京都大学防災研究所 47 (C) 263 - 272 0386-412X 2004 [Refereed][Not invited]
  
• アイガモ農法が水田の生物相・水質に及ぼす影響

  山田浩之, 河崎昇司, 矢沢正士

  環境情報科学論文集 18 495 - 500 2004 [Refereed][Not invited]
  
• 釧路湿原の現状と自然再生事業の概要

  中村 太士, 中村 隆俊, 渡辺 修, 山田 浩之, 仲川 泰則, 金子 正美, 吉村 暢彦, 渡辺 綱男

  保全生態学研究 日本生態学会 8 (2) 129 - 143 1342-4327 2003/12 [Refereed][Not invited]
   

  Kushiro Mire, a marsh located near the mouth of the Kushiro River, is suffering from the cumulative effects of pollution caused by land-use development in the watershed. A high wash load is of particular concern and accounts for approximately 95% of the total suspended sediment load that flows into the marsh. Research has found that turbid water floods the margins of the marsh; this is due to riverbed aggregation in a channelized stream reach that provides agricultural drainage. An analysis of Cs-137 concentrations determined that the rate of fine sediment deposition was approximately three to eight times higher in the channelized reach than in a reach of the natural river. This rapid sediment deposition has lowered groundwater levels and enriched the nutrient content of the marsh soil. Consequently, woody species are rapidly invading the margins of the marsh, causing concern about a vegetation shift from reed-dominated marsh to woodland To address the physical and biological changes that are taking place in Kushiro Mire, various restoration projects have been planned and are being implemented under the Kushiro Mire Conservation Plan. Two examples of projects in the Kushiro Mire Conservation Plan are a forest restoration near Takkobu Lake and a wetland restoration of a crane habitat. Fine sediments and nutrients have been accumulating in Takkobu Lake because of agricultural development and soil erosion in the uplands. The number of aquatic species in the lake has also been decreasing. An environmental assessment was undertaken in collaboration with "Trust Sarun", a non-profit organization, and sites were selected for conservation and restoration work. A larch forest was purchased to prevent it from being clear-cut and thus increasing sediment loading in the lake. The forest will be restored to its natural state. In addition, the Ministry of Environment in the Hirosato District acquired a wetland restoration site that was originally designated as an "ordinary area," i.e., the least regulated area of a national park. The restoration site is an abandoned agricultural field with an old drainage system developed in the 1960 s; it is an important breeding habitat for red-crowned cranes (Grus japonesis) Based on a preliminary investigation, and under careful supervision to avoid disturbing the cranes, soil excavation and seeding experiments have been undertaken.
• 河床間隙水域の物理化学的特性とモンカゲロウの産卵場所選択

  田中武志, 竹門康弘, 山田浩之, 池淵周一

  京都大学防災研究所年報 京都大学防災研究所 46 (B) 867 - 873 0386-412X 2003 [Refereed][Not invited]
  
• 河畔緩衝帯の生態学的意義と草地開発が水辺の生態系に及ぼす影響

  山田浩之, 中村太士

  日本草地学会誌 日本草地学会 48 (6) 548 - 556 0447-5933 2003 [Refereed][Not invited]
   

  河畔緩衝帯とは、いわゆる陸域と水域の移行帯であり、河畔林や湿地によって構成される水辺域を指し、水辺に生息する生物の生息場、森林から供給される物質の滞留や分解の場として機能する。なかでも河畔林は、河川の流水や攪乱、浸透流に特徴づけられる地形・土壌条件に対応して群落を構成し、日射遮断や落葉・落下昆虫・倒木などの供給、細粒土砂・栄養塩の保持などの多様な機能を持つことが知られている。こうした水辺域の構造や生態的機能については、1970年代以降、米国を中心に多くの研究成果が発表されているが、国内における研究事例はきわめて少ない。一方、日本では高度経済成長期以降の大規模な農地開発に伴う河川改修や森林伐採、湿地の開拓により、河畔緩衝帯が急激に減少した。加えて、河畔緩衝帯の減少に伴う河川水温の上昇や河川への土砂供給量の増加、河川・地下水汚染、河川生物の生息環境の悪化が懸念されている。そのような経緯から、最近では自然環境に対する負荷を軽減することを目的とした"環境保全型農業"が展開されつつあり、さらには河畔緩衝帯の復元が試みられるようになった。
• Effect of fine sediment deposition and channel works on periphyton biomass in the Makomanai River, northern Japan

  H Yamada, F Nakamura

  RIVER RESEARCH AND APPLICATIONS 18 (5) 481 - 493 1535-1459 2002/09 [Refereed][Not invited]
   

  The Makomanai River in northern Japan has suffered considerable fine sediment deposition, especially in a reach where channel works have been constructed. Four contiguous reaches were examined for deposition of fine sediment and the effects of such on periphyton biomass; two of the reaches had channel works and bank protection, respectively, the other two being unmodified. The influence of fine sedimentation on epilithic periphyton biomass (chlorophyll a weight and organic matter weight) and the autotrophic index (AI), and the relationship between these and hydraulic variables was emphasized. Fine sediment increased, chlorophyll a decreased and AI increased in the reach with channel works and in the unmodified reach immediately upstream. In addition, the current velocity and Froude number tended to decrease in the reach with channel works. Correlation analysis showed that with an increase in fine sediment, chlorophyll a decreased and non-living periphyton, indicated by AI, increased. It was also confirmed that fine sediment increased with an increase in weight of periphyton organic matter and decreased with an increase in current velocity or Froude number. These results suggest that accumulation of fine sediment, which substantially reduces light penetration for photosynthesis under low current velocity conditions, results in lowered periphyton levels. The channel works have lowered the current velocity, thus promoting deposition of fine sediment and an increase in non-living periphyton. Copyright (C) 2002 John Wiley Sons, Ltd.
• Experimental Study on Benthic Fish Habitats in an Ice Covered River

  T. Nogami, Y. Watanabe, M. Nakatsugawa, F. Nakamura, K. Kamura, H. Yamada, S. Tsuchiya, K. Watanabe, H. Iwase

  Ice in the Environment: Proc. of the 16th IAHR International Symposium on Ice, Dunedin, International Association of Hydraulic Engineering and Research 104 - 110 2002 [Refereed][Not invited]
  
• Effects of Dams and Channel Works on Riverine Habitat in Mountainous Streams

  F. Nakamura, H. Yamada, N. Shin

  Proc. of the 1st International Symposium on Conservation of Mountain Ecosystems 2002 [Not refereed][Not invited]
  
• Field Experiments for Mitigation Benthic Fish Habitats in the Makomanai River

  T. Nogami, Y. Watanabe, M. Nakatsugawa, F. Nakamura, K. Kamura, H. Yamada, S. Tsuchiya, K. Watanabe, H. Iwase

  River Flow 2002 541 - 549 2002 [Refereed][Not invited]
  
• Influence of stream alteration on the abundance and distribution of benthic fish. Ecol. Civil Eng. 4(2), 133-146, 2001

  Keizo Watanabe, Futoshi Nakamura, Kunishige Kamura, Hiroyuki Yamada, Yasuharu Watanabe, Susumu Tsuchiya

  Ecology and Civil Engineering 4 (2) 133 - 146 1882-5974 2001 [Refereed][Not invited]
   

