Ph. D, Tokyo University of Agriculture and Technology, Mar. 2007

Forest Ecology

Forest Soil

Environmental Isotope Science

Soil Nitrogen Transformation

Environmental Science/Agriculture Science, Landscape science

Environmental Science/Agriculture Science, Environmental agriculture

Life Science, Forest science

Environmental Science/Agriculture Science, Environmental dynamic analysis

Mar. 2016, The Ecological Sciety of Japan, Ecological Research Award, 2015
Biogeochemical nitrogen properties of forest soils in the Japanese archipelago
Rieko Urakawa;Nobuhito Ohte;Hideaki Shibata;Ryunosuke Tateno;Takuo Hishi;Keitaro Fukushima;Yoshiyuki Inagaki;Keizo Hirai;Tomoki Oda;Nobuhiro Oyanagi;Makoto Nakata;Hiroto Toda;Tanaka Kenta;Karibu Fukuzawa;Tsunehiro Watanabe;Naoko Tokuchi, Ta

Apr. 2014, 日本地球惑星科学連合2014年大会『生物地球化学』セッション最優秀ポスター賞
日本の森林土壌の窒素無機化速度―現地培養による年間窒素無機化量―
浦川梨恵子;大手信人;柴田英昭;小田智基;渡辺恒大;福澤加里部;稲垣善之;舘野隆之輔;小柳信宏;服部大地;中田誠;菱拓雄;福島慶太郎;中西麻美;戸田浩人

Apr. 2004, 森林立地学会誌, 第6回論文賞
スギ・ヒノキ壮齢林人工林小流域における降雨の移動に伴う溶存有機態窒素および溶存有機態炭素の動態
小柳信宏;浦川梨恵子;生原喜久雄;戸田浩人, Japan

Soil pH modulates microbial nitrogen allocation in soil via compositional and metabolic shifts across forests in Japan
Yaping Liu; Yuta Ise; Hideto Takami; Rieko Urakawa; Ryunosuke Tateno; Atsushi Toyoda; Nobuhito Ohte; Weiyu Shi; Lin Jiang; Kazuo Isobe
iMetaOmics, Wiley, 18 Sep. 2025, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
Scientific journal, Abstract

Ammonium release (ammonification) and uptake (immobilization) by soil microbial communities are fundamental processes of forest nitrogen (N) cycling, representing major N fluxes that influence plant productivity and ecosystem N retention. However, because these processes involve diverse metabolic pathways distributed across many taxa, they are difficult to evaluate using gene‐ or taxon‐specific approaches, and it remains unclear how microbial community structure governs the patterns of these processes. In this study, we examined how the abundance, taxonomic composition, richness, and metabolic capabilities of microbial communities regulate ammonium‐related N cycling processes across a wide range of forests in Japan, using rRNA gene sequencing and quantification, shotgun metagenomics, and ^¹⁵N tracer assays. Across the full gradients of soil pH and N content, microbial abundance was primarily correlated with the absolute rates of N cycling processes, while taxonomic composition and richness were more strongly correlated with N allocation—that is, the balance among ammonium release, ammonium uptake, and subsequent nitrification. Soils with higher pH supported taxonomic compositions linked to enhanced ammonium release and nitrification, whereas lower‐pH soils hosted compositions associated with greater ammonium uptake and retention. Notably, the regulatory influence of taxonomic composition on N allocation was pronounced within the higher‐pH range but diminished within the lower‐pH range. Despite this environmental dependency, N allocation by soil microbial communities was ultimately constrained by their overall metabolic capabilities. In higher‐pH soils, microbial communities were enriched in metabolic functions related to nutrient acquisition and respiratory N transformations, supporting increased ammonium release and N mobility. By contrast, microbial communities in lower‐pH soils were enriched in stress‐adaptive functions, which promoted ammonium retention and limited N transformations—thereby diminishing the regulatory influence in N cycling. Together, our findings provide a mechanistic understanding of how microbial community structure and metabolic capabilities regulate ammonium‐related N cycling processes across forests under varying environmental conditions.