  The influence of stream alteration on abundance of benthic fish was examined hierarchically by both reach and channel unit scales, in the Makomanai River, in Sapporo City, northern Japan. Study sections of 2 km were settled in bank protection, natural, and channel works courses. The density of Cottus nozawae in the channel works reach was significantly lower than that in the natural and bank protection reaches, whereas the abundance of Noemacheilus barbatulus toni was not different among the three reaches. The density of C. Nozawae was positively correlated with the abundance of boulders and loose stones, probably because interstitial spaces on river bed provide refuge and critical habitat components for living and spawning. River bed in the channel works reach was covered by fine sediment and with few loose stones, resulting in reduced interstitial spaces and thus a low density of C. nozawae. Within the channel unit, the density of C. Nozawae in riffles was significantly higher than that in pools, which could be attributed to abundant boulders and loose stones in riffles. A reduced tractive force in the stream caused by check dams and bed stabilization works not only promotes the deposition of pebble-sized stones and the creation of a stable channel bed during a flood, but also traps fine sediment during low-flow periods. These physical mechanisms changes, in association with the channel works, greatly altered the habitat required for C. nozawae. © 2001, Ecology and Civil Engineering Society. All rights reserved.
• Hydraulic conductivity of substrate and openwork gravel rate associated with fine sediment depositon in mountain streams, southern Hokkaido. Ecol. Civil Eng. 4(2), 109-120, 2001

  Marie Murakami, Hiroyuki Yamada, Futoshi Nakamura

  Ecology and Civil Engineering 4 (2) 109 - 120 1882-5974 2001 [Refereed][Not invited]
   

  The fine sediment (< 2 mm) effects on percentage of openwork gravel and hydraulic conductivity were studied at 5 small catchments in southwestern Hokkaido, Japan in 1999. We also examined the influence of land use on substrate and hydraulic conductivity. Bed material was sampled using the frozen core technique and hydraulic conductivity was measured using the packer test. The percentage of openwork gravel and hydraulic conductivity decreased with an increase in proportion of fine sediment. Especially the weight percentage of 0.125 to 1.0 mm showed the most negative correlations with these parameters, which indicates that fine sediment filling the interstitial space of gravel bed is responsible to the decreases in these parameters. The stream containing great amount of fine sediment had extensive agricultural development in its catchment area. Thus these substrata differences among the streams were attributable to the surface soil erosion and bank erosion at agricultural fields. Fine sediment progressively accumulated in streambed materials under normal flow conditions, resulting in a decrease in openwork gravels and hydraulic conductivity. Losing the interstitial space of gravel bed will have detrimental effects on benthic fish and invertebrate and other aquatic biota that require these habitats in their life cycles. In order to maintain healthy stream ecosystem, we need to pay more attention on the conditions of fine sediment and bed materials, and to seek effective measures to prevent fine sediment production and deposition. The sampling methods applied in this study were proved to be useful to investigate fine sediment and hydraulic conductivity of the bed materials. © 2001, Ecology and Civil Engineering Society. All rights reserved.
• 微細砂堆積による河床透水性の低下がサクラマス卵の生残率に及ぼす影響

  山田浩之, 中村太士

  日本林学会北海道支部論文集 49 112 - 114 2000 [Refereed][Not invited]
  
• 真駒内川における微細砂堆積と付着藻類の現存量に関する研究

  山田浩之, 中村太士

  日本林学会北海道支部論文集 48 136 - 138 1999 [Refereed][Not invited]
  
• 西表島におけるミナミトビハゼの分布と微小環境

  池辺裕子, 中本純一, 山田浩之

  南紀生物 40 (1) 71 - 78 1998 [Refereed][Not invited]
  
• 河川水辺の植生の実態とその制限要因に関する研究

  山田浩之, 河原長美

  環境システム研究 Japan Society of Civil Engineers 24 673 - 679 0915-0390 1996 [Not refereed][Not invited]
   

  Many projects to create rivers rich in nature are pushed on. However, the aimed conditions of nature are not always clarified. The vegetation of rivers plays important roles in habitation of various animals. Therefore, as the first step towards clarifying the desirable vegetation, this study focuses on the actual conditions of vegetation and influences of both hydrological regime and population density along rivers on the number of plant communities and species. The vegetation on riverside lands was investigated mainly based on the nationwide survey of the vegetation on riverside lands carried by the Ministry of Construction. The vegetation on riverside lands is greatly different river by river and showed a tendency to increase in rivers with higher coefficient of regime and to be influenced by human activities.

MISC

• 書誌情報：「身近な水の環境科学 第 2 版」

  山田浩之  湿地研究  (13)  2023
• 全周魚眼カメラを用いたマガン個体数自動カウントへの挑戦

  山田 浩之  野鳥  84-  (5)  16  -19  2019/06  [Not refereed][Not invited]
  
• 北海道大学サクシュコトニ川の小さな自然再生

  山田 浩之  北海道ネーチャーマガジンモーリー  (52)  22  -25  2019/06  [Not refereed][Not invited]
  
• 阿寒カルデラにおける火山噴火によって同時に細分された湖沼群の生態遷移系列

  若菜勇, 田村由紀, 山田浩之, 尾山洋一, 大原雅  日本生態学会大会講演要旨(Web)  66th-  2019
• 阿寒湖沼群におけるマリモの分布と水環境

  若菜勇, 田村由紀, 尾山洋一, 山田浩之  藻類  63-  (1)  2015
• 阿寒湖沼群における水環境と水生植物群落の多様性

  若菜勇, 尾山洋一, 田村由紀, 山田浩之, 和田恵治, 長谷川健, 大原雅  日本植物学会大会研究発表記録  79th-  2015
• 宮島沼の水環境動態 −水環境空間情報の取得−

  山田浩之, 横山諒, 海津裕  みんなでマガンを数える会25周年記念誌  2014  [Not refereed][Not invited]
  
• 河原と間隙水域母なる川の胎内として

  山田浩之  北海道ネーチャーマガジンモーリー  (32)  34  -35  2013  [Not refereed][Not invited]
  
• 景観を守る

  朝日新聞道内版記事  2011/10/12  [Not refereed][Not invited]
  
• サロベツミズゴケ湿原における炭素収支へのササ侵入の影響

  泉弥希, 清水真理子, 山田浩之, 梶原直哉, 石倉究, 延岡裕太, 平野高司, 波多野隆介  日本土壌肥料学会講演要旨集  57-  (57)  294  -294  2011/08/08  [Not refereed][Not invited]
  
• 河川改修の影響を受けたサロベツ湿原ドームドボッグからの地下水溶存態炭素の流出

  平岡亮太郎, 山田浩之, 平野高司  応用生態工学会研究発表会講演集  15th-  7-8  2011  [Not refereed][Not invited]
  
• サロベツ湿原における泥炭地からの地下水と溶存態炭素の流出

  山田浩之, 平岡亮太郎, 田中祥人, 平野高司  日本農業気象学会全国大会講演要旨  2011-  61  2011  [Not refereed][Not invited]
  
• サロベツ湿原のエネルギー収支

  大下亮平, 平野高司, 山田浩之, 高橋英紀  日本農業気象学会全国大会講演要旨  2010-  38  2010  [Not refereed][Not invited]
  
• 19 Ecological responses to anthropogenic alterations of gravel-bed rivers in Japan, from floodplain river segments to the microhabitat scale: a review

  Futoshi Nakamura, Yôichi Kawaguchi, Daisuke Nakano, Hiroyuki Yamada  Developments in Earth Surface Processes  11-  501  -523  2007  

  We describe the relationship between disturbance regimes, the life history traits of aquatic and riparian organisms, and effects of human activity, using Japanese gravel-bed rivers in the Asia Monsoon Belt as an example. The consideration of various roles of disturbance in creating a spatial and temporal pattern of habitats is made hierarchically at three spatial scales. Segment scale is the largest, represented by a braided river landscape on an alluvial fan. Riparian tree species direct their life history strategies to survive in the shifting habitat dynamics. Reservoirs constructed at the fan apex regulate flood disturbances and seasonal flow variation, changing the dynamic state to a monotonous, static habitat structure. Intermediate reach-scale structures are represented by pool-riffle sequences, gravel bars, secondary and abandoned channels and oxbow lakes. We focused particularly on the lateral variation of the entire valley floor and its stream channel, which provide critical habitats for spawning, hatching, rearing, wintering, feeding and dwelling as well as flow refugia for fish and macroinvertebrates. Bed instability resulting from an increased tractive force due to channel straightening and its impact on macroinvertebrate communities is also discussed. Finally, the smallest scale is the microhabitat seen as the interstitial spaces in gravel beds used by salmonid and benthic fish for all or some of their life stages. Sediment control dams and gravel mining in rivers and floodplains is causing gravel-size sediment starvation, whereas the introduction of fine sediment is substantially increased following land-use development. © 2008 Elsevier B.V. All rights reserved.
• イトウの聖地と人間の生活に影響を及ぼす川の泥