Long‐term changes in stream water chemistry in small forested watersheds in the northern Kanto region
Rieko Urakawa; Hiroto Toda; Yue Cao
Ecological Research, 40, 3, 264, 276, Wiley, May 2025, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
English, Scientific journal, Abstract

Concerns have been raised regarding the degradation of stream water quality due to the excessive influx of atmospheric deposition. This study aimed to reveal the long‐term variation in stream water chemistry in approximately 40 forested small watersheds in the northern Kanto region, based on 3 surveys conducted in 1991–1992, 2006–2007, and 2022. The factors influencing each dissolved element were investigated. Regarding long‐term variations in stream water chemistry, relatively stable concentrations of cations (Ca²⁺, Mg²⁺, K⁺, and Na⁺) and SiO₂ were observed. However, the concentrations of anions (Cl⁻, , and ) decreased due to the improvement in the atmospheric environment and the diminishing effect of fertilization. Furthermore, the recent increase in stream water pH was attributed to an increase in bicarbonate (), compensating for the decrease in anion concentrations relative to cations. Geology was the most significant factor for inter‐watershed variations in cations and SiO₂, and this influence remained relatively constant over 30 years. Forest practices, especially fertilization, had a significant effect on Cl⁻ and , and contributed to higher concentrations in the fertilized watersheds than in the non‐fertilized watersheds over the 15 years following fertilization. Sulfate deposition was a significant influencing factor for , and the concentration fluctuated under long‐term variations in deposition over the past 30 years. Despite substantial acid deposition in the study area, the absence of stream water acidification could be attributed to the abundant cation supply from bedrock and volcanic ash, which underwent weathering processes., 13416941

A global dataset of gross nitrogen transformation rates across terrestrial ecosystems
Eunji Byun; Christoph Müller; Barbara Parisse; Rosario Napoli; Jin-Bo Zhang; Fereidoun Rezanezhad; Philippe Van Cappellen; Gerald Moser; Anne B. Jansen-Willems; Wendy H. Yang; Rieko Urakawa; José Ignacio Arroyo; Ulderico Neri; Ahmed S. Elrys; Pierfrancesco Nardi
Scientific Data, 11, 1, Springer Science and Business Media LLC, 19 Sep. 2024, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
Scientific journal

Effects of geological conditions and atmospheric deposition on soil biogeochemical properties in Japanese forested ecosystems revealed by Sr isotope analysis
Rieko Urakawa; Tamihisa Ohta; Ki-Cheol Shin; Hiroyuki Sase; Hideaki Shibata; Takaya Chikamasa; Takanori Nakano
Biogeochemistry, Springer Science and Business Media LLC, 09 Nov. 2022, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
Scientific journal, 13416941

Nutrient budgets in four Japanese forests based on short-and long-term methods.
Yoshiyuki Inagaki; Kazumichi Fujii; Rieko Urakawa
Bulletin of the Forestry and Forest Products Research Institute, 21, 2, 129, 137, Forestry and Forest Products Research Institute, Jun. 2022, [Peer-reviewed], [Domestic magazines]
English, Research institution, Estimation of the nutrient accumulation rate in tree biomass is important for understanding the nutrient budgets of forest ecosystems but choosing a suitable method can be challenging. In this study, we compared the nutrient budgets of four forest ecosystems in Japan (Oyasan, Kamigamo, Kiryu, and Takatori) and estimated the nutrient accumulation rates in tree biomass using two methods. For short-term estimates, the nutrient content of tree biomass was measured at two points in time over several years; for long-term estimates, the nutrient content was divided by forest age. The nutrient accumulation rates estimated using the long-term method was lower than those using the short-term method. Weathering rates for potassium, magnesium, and calcium estimated using the long-term method were lower than those using the short-term method. Weathering rates determined using the short-term method were high and could be overestimates in nutrient-limited forests. Soil nitrogen release values were lower with the longterm method than those with the short-term method and could be overestimated when using the latter method in nitrogen-limited watersheds. In conclusion, weathering rates and soil nitrogen release values determined using the long-term method are useful for assessing the sustainability of nutrient cycling in forest ecosystems although the rate of nutrient accumulation in tree biomass is assumed to be constant.

Topography is more important than forest type as a determinant for functional trait composition of Collembola community
Takuo Hishi; Rieko Urakawa; Seikoh Saitoh; Yuka Maeda; Fujio Hyodo
Pedobiologia, 90, 150776, 150776, Elsevier BV, Mar. 2022, [Peer-reviewed], [International Magazine]
Scientific journal

Spatial distribution of mercury accumulation in the surface soil of Japanese forests
Takaya Chikamasa; Hideaki Shibata; Rieko Urakawa; Karibu Fukuzawa; Muneto Hirobe; Yoshiyuki Inagaki
Journal of Forest Research, 26, 2, 1, 7, Informa UK Limited, 31 Dec. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal

Effect of root litter addition on nitrogen mineralization rate under laboratory low‐temperature conditions in soil from a Japanese northern hardwood forest
Nanae Hosokawa; Kazuo Isobe; Rieko Urakawa; Ryunosuke Tateno; Karibu Fukuzawa; Tsunehiro Watanabe; Hideaki Shibata
Ecological Research, 35, 5, 888, 899, Sep. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal

The effect of a freeze–thaw cycle on dissolved nitrogen dynamics and its relation to dissolved organic matter and soil microbial biomass in the soil of a northern hardwood forest
Watanabe, T.; Tateno, R.; Imada, S.; Fukuzawa, K.; Isobe, K.; Urakawa, R.; Oda, T.; Hosokawa, N.; Sasai, T.; Inagaki, Y.; Hishi, T.; Toda, H.; Shibata, H.
Biogeochemistry, 142, 3, 319, 338, 2019, [Peer-reviewed], [International Magazine]
English, Scientific journal

Points of attention of ion exchange resin used in resin-core method to determine soil nitrogen mineralization and nitrification
Rieko Urakawa; Hideaki Shibata; Hiroto Toda
Japanese Journal of Forest Environment, 60, 87, 90, Dec. 2018, [Peer-reviewed], [Lead author, Corresponding author], [Domestic magazines]
Japanese, Scientific journal

High soil microbial activity in the winter season enhances nitrogen cycling in a cool-temperate deciduous forest
Kazuo Isobe; Hiroaki Oka; Tsunehiro Watanabe; Ryunosuke Tateno; Rieko Urakawa; Chao Liang; Keishi Senoo; Hideaki Shibata
Soil Biology and Biochemistry, 124, 90, 100, Elsevier BV, Sep. 2018, [Peer-reviewed], [International Magazine]
Scientific journal

Effects of species replacement on the relationship between net primary production and soil nitrogen availability along a topographical gradient: Comparison of belowground allocation and nitrogen use efficiency between natural forests and plantations
Yuka Maeda; Naoaki Tashiro; Tsutomu Enoki; Rieko Urakawa; Takuo Hishi
Forest Ecology and Management, 422, 214, 222, Elsevier B.V., 15 Aug. 2018, [Peer-reviewed], [International Magazine]
English, Scientific journal

Stream runoff and nitrate recovery times after forest disturbance in the USA and Japan
Tomoki Oda; Mark B Green; Rieko Urakawa; Todd M Scanlon; Stephen D Sebestyen; Kevin J McGuire; Masanori Katsuyama; Karibu Fukuzawa; Mary B Adams; Nobuhito Ohte
Water Resources Research, 54, 9, 6042, 6054, Aug. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal

鷹取山試験地のスギ人工林とモミ天然林の土壌特性
稲垣善之; 酒井寿夫; 浦川梨恵子; 柴田英昭
森林総合研究所四国支所年報, 58, 18, 25, Oct. 2017, [Peer-reviewed], [Domestic magazines]
Japanese, Research institution