  HTBイチオシ  2004/06/10  [Not refereed][Not invited]
  
• For conservation and restoration of basin ecosystems: assessment on the ecological function of river morphology and its application

  竹門康弘, 山田浩之, 池淵周一, 山田浩之  Research report of Water Resources Research Center  (24)  69  -72  2004  [Not refereed][Not invited]
  
• 流域土地利用に伴う微細砂の生産, 流出形態特性と河川生物相に及ぼす影響評価手法に関する研究(平成12年度砂防学会ワークショップ成果概要報告)

  山田浩之  砂防学会誌  54-  (6)  83  -84  2002  [Not refereed][Not invited]
  
• 川底の生き物と細粒土砂と流域

  山田浩之  自然共生研究センター ARRC NEWS  4-  (5)  2002  [Not refereed][Not invited]
  

Books etc

• 水辺を守る: 湿地の保全管理と再生 (シリーズ〈水辺に暮らすSDGs〉)

  日本湿地学会, 高田 雅之, 朝岡 幸彦, 太田 貴大, 大畑 孝二, 佐伯 いく代, 富田 啓介, 藤村 善安, 皆川 朋子, 矢﨑 友嗣, 山田 浩之 (Editor第7章 テクノロジーを生かした調査)
  朝倉書店 2023/04 (ISBN: 9784254185539)
• 湿地の科学と暮らし-北のウェットランド大全-

  矢部和夫, 山田浩之, 牛山克巳 (Supervisor)
  北海道大学出版会 2017/04
• 釧路叢書

  山田 浩之 (Contributorさまざまなセンサで面として阿寒湖を診る)
  釧路市教育委員会 2017/03
• 図説日本の湿地

  山田 浩之 (Contributor湿原の再生)
  朝倉書店 2017 178-179
• Peatland in Southeast Asia

  Osaki M (ContributorCO2 balance of tropical peat ecosystems)
  Springer 2016
• 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 (Contributor湿原生態系と大気との間のCO2交換)
  北海道大学図書刊行会 2014 85-88
• 北海道の気象と農業

  日本農業気象学会北海道支部 (Contributor湿原の役割)
  北海道新聞社 2013 112-116
• Gravel-Bed Rivers 6 From Fromprocess understanding to river restoration

  H. Habersack, H. Pie ́gay, M. Rinaldi (Joint workEcological responses to anthropogenic alterations of gravel-bed rivers in Japan, from river-floodplain segments to microhabitat scale: A review)
  Elsevier 2008
• 自然再生：生態工学的アプローチ

  亀山章, 倉本宣, 日置佳之 (Contributor湿原)
  ソフトサイエンス社 2005 64-82
• 森林の科学−森林生態系科学入門−

  中村太士, 小池孝良 (Contributor細粒土砂汚染が河川生物相に及ぼす影響を調べる)
  朝倉書店 2005 114-115
• 自然再生−釧路から始まる

  環境省 (Contributor自然と対話しながら, 自然の回復力の手助け)
  （社）自然環境共生技術協会 2004 119-121

Presentations

• 自律航行ボートを用いたアオコ・マイクロプラスチック回収に関する基礎的研究

  楊逸群, 山田浩之, 吉田浩平

  大沼研究発表会  2024/02
• 全方位カメラモニタリングシステムと画像処理を用いたマリモ動態の解析

  奈良竜征, 山田浩之, 尾山洋一, 中山恵介

  大沼研究発表会  2024/02
• 鳥類モニタリンクのための水面模倣バードバスの開発とその誘引効果  [Not invited]

  吉田 彩乃, 山田 浩之, 北野 雅人, 佐野 祐士, 宮田 弘樹, 三輪 隆

  第３回北海道の応用生態工学  2024/01
• 浮葉植物の繁茂する湖沼での自動水環境モニタリンクシステムの開発とその調査事例  [Not invited]

  山本泰平, 山田浩之, 吉田磨

  第３回北海道の応用生態工学  2024/01
• 生物・環境モニタリングのデジタル変革を目指して  [Invited]

  山田浩之

  環境アセスメント協会技術セミナー  2023/11
• UAV・VRカメラを用いた湿地生態系モニタリングシステムの開発

  山田浩之, 鈴木透, 中村隆俊, 田開寛太郎

  応用生態工学会第26回全国大会  2023/09
• 鳥類モニタリングのための水面模倣バードバスの開発とその誘引効果  [Not invited]

  吉田彩乃, 山田浩之, 北野雅人, 佐野祐士, 宮田弘樹, 三輪隆

  応用生態工学会第26回全国大会  2023/09
• 全方位画像撮影システムを用いた阿寒湖のマリモ動態モニタリング

  奈良竜征, 山田浩之, 尾山洋一, 中山恵介

  応用生態工学会第26回全国大会  2023/09
• 湖底マッピングのための水中撮影用ロボットボートの開発

  相田拓郎, 山田浩之, 尾山洋一

  応用生態工学会第26回全国大会  2023/09
• 環境教育の目的に適合したVR教材の開発と実践に向けて

  田開寛太郎, 山田浩之, 鈴木透, 中村隆俊

  日本環境教育学会第34回年次大会  2023/08
• 阿寒湖北部における沈水植物の生育状況変化

  尾山洋一, 鈴木芳房, 山田浩之

  水草研究会第44回全国集会  2023/08
• 調査・教育用VRコンテンツの作成を目的とした湿地生態系のUAVモニタリング手法の検討

  鈴木透, 山田浩之, 中村隆俊, 田開寛太郎

  日本生態学会第70回全国大会  2023/03
• 設置型レーザ照射式カラス類防除装置のねぐらにおける効果検証

  今井健裕, 山田浩之

  日本鳥学会 2022 年度大会  2022/11
• 自律航行ボートを用いた湖底環境マッピングシステムの開発  [Not invited]

  相田拓郎, 山田浩之, 尾山洋一

  ELR2022つくば大会  2022/09
• VRカメラを用いた水圏生態系モニタリングシステムの開発  [Not invited]

  奈良 竜征, 山田 浩之, 尾山 洋一

  ELR2022つくば大会  2022/09
• 「応用生態工学」におけるデータペーパー  [Invited]

  山田浩之

  ELR2022つくば大会  2022/09
• 幌向再生地における再湿潤化泥炭地の温室効果気体の動態

  岡野臣泰, 吉田磨, 山田浩之, 矢部和夫

  日本湿地学会 第 14 回釧路大会  2022/09
• 湿原再生地におけるUAV空撮画像と機械学習を用いた植物種の自動同定

  田中爽太, 山田浩之, 矢部和夫

  日本湿地学会第14回大会  2022/09
• センシング技術を用いた生物モニタリングの試みー水鳥，魚類，湿原植生を対象としてー  [Invited]

  山田浩之

  リバーフロント財団第18回「川の自然再生」セミナー  2021/12
• 声紋の画像解析によるコオロギ類の鳴き声検出法の開発  [Not invited]

  中岡佳祐, 山田浩之

  応用生態工学会第24回全国大会  2021/09
• レーザ照射式カラス類追い払い装置の開発とその効果検証  [Not invited]