Effects of soil origin and current microclimate conditions on nitrogen mineralization in forest soil on different slope aspects in Hokkaido, Japan
Takuo Hishi; Rieko Urakawa; Hideaki Shibata
ECOLOGICAL RESEARCH, 32, 5, 725, 733, Sep. 2017, [Peer-reviewed], [International Magazine]
English, Scientific journal

Soil freeze–thaw with root litter alters N transformations during the dormant season in soils under two temperate forests in northern Japan
Hosokawa, N.; Isobe, K.; Urakawa, R.; Tateno, R.; Fukuzawa, K.; Watanabe, T.; Shibata, H.
Soil Biology and Biochemistry, 114, 270, 278, 2017, [Peer-reviewed], [International Magazine]
English, Scientific journal

Estimation of field soil nitrogen mineralization and nitrification rates using soil N transformation parameters obtained through laboratory incubation
Urakawa, R.; Ohte, N.; Shibata, H.; Tateno, R.; Inagaki, Y.; Oda, T.; Toda, H.; Fukuzawa, K.; Watanabe, T.; Hishi, T.; Oyanagi, N.; Nakata, M.; Fukushima, K.; Nakanishi, A.
Ecological Research, 32, 2, 279, 285, 2017, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
English, Scientific journal

Factors contributing to soil nitrogen mineralization and nitrification rates of forest soils in the Japanese archipelago
Rieko Urakawa; Nobuhito Ohte; Hideaki Shibata; Kazuo Isobe; Ryunosuke Tateno; Tomoki Oda; Takuo Hishi; Keitaro Fukushima; Yoshiyuki Inagaki; Keizo Hirai; Nobuhiro Oyanagi; Makoto Nakata; Hiroto Toda; Tanaka Kenta; Megumi Kuroiwa; Tsunehiro Watanabe; Karibu Fukuzawa; Naoko Tokuchi; Shin Ugawa; Tsutomu Enoki; Asami Nakanishi; Nobuko Saigusa; Yukio Yamao; Ayumi Kotani
FOREST ECOLOGY AND MANAGEMENT, 361, 382, 396, Feb. 2016, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
English, Scientific journal

Spatial patterns of fine root biomass and performances of understory dwarf bamboo and trees along with the gradient of soil N availability in broad-leaved natural forests and larch plantation
Takuo Hishi; Naoaki Tashiro; Yuka Maeda; Rieko Urakawa; Hideaki Shibata
Plant Root, 9, 1, 85, 94, Japanese Society for Root Research, 31 Dec. 2015, [Peer-reviewed], [Domestic magazines]
English, Scientific journal

Soil nitrogen transformation dynamics in a suburban forest near Tokyo Metropolitan Area under high nitrogen deposition: A case study using stable isotope tracer techniques
Jun Shi; Nobuhito Ohte; Naoko Tokuchi; Kazuo Isobe; Rieko Urakawa; Naohiro Imamura; Tomoki Oda; Masakazu Suzuki
東京大学農学部演習林報告, 132, 17, 34, Mar. 2015, [Peer-reviewed], [Domestic magazines]
English, Research institution

Meteorological observations in University Forest of TUAT from 2003 to 2013
Rieko URAKAWA; Hiroyuki KINOSHITA; Minoru KANEKO; Mitsuru KUMAKURA; Makoto KUWABARA; Takayuki IWAMOTO; Naoaki WATANABE; Tomohiro YOSHIDA; Hiroto TODA
Journal of Field Science, 13, 17, 29, Mar. 2015, [Peer-reviewed], [Lead author, Corresponding author], [Domestic magazines]
Japanese, Research institution