  今井健裕, 細川友輔, 山田浩之

  応用生態工学会第24回全国大会  2021/09
• 近赤外・熱赤外カメラ空撮による湿原再生地の植生・環境モニタリング  [Not invited]

  田中爽太, 山田浩之, 矢部和夫

  日本湿地学会第13回大会  2021/09
• UAV・VRカメラを用いた湿原植生調査の有効性

  中村隆俊, 磯野隆弘, 山田浩之, 鈴木透

  2021/03
• UAV・VRカメラを用いた湿原の効率的な植生調査法の検討

  鈴木透, 山田浩之, 中村隆俊

  日本生態学会第68回全国大会  2021/03
• 声紋分析による北海道に生息するバッタ目の鳴き声の分類

  中岡佳祐, 山田浩之

  日本生態学会第68回全国大会  2021/03
• UAV・VRカメラを用いた湿原植生調査法の有効性評価

  中村隆俊, 磯野隆弘, 山田浩之, 鈴木透

  日本生態学会第67回大会  2020/03
• UAV・VRカメラを用いた湿原の植生調査法の開発

  鈴木透, 山田浩之, 中村隆俊

  日本生態学会第67回大会  2020/03
• 遠隔操作カメラと画像処理を用いたマガン自動監視システムの開発  [Not invited]

  山田浩之, 安部晋吾, 牛山 克巳, 嶋田 哲郎

  日本湿地学会2019年度大会  2019/09
• 全周魚眼スマートフォンカメラと画像処理を用いた魚類の遠隔モニタリング  [Not invited]

  山中登生, 山田浩之, 藤本泰文

  日本湿地学会2019年度大会  2019/09
• VR カメラを用いた湿地景観のアーカイブ化手法の検討  [Not invited]

  若松拓夢, 山田浩之

  日本湿地学会2019年度大会  2019/09
• UAV・VR カメラを用いた湿原植生調査の試み  [Not invited]

  山田浩之, 鈴木透, 中村隆俊, 若松拓夢

  日本湿地学会2019年度大会  2019/09
• スイートコーンの収穫適期推定に関する研究  [Not invited]

  新谷奈津光, 岡田啓嗣, 山田浩之, 鮫島良次

  日本農業気象学会2019年全国大会  2019/03
• 遠隔操作監視カメラシステムと画像処理を用いたマガン飛来数の推定  [Not invited]

  山田浩之, 小西哲也, 横山 諒, 牛山克己, 高橋佑亮, 嶋田哲郎

  第13回伊豆沼・内沼研究集会  2019/02
• スマートフォンを用いた淡水魚介類の遠隔モニタリング  [Not invited]

  藤本泰文, 山田浩之, 山中登生, 倉谷忠禎, 嶋田哲朗

  2018年度日本魚類学会年会  2018/10
• 遠隔操作デジタルカメラを用いた湿地生物モニタリングの課題  [Not invited]

  山田浩之, 小西哲也, 横山諒, 安部晋吾, 山中登生

  日本湿地学会 2018年度大会  2018/09
• 無線通信全周魚眼カメラと画像解析を用いたトンボ類のモニタリング  [Not invited]

  安部晋吾, 山田浩之, 嶋田哲郎

  日本湿地学会 2018年度大会  2018/09
• 自動撮影全周魚眼カメラを用いたトンボ類の遠隔モニタリング  [Not invited]

  山田浩之, 安部晋吾, 上田紘司, 嶋田哲郎

  ELR2017名古屋  2017/09
• 全周魚眼スマートフォンカメラを用いた水生生物の遠隔モニタリング  [Not invited]

  藤本泰文, 嶋田哲郎, 山田浩之

  ELR2017名古屋  2017/09
• 遠隔監視システムと画像処理を用いたマガン飛来数の推定  [Not invited]

  山田浩之, 横山諒, 九間啓士朗

  ELR2017研究集会「ロボット・UAV・ネットワークカメラを用いた湿地生態系の監視と管理」  2017/09
• 全天空監視システムの開発と画像解析を用いたマガン飛来数の推定  [Not invited]

  山田浩之, 横山諒, 九間啓士朗

  日本鳥学会自由集会「ロボットやセンサ，ドローンを活用した湿地生態系の監視・管理システムの構築」  2017/09
• 全天空遠隔監視システムと画像解析を用いたマガン飛来数のモニタリング  [Not invited]

  山田浩之, 横山諒, 牛山克巳, 嶋田哲郎

  日本湿地学会2017年度大会  2017/09
• 無線通信360度カメラを用いたマガンモニタリング  [Not invited]

  山田浩之, 九間啓士朗, 村田祥子

  石狩川流域 湿地・水辺・海岸ネットワーク設立記念フォーラム  2017/03
• 全天空監視システムの開発と画像解析を用いたマガン飛来数の推定  [Not invited]

  山田浩之, 九間啓士朗, 村田祥子

  第11回伊豆沼・内沼研究集会  2017/02
• ちょっと変わったドローンの活用法  [Not invited]

  山田 浩之

  日本鳥学会自由集会「ドローンを使った鳥類調査」  2016/09
• UAVを使ったちょっと変わった調査法  [Not invited]

  山田浩之

  応用生態工学会自由集会「応用生態工学でUAVを活用する！」  2016/09
• 無線通信360度カメラを用いたマガンモニタリング  [Not invited]

  山田浩之, 九間啓士朗, 村田祥子

  日本湿地学会2016年度大会  2016/08
• Dissolved organic carbon leaching through groundwater flow in tropical peatlands  [Not invited]

  S. Sundari, H. Yamada, T. Hirano

  International Workshop. "Deforestation of Tropical Peatdevelopment of Deforestation Standard and Congress Indonesia Peat Association"  2012/09
• Groundwater Flow Reversal at a Raised Bog in Sarobetsu Mire, Mid Latitude Peatland  [Not invited]

  H. Yamada, R. Hiraoka, Y. Tanaka, T. Hirano

  IAH (International Association of Hydrogeologists) 2012 Congress  2012/09
• Dissolved organic carbon leaching through groundwater flow in tropical peatlands  [Not invited]

  S. Sundari, H. Yamada, T. Hirano

  Conference on Agricultural Biodiversity and Sustainability 2012  2012/08
• Effects of agricultural activity on temporospatial variation of water quality in a bog pool, lake miyajima-numa, northern Japan  [Not invited]

  M. Yokoyama, H. Yamada, Y. Kaizu

  9th INTECOL (International Association for Ecology) International Wetland Conference  2012/06
• Groundwater Flow Reversal at a Raised Bog in Sarobetsu Mire, Mid Latitude Peatland  [Not invited]

  H. Yamada, R. Hiraoka, Y. Tanaka, T. Hirano

  9th INTECOL (International Association for Ecology) International Wetland Conference  2012/06
• サロベツ湿原の蒸発散  [Not invited]

  平野高司, 大下亮平, 山田浩之, 高橋英紀

  日本農業気象学会北海道支部大会  2011/11
• 河川改修の影響を受けたサロベツ湿原ドームドボッグからの地下水溶存態炭素の流出  [Not invited]

  平岡亮太郎, 山田浩之, 平野高司

  応用生態工学会第15回金沢大会  2011/09
• 自律航行ボートを用いた宮島沼の水質空間分布調査  [Not invited]

  横山諒, 山田浩之, 海津裕, 野口伸

  応用生態工学会第15回金沢大会  2011/09
• サイドスキャンソナー搭載魚群探知機を用いた水生植物群落の分類と現存量推定  [Not invited]

  山田浩之, 藤島洸, 若菜勇

  応用生態工学会第15回金沢大会  2011/09
• サロベツ湿原における泥炭地からの地下水と溶存態炭素の流出  [Not invited]

  山田浩之, 平岡亮太郎, 田中祥人, 平野高司

  日本農業気象学会2011年大会  2011/03
• Comparison of groundwater dissolved organic carbon among three different tropical peatlands in Central Kalimantan・Indonesia  [Not invited]

  Siti Sundari, Hiroyuki Yamada, Takashi Hirano

  日本生態学会第58回大会  2011/03
• 自由集会「泥炭湿原の炭素動態の解明 サロベツ湿原を例として」人為的攪乱を受けたボッグの水文過程と炭素流出  [Not invited]

  山田浩之, 平岡亮太郎, 田中祥人, 平野高司

  日本生態学会第58回大会  2011/03
• ウトナイ湖北西岸における高茎湿生草原の分布を規定する水文化学条件の解明  [Not invited]

  金井紀暁, 山田浩之, 矢部和夫

  日本生態学会大津大会  2011/03
• 空中写真判読による1975 年と2009 年の間に起こったウトナイ湖とその周辺地域の植生変動の解析  [Not invited]

  金井紀暁, 矢部和夫, 金子正美, 山田浩之

  日本写真測量学会北海道支部第29回学術講演会  2011/02
• ウトナイ湖北岸における河川改修・湖沼水位管理が氾濫源の水文環境と植生に与える影響  [Not invited]

  平岡亮太郎, 山田浩之, 矢部和夫

  応用生態工学会第14回札幌大会  2010/09
• レジャー用サイドスキャンソナーを用いた阿寒湖の水生植物分布調査  [Not invited]

  藤島洸, 山田浩之, 中西一洋, 若菜勇

  応用生態工学会第14回札幌大会  2010/09
• 河川改修の影響を受けたサロベツ泥炭地ドームドボッグでの地下水溶存態有機炭素の動態  [Not invited]

  山田浩之, 田中祥人, 平岡亮太郎, 平野高司

  応用生態工学会第14回札幌大会  2010/09
• サロベツ湿原のエネルギー収支  [Not invited]

  大下亮平, 平野高司, 山田浩之, 高橋英紀

  日本農業気象学会  2010/03
• Hydrological and chemical budgets of Akanuma Pool in Kushiro Mire, northern Japan  [Not invited]

  T. Kizuka, H. Yamada, T. Hirano

  American Geophysical Union Fall Meeting 2009  2009/12
• サロベツ湿原のエネルギー収支  [Not invited]

  大下亮平, 平野高司, 山田浩之, 高橋英紀

  日本農業気象学会北海道支部2009年大会  2009/12
• 浅層湖沼の水質空間分布調査の問題点と自動観測ボートの開発  [Not invited]

  山田浩之, 木塚俊和, 中西一洋, 海津裕, 平野高司, 野口伸

  応用生態工学会第13回埼玉大会  2009/09
• グーグルアース・マップを用いた若手研究者・技術者間交流と情報提供の試み  [Not invited]

  山田浩之, 河内香織, 久加朋子, 山下慎吾, 渡辺恵三

  応用生態工学会第13回埼玉大会  2009/09
• サロベツ湿原における泥炭の分解過程に関する研究  [Not invited]

  鬼頭宏幸, 山田浩之, 平野高司

  農業環境工学関連学会2009年合同大会  2009/09
• 北海道の沖積低地に成立した泥炭地湖沼の水・物質収支の特徴  [Not invited]

  木塚俊和, 山田浩之, 平野高司

  日本陸水学会第74回大会  2009/09
• サロベツ湿原のドームドボッグにおける地下水のリバース現象  [Not invited]

  山田浩之, 田中祥人, 平野高司

  日本陸水学会第74回大会  2009/09
• サロベツ湿原の地下水ＤＯＣ生成要因とササ化がそれに及ぼす影響  [Not invited]

  田中祥人, 山田浩之, 平野高司

  日本陸水学会第74回大会  2009/09
• 釧路湿原南部における主要草本種の養分利用特性  [Not invited]

  中村隆俊, 植村滋, 矢部和夫, 山田浩之

  日本生態学会  2009/03
• 釧路湿原南部におけるハンノキの大きさ・現存量・形態と年輪成長・およびその分布を調節する要因  [Not invited]

  矢部和夫, 中村隆俊, 山田浩之, 石川幸男, 植村滋, 金子正美

  日本生態学会  2009/03
• 釧路湿原におけるハンノキ侵入が泥炭の生成・分解に与える影響  [Not invited]

  泉谷一樹, 岡田啓嗣, 浦野慎一, 山田浩之, 矢部和夫, 伊藤亨

  日本農業気象学会北海道, 東北支部合同大会  2008/11
• サロベツ湿原ボッグドームの地下水浸透特性  [Not invited]

  田中祥人, 山田浩之, 平野高司

  日本農業気象学会北海道, 東北支部合同大会  2008/11
• 石狩泥炭地宮島沼の水文化学環境  [Not invited]

  木塚俊和, 山田浩之, 平野高司

  環境情報科学センター環境研究発表会  2008/11
• 釧路湿原南西部における堤防の設置が地下水流動・化学性に及ぼす影響  [Not invited]

  山田浩之, 川口哲平, 中村隆俊, 矢部和夫, 河内邦夫

  応用生態工学会第12回研究発表会  2008/09
• 北海道北部の人工湿地水質浄化施設設置による河川生態系の改善効果  [Not invited]

  田中祥人, 山田浩之, 井上京, 加藤邦彦

  応用生態工学会第12回研究発表会  2008/09
• 農業・自然流域間における泥炭地湖沼の水収支の比較  [Not invited]

  木塚俊和, 山田浩之, 平野高司

  応用生態工学会第12回研究発表会  2008/09
• 釧路湿原南西部における堤防の設置が地下水流動・化学性に及ぼす影響  [Not invited]

  山田浩之, 川口哲平, 中村隆俊, 矢部和夫, 河内邦夫

  日本陸水学会第73回大会  2008/05
• 泥炭地に形成された小湖沼の水・物質収支  [Not invited]

  木塚俊和, 山田浩之, 平野高司

  日本陸水学会第73回大会  2008/05
• Effects of Levee Construction on Hydro-chemical Conditions in the Kushiro Mire, Northern Japan  [Not invited]

  H. Yamada, T. Kawaguchi, T. Nakamura, K. Yabe

  American Geophysical Union Fallmeeting 2007  2007/12
• Effects of Levee Construction on Groundwater Flow in Kushiro Mire, Northern Japan  [Not invited]

  T. Kawaguchi, H. Yamada, T. Nakamura, K. Yabe

  American Geophysical Union Fallmeeting 2007  2007/12
• 泥炭地湖沼である釧路湿原赤沼の水文環境  [Not invited]

  木塚俊和, 山田浩之, 平野高司

  陸水物理研究会研究発表会2007年度(第29回)滋賀大会  2007/12
• 釧路湿原におけるハンノキ林拡大と蒸発散量の関係  [Not invited]

  岡田啓嗣, 泉谷一樹, 荒岡憲一, 浦野慎一, 山田浩之, 矢部和夫

  陸水物理研究会研究発表会2007年度(第29回)滋賀大会  2007/12
• 湿原の蒸発散量に与えるハンノキ林拡大の影響 ― 釧路湿原の観測事例 ―  [Not invited]

  佐坂ゆかり, 岡田啓嗣, 泉谷一樹, 荒岡憲一, 浦野慎一, 山田浩之, 矢部和夫

  日本農業気象学会北海道支部2007年大会  2007/11
• 釧路湿原における築堤が水文化学環境に及ぼす影響  [Not invited]

  川口哲平, 山田浩之, 工藤博之, 中村隆俊, 矢部和夫

  応用生態工学会第11回研究発表会  2007/09
• 農業活動が泥炭地湖沼の水文環境に及ぼす影響  [Not invited]

  木塚俊和, 山田浩之, 平野高司

  応用生態工学会第11回研究発表会  2007/09
• 差圧センサーを用いた河床間隙水域の動水勾配計測手法の開発  [Not invited]

  山田浩之

  応用生態工学会第11回研究発表会  2007/09
• 釧路湿原におけるハンノキ林とフェンの土壌呼吸の比較  [Not invited]

  泉谷一樹, 岡田啓嗣, 佐坂ゆかり, 浦野慎一, 山田浩之, 矢部和夫

  農業環境工学関連学会2007年合同大会  2007/09
• ハンノキ侵入による湿原の環境変化  [Not invited]

  岡田啓嗣, 佐坂ゆかり, 泉谷一樹, 浦野慎一, 山田浩之, 矢部和夫

  農業環境工学関連学会2007年合同大会  2007/09
• 石狩泥炭地における農業的土地利用が小湖沼水質に及ぼす影響  [Not invited]

  木塚俊和, 山田浩之, 矢沢正士

  日本陸水学会第72回大会  2007/09
• 差圧センサーを用いた湿原の動水勾配計測方法の開発と釧路湿原での使用例  [Not invited]

  山田浩之, 木塚俊和, 川口哲平

  日本陸水学会第72回大会  2007/09
• 釧路湿原ハンノキ林の分布・動態・更新#2 実生による更新は可能か？  [Not invited]

  中村隆俊, 植村滋, 矢部和夫, 高田恵利, 山田浩之

  日本生態学会  2007/03
• 釧路湿原ハンノキ林の分布・動態・更新#3 ハンノキの形・現存量・年輪成長と立地環境  [Not invited]

  矢部和夫, 中村隆俊, 植村滋, 石川幸男, 山田浩之

  日本生態学会  2007/03
• ハンノキ侵入が湿原の蒸発散に及ぼす影響  [Not invited]

  佐坂ゆかり, 岡田啓嗣, 浦野慎一, 泉谷一樹, 竹村慶子, 山田浩之, 矢崎友嗣

  日本農業気象学会北海道支部2006年大会  2006/12
• 湿原の蒸発散量に及ぼすハンノキ侵入の影響  [Not invited]

  佐坂ゆかり, 岡田啓嗣, 浦野慎一, 泉谷一樹, 竹村慶子, 山田浩之, 矢崎友嗣

  第9回陸水学会北海道支部大会  2006/11
• 釧路湿原温根内地区における堤防の設置が地下水環境に及ぼす影響  [Not invited]

  工藤博之, 山田浩之, 中村隆俊, 矢部和夫, 中村太士

  第55回日本森林学会北海道支部大会  2006/11
• 植生の異なる湿原土壌の地中熱環境について  [Not invited]

  岡田啓嗣, 矢崎友嗣, 浦野慎一, 山田浩之, 佐坂ゆかり, 矢部和夫

  農業環境工学関連学会2006年合同大会  2006/09
• Effects of agricultural land use on water quality of mire pools in the Ishikari Peatland, Northern Japan  [Not invited]

  T. Kizuka, H. Yamada, M. Yazawa

  International conference on ecological restoration in East Asia  2006/06
• Effects of agricultural land use on the distribution of freshwater fish in mire pools of the Ishikari Peatland, Northern Japan  [Not invited]

  H. Yamada, K. Tamai, T. Kizuka

  International conference on ecological restoration in East Asia  2006/06
• ハンノキの混在する湿原植生の蒸発散特性に関する研究  [Not invited]

  佐坂ゆかり, 岡田啓嗣, 矢崎友嗣, 山田浩之, 浦野慎一

  日本農業気象学会2006年春季大会  2006/04
• Ecosystem restoration at multiple scales in Kushiro Mire - Analysis of present status and Practice  [Not invited]

  H. Yamada, T. Nakamura, T. Yazaki, Y. Nakagawa, F. Nakamura

  2nd EAFES International Congress  2006/03
• 釧路湿原広里再生事業区におけるハンノキの分布と環境  [Not invited]

  中村隆俊, 仲川泰則, 山田浩之, 中村太士

  第53回日本生態学会新潟大会  2006/03
• 釧路湿原におけるハンノキ侵入の影響について  [Not invited]

  岡田啓嗣, 矢崎友嗣, 佐坂ゆかり, 山田浩之, 矢部和夫, 浦野慎一

  日本農業気象学会北海道支部一般研究発表会,  2005/11
• 石狩泥炭地における土地利用と小湖沼水質の関係  [Not invited]

  木塚俊和, 山田浩之, 矢沢正士

  応用生態工学会第9回大会  2005/10
• 北海道北部山地小河川における細粒土砂堆積がイトウ産卵床環境に及ぼす影響  [Not invited]

  山田浩之, 河口洋一, 小宮山英重

  応用生態工学会第9回大会  2005/10
• 石狩泥炭地における土地利用と小湖沼水質の関係  [Not invited]

  木塚俊和, 山田浩之, 矢沢正士

  農業土木学会平成17年度大会講演会  2005/08
• アイガモ農法が水田の生物相および水質環境に及ぼす影響  [Not invited]

  山田浩之, 河崎昇司, 矢沢正士

  環境情報科学研究発表会  2004/11
• 釧路湿原におけるハンノキ林の伐採が周辺環境に及ぼす影響  [Not invited]

  中島範雄, 浦野慎一, 山田浩之, 矢崎友嗣, 宮内翔平, 岡田啓嗣

  日本農業気象学会北海道支部大会  2004/11
• Habitat selection for oviposition site in Ephemera strigata in relation to physicochemical environment of hyporheic zone  [Not invited]

  T. Tanaka, H. Yamada, Y. Takemon, S. Ikebuchi

  1st EAFES International Congress  2004/10
• 自然再生事業区域釧路湿原広里地区における湿原環境の実態−酪農草地化および河川改修が湿原地下水環境に及ぼす影響−  [Not invited]

  山田浩之, 中村隆俊, 仲川泰則, 中村太士, 渡辺綱男

  農業土木学会第53回北海道支部研究発表会  2004/10
• 河床間隙水域の物理化学的特性とモンカゲロウ卵の死亡率の関係  [Not invited]

  田中武志, 山田浩之, 竹門康弘, 池淵周一

  応用生態工学会第8回大会  2004/10
• アイガモ農法が水田の生物相・水質に及ぼす影響  [Not invited]

  河崎昇司, 山田浩之, 矢沢正士

  農業土木学会大会講演会  2004/09
• 石狩泥炭地内小湖沼の水質影響要因に関する研究  [Not invited]

  木塚俊和, 矢沢正士, 山田浩之

  農業土木学会大会講演会  2004/09
• モンカゲロウの産卵場所選択性−砂礫堆と樹冠の影響−  [Not invited]

  田中武志, 山田浩之, 竹門康弘, 池淵周一

  第51回日本生態学会釧路大会  2004/08
• イトウの聖地と人間の生活に影響を及ぼす川の泥, HTBイチオシ  [Not invited]

  山田 浩之

  2004/06
• 賀茂川中流域における砂州間隙水の動態と水質変化機構  [Not invited]

  山田浩之, 田中武志, 竹門康弘, 池淵周一

  京都大学防災研究所研究発表講演会  2004/02
• 釧路湿原広里地区における地下水環境の実態および湿原再生手法の検討  [Not invited]

  山田浩之, 中村隆俊, 仲川泰則, 濱裕人, 中村太士, 渡辺綱男

  応用生態工学会第７回大会  2003/10
• 渓流におけるモンカゲロウの産卵場所選択性〜とくに河床間隙水域の物理化学的特性との関係について〜  [Not invited]

  田中武志, 山田浩之, 竹門康弘, 池淵周一

  応用生態工学会第７回大会  2003/10
• 釧路湿原広里地区における植生と環境の対応関係  [Not invited]

  中村隆俊, 山田浩之, 仲川泰則, 笠井由紀, 中村太士, 渡辺綱男

  応用生態工学会第７回大会  2003/10
• 釧路湿原広里地域における植生と水位・水質環境の空間的分布―釧路湿原自然再生事業のための事前調査の結果―  [Not invited]

  仲川泰則, 山田浩之, 中村隆俊, 神谷雄一郎, 谷口拓之, 渡辺綱男, 中村太士

  環境科学会2003年会  2003/09
• Linking Aquatic Entomology and River Environmental Management via River Bed Structure  [Not invited]

  Y. Takemon, T. Tanaka, H. Yamada, S. Ikebuchi

  Korea-Japan Joint Conference on Applied Entomology and Zoology  2003/06
• 河床間隙水域の物理化学的特性とモンカゲロウの産卵場所選択  [Not invited]

  田中武志, 竹門康弘, 山田浩之, 池淵周一

  土木学会関西支部研究発表会  2003/05
• 航空機レーザー測量を用いた釧路湿原ハンノキ林の樹高推定と分布域の環境条件  [Not invited]

  松原健二, 山田浩之, 中村隆俊, 宮作尚弘, 神谷雄一郎, 渡辺綱男, 中村太士

  第114回日本林学会大会要旨集  2003/03
• Effect of fine sediment deposition and influence of river structure on lotic biota in northern Japan  [Not invited]

  H. Yamada, F. Nakamura

  VIII International Congress of Ecology  2002/08
• 河床における細粒土砂の堆積が河川生物相に及ぼす影響  [Not invited]

  山田浩之, 中村太士

  渓畔林研究会  2001/10
• 河床における微細砂の堆積がサクラマス産卵床・付着藻類現存量に及ぼす影響  [Not invited]

  山田浩之

  砂防学会ワークショップ  2001/10
• パッカー法を用いた砂礫河床における透水係数の測定  [Not invited]

  山田浩之, 中村太士, 渡邊康玄, 村上まり恵, 野上毅

  応用生態工学研究会第5回研究発表会  2001/09
• Measuring hydraulic permeability in a streambed using packer test  [Not invited]

  H. Yamada, Y. Watanabe, T. Nogami, M. Murakami, F. Nakamura

  5th International Conference on Geomorphology  2001/08
• 微細砂堆積による河床透水性の低下がサクラマス産卵床に及ぼす影響  [Not invited]

  山田浩之, 中村太士

  応用生態工学研究会第4回研究発表会  2000/10
• 土地利用の異なる河川における底質及び透水性の違い  [Not invited]

  村上まり恵, 山田浩之, 中村太士

  応用生態工学研究会第4回研究発表会  2000/10
• 真駒内川における微細砂堆積と付着藻類の現存量に関する研究  [Not invited]

  山田浩之, 中村太士

  応用生態工学研究会第3回研究発表会  1999/09
• 真駒内川における改修工事が底生魚類の生息場環境に及ぼす影響  [Not invited]

  渡辺恵三, 中村太士, 新目竜一, 渡辺正順, 山田浩之

  応用生態工学研究会第3回研究発表会  1999/09
• 流況特性を用いた植物群落の予測に関する基礎的研究  [Not invited]

  山田浩之, 河原長美

  土木学会中国支部研究発表会  1997/06
• 河辺植生の実態と制限要因  [Not invited]

  山田浩之, 河原長美

  土木学会中国支部研究発表会  1996/06

Association Memberships

• 日本泥炭地学会   日本湿地学会   日本陸水学会   日本生態学会   応用生態工学会   Ecology and Civil Engineering Society   

Research Projects

• 釧路湿原シラルトロ湖におけるヒシ拡大の原因解明と環境修復法の確立

  日本学術振興会：科学研究費助成事業 基盤研究(C)

  Date (from‐to) : 2022/04 -2026/03 

  Author : 吉田 磨
• Technology development of ecosystem VR archives using UAV for education and research DX promotion

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2022/04 -2025/03 

  Author : 山田 浩之
• 生物相モニタリングの自動化と活用に関する研究

  株式会社竹中工務店：産学連携協同研究

  Date (from‐to) : 2022/04 -2024/03 

  Author : 山田浩之
• 泥炭採掘跡地の再湿潤化による群落、水質、および温室効果気体生成の初期変遷の追跡

  日本学術振興会：科学研究費助成事業 基盤研究(C)

  Date (from‐to) : 2019/04 -2023/03 

  Author : 矢部 和夫, 山田 浩之, 吉田 磨

   

  １）群落再生：ボッグ種の導入を実験する4つの重点区域では，遮水後，ECとｐH は，ボッグ種に好適な水質を保っていた．また水位はミズゴケ類の生育可能な-20～-30cmであったが，ミズゴケ類の生育状況は乾燥期の5月から8月に悪く，9月以降回復するパターンであった．再生地内の表層地下水は、再生地の勾配に沿って，北東方向に向かう流れとなっており、遮水効果は、遮水壁側ほど顕著になっていた。したがって，遮水壁は一定の効果があることを確認できた．水深10cmのときの表層（0～-10ｃｍ）の含水率は70-80％だったが，水深20 cmでは45-50％であり，乾燥が導入したミズゴケの生育を抑制したと推測される。オオイヌノハナヒゲを中心とした植生面積は，2017年3400 ｍ２から2020年7800 ｍ２と2.3倍に拡大した．重点区域への初期導入種は重点区域間で生存率の差が出たが，成長していた． ２）温室効果気体の動態と水環境評価: フィールド内80測点で地下水の水環境集中観測を行った。イオンクロマトグラフを用いて各種イオン成分の分析を行った結果、カルシウムイオンと硫酸イオンの値が高かった。低pHは硫酸イオンに関係していると考えられる。地下水溶存温室効果気体の解析を進める予定が、地下水に泥の混入が多く温室気体測定用試料の採取ができなかったため、地下水の管の整備も進めた. ３）環境・群落の時空間モニタリング: 再生地でUAVを用いたRGB・熱赤外カメラ，マルチスペクトルカメラによる面情報の時間変化を把握した．5月から11月にかけて月1回の頻度で，再生地全体の空撮を実施した．それにより得られた画像のモザイク化，オルソ化の手法を検討し，再生地全体のRGBとNIRのオルソ画像，熱赤外のモザイク画像，NDVI（正規化植生指数）画像と地形を示すDSM（数値表層モデル）の作成に成功した．
• Development of mire vegetation survey method using the UAV and VR technology with omnidirectional camera

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

  Date (from‐to) : 2018/04 -2021/03 

  Author : Yamada Hiroyuki

   

  We have developed a new, labor-saving, non-invasive vegetation survey method using UAV and VR cameras. In this process, two types of UAV systems were produced so that users can choose the system according to the survey cost. In addition, we established a procedure for creating a flight plan that emphasizes efficiency and safety. We demonstrated the effectiveness and practicality of this method by conducting field tests in several wetlands. By comparing the cost with the conventional method, it was found that this method is more labor-saving than the conventional method.
• フィールド調査とロボット・センサ･通信技術をシームレスに連結する水域生態系モニタリングシステムの開発

  環境省：環境研究総合推進費

  Date (from‐to) : 2016 -2018 

  Author : 海津裕
• Evaluation of the carbon balance of tropical peat ecosystems using a tower-flux network

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

  Date (from‐to) : 2013/04 -2017/03 

  Author : Hirano Takashi, ITOH Akihiko

   

  In tropical peat ecosystems in Southeast Asia, including an undrained peat swamp forest, a drained swamp forest, a burned ex-swamp forest, a rubber plantation etc., various CO2 or carbon fluxes were measured, and CO2 emissions through oxidative peat decomposition, ecosystem-scale CO2 balance and carbon leaching (dissolved organic carbon: DOC) through runoff were quantified. As a result, 1) the sensitivity of peat decomposition to groundwater level, 2) a large amount of peat decomposition in a peat plantation, and 3) the contribution of peat decomposition to total subsidence, were mainly elucidated. The field data of CO2 fluxes were used to customize a terrestrial ecosystem process model (VISIT) to tropical peat ecosystems. Using the model, the carbon balance of tropical peatlands in whole Borneo Island was evaluated to be 1.8±12.9 Mt C ha-1 yr-1, which suggests that the tropical peat ecosystems have already changed to a carbon source.
• Development of an unmanned surface vehicle for lake environmental monitoring

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

  Date (from‐to) : 2012/04 -2015/03 

  Author : KAIZU Yutaka, YAMADA Hiroyuki

   

  An autonomous, electric-powered, unmanned airboat was developed for the efficient measurement of depth and water quality of inland water bodies. Compared with a gasoline engine, an electrical brushless motor was lighter, cleaner, quieter, less vibrating, and more controllable. The maximum distance and maximum operation period were estimated by measuring the vessel speed and power consumption with respect to the rotational speeds of the propellers. The accuracies of staying controlled on fixed points and in line following control were evaluated as the basic performance test of the boat. The results showed that the accuracies were sufficient enough for creating a map of the entire lake. Field trials were done in Churui Bay, Lake Akan, and Lake Onneto in Hokkaido, Japan. Depth maps and various water quality maps were successfully drawn for these lakes using the prototype.
• 湿原湖沼水環境モニタリングのためのスカウト機能を備えたロボットボートの開発

  文部科学省：科学研究費補助金（基盤（C））

  Date (from‐to) : 2012 -2014 

  Author : 海津裕
• Automatic classification of sidescan sonar image for mapping aquatic macrophyte distribution

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

  Date (from‐to) : 2011 -2013 

  Author : YAMADA Hiroyuki

   

  Many aquatic macrophytes have been endangered. Therefore, it is necessary to develop the monitoring techniques urgently. In this study, a classification technique using sidescan sonar images (backscattering strength) was developed for mapping of the macrophyte distribution. As a result of various classifications, it was found that accurate classification was provided by difference of backscatter strength between seasons which was indicating the macrophytes phenology. It was considered that the accurate monitoring of aquatic macrophyte in a wide area was enabled by the classification technique.
• Control and analysis for formation of water environment using spatial information

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(A))

  Date (from‐to) : 2008 -2012 

  Author : Noboru NOGUCHI, 平野 高司, 波多野 隆介, 山田 浩之, 石井 一暢, 海津 裕

   

  (抄録なし)
• 西岡公園における湿原環境に関する研究

  札幌市：受託研究

  Date (from‐to) : 2010/12 -2011/02 

  Author : 山田 浩之
• Mechanism of formation and continuity of fen meadow communities at a lowland peat-forming mire in Pacific coast, northern Japan

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2009 -2011 

  Author : YABE Kazuo, ISHIKAWA Yukio, YAMADA Hiroyuki, KANEKO Masami

   

  This study aims to clarify the mechanism of formation and continuity of the fen meadow communities, which have to conserve because they were rapidly decreased. Fen meadow communities rapidly decreased between 1975 and 2009, since Alnus forest replaced them. The rapid change of communities suggests that fen meadow communities are temporally formed by the degradation of fens owing to the decline of water level begun before 1960. Hydrochemical conditions which sustain fen meadow communities were intermediate in water level between Alnus forest and fens, and low concentrations of major minerals and nitrogen, indicating fen meadow communities are low productive. Water of rivers in this area contained much minerals and nutrients. On the other hand, after flooding of Utonai lake in August 2010, the concentrations of minerals and nutrients fen meadow areas did not rise. Accordingly, water supply by increasing water level of Utonai pond would be most effective, because this method can maintain oligotrophic condition.
• 低価格帯スキャンソナー搭載魚群探知機の水生植物モニタリングへの適用とその課題

  WEC：WEC応用生態研究助成

  Date (from‐to) : 2009 -2010 

  Author : 山田 浩之
• Carbon balance of a peatland ecosystem under the changing environment

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2008 -2010 

  Author : 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.
• 寒冷地での実用化をめざした人工湿地浄化システムの確立

  農林水産省：先端技術を活用した農林水産研究高度化事業

  Date (from‐to) : 2006 -2009 

  Author : 井上 京
• 地下水浸透流解析を用いた放棄農地の湿原再生手法の検討

  委託研究

  Date (from‐to) : 2009
• 河床間隙水域の3次元水・物質フローモニタリング手法の実用化とその評価法の構築

  河川環境管理財団：河川整備基金助成事業

  Date (from‐to) : 2007/05 -2008/06 

  Author : 山田 浩之
• Assessment of the reduction of carbon dioxide emission from tropicalpeatlands through environmental restoration

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(B))

  Date (from‐to) : 2006 -2008 

  Author : Takashi HIRANO, 谷 宏, 井上 京, 島田 沢彦, 山田 浩之

   

  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。
• Study for the mechanism of community change from fen to alder forest caused by artificial disturbances

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(B))

  Date (from‐to) : 2005 -2007 

  Author : Kazuo YABE, 浦野 慎一, 中村 隆俊, 山田 浩之, 植村 滋, 石川 幸男, 岡田 啓嗣

   

  This study was done at Onnenai and Hirosato in southern and east parts from abanks running in the center of Kushiro mire. Present study reveals water tables in alder forest were more stable than fens, while most of hydrochemical conditions of alder forests were very similar to fens. Moreover, the growth of alder was inhibited by the increase of acidity. Suppression of growth by acidity means alders cannot grow in bog area. Transplanted juvenile seedlings of alder (5 to 10 cm high) could survive and grew vigorously on small hummocks in fens, where seedlings can grow in neutral pH and escape ...
• 流域スケール空間情報を用いた細粒土砂汚染域の推定に関する基礎的研究

  文部科学省：科学研究費補助金(若手研究(B))

  Date (from‐to) : 2005 -2006 

  Author : 山田 浩之

   

  地理情報システム(GIS)を用いた空間情報解析と現地環境調査により,水圏生態系(生物相・生息環境)の劣化が生じる条件を統計的に明らかにし,細粒土砂汚染域を推定する方法を構築することを目的とした.最終年度である今年度は昨年度の追加調査とデータ解析,学会成果発表,論文投稿に重点に置いた.昨年度の成果の北海道の石狩泥炭地の小湖沼群を対象とした湖沼水質と関連付けた空間解析によって細粒土砂やアンモニア態窒素を主とした地表排水を由来とする成分の濃度が,湖沼に流入する水路数やその水路に連結する農地(水田・畑地)面積率の増加とともに高くなる傾向が得られている.また,浮遊した細粒土砂量を示すSS(浮遊物質)濃度が高い湖沼ほど農地開発後の移入種の個体数が増加することが明らかになっている.今年度の空間情報を用いたデータ解析の結果,湖沼に流入する水路数と湖沼の集水域の境界となる幹線排水路以内の農地面積率が細粒土砂汚染と関連する主要な空間的パラメータとなることが統計的に明らかになった.また,細粒土砂・栄養塩による水質汚染度合いが高い湖沼では,外来種を含む農地開発後の移入種が優占した魚類群集となり泥炭地の湖沼固有の魚類の分布に影響を及ぼしていることが示された.以上の成果から,細粒土砂汚染を防ぐために,湖沼に流入する農地排水路数と農地面積率の空間要素に注目した対策が必要であると結論付けた.一方,集水域が自...
• インドネシアの泥炭・森林における火災と炭素管理

  JST-JICA：地球規模課題対応国際科学技術協力事業

  Author : 大崎満