Microbial denitrification dominates nitrate losses from forest ecosystems
Yunting Fang; Keisuke Koba; Akiko Makabe; Chieko Takahashi; Weixing Zhu; Takahiro Hayashi; Azusa A. Hokari; Rieko Urakawa; Edith Bai; Benjamin Z. Houlton; Dan Xi; Shasha Zhang; Kayo Matsushita; Ying Tu; Dongwei Liu; Feifei Zhu; Zhenyu Wang; Guoyi Zhou; Dexiang Chen; Tomoko Makita; Hiroto Toda; Xueyan Liu; Quansheng Chen; Deqiang Zhang; Yide Li; Muneoki Yoh
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 112, 5, 1470, 1474, Feb. 2015, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal

Biogeochemical nitrogen properties of forest soils in the Japanese archipelago
Rieko Urakawa; Nobuhito Ohte; Hideaki Shibata; Ryunosuke Tateno; Takuo Hishi; Keitaro Fukushima; Yoshiyuki Inagaki; Keizo Hirai; Tomoki Oda; Nobuhiro Oyanagi; Makoto Nakata; Hiroto Toda; Tanaka Kenta; Karibu Fukuzawa; Tsunehiro Watanabe; Naoko Tokuchi; Tatsuro Nakaji; Nobuko Saigusa; Yukio Yamao; Asami Nakanishi; Tsutomu Enoki; Shin Ugawa; Atsushi Hayakawa; Ayumi Kotani; Megumi Kuroiwa; Kazuo Isobe
Ecological Research, 30, 1, 1, 2, 21 Nov. 2014, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
Scientific journal

Effects of freeze–thaw cycles resulting from winter climate change on soil nitrogen cycling in ten temperate forest ecosystems throughout the Japanese archipelago
Rieko Urakawa; Hideaki Shibata; Megumi Kuroiwa; Yoshiyuki Inagaki; Ryunosuke Tateno; Takuo Hishi; Karibu Fukuzawa; Keizo Hirai; Hiroto Toda; Nobuhiro Oyanagi; Makoto Nakata; Asami Nakanishi; Keitaro Fukushima; Tsutomu Enoki; Yuichi Suwa
Soil Biology and Biochemistry, 74, 82, 94, Jul. 2014, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
Scientific journal

Seasonality of factors controlling N mineralization rates among slope positions and aspects in cool-temperate deciduous natural forests and larch plantations
Takuo Hishi; Rieko Urakawa; Naoaki Tashiro; Yuka Maeda; Hideaki Shibata
BIOLOGY AND FERTILITY OF SOILS, 50, 2, 343, 356, Feb. 2014, [Peer-reviewed], [International Magazine]
English, Scientific journal

Modifying the LEACHM model for process-based prediction of nitrate leaching from cropped Andosols
Kei Asada; Sadao Eguchi; Rieko Urakawa; Sunao Itahashi; Tsuneo Matsumaru; Tomoko Nagasawa; Kazuhiro Aoki; Ken Nakamura; Hidetaka Katou
PLANT AND SOIL, 373, 1-2, 609, 625, Dec. 2013, [Peer-reviewed], [International Magazine]
English, Scientific journal

Long-term hydrochemical monitoring in an Oyasan Experimental Forest Watershed comprised of two small forested watersheds of Japanese cedar and Japanese cypress
Rieko Urakawa; Hiroto Toda; Kikuo Haibara; Yoshinori Aiba
ECOLOGICAL RESEARCH, 27, 2, 245, 245, Mar. 2012, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
English, Scientific journal

Gross nitrification rates in four Japanese forest soils: heterotrophic versus autotrophic and the regulation factors for the nitrification
Megumi Kuroiwa; Keisuke Koba; Kazuo Isobe; Ryunosuke Tateno; Asami Nakanishi; Yoshiyuki Inagaki; Hiroto Toda; Shigeto Otsuka; Keishi Senoo; Yuichi Suwa; Muneoki Yoh; Rieko Urakawa; Hideaki Shibata
JOURNAL OF FOREST RESEARCH, 16, 5, 363, 373, Oct. 2011, [Peer-reviewed], [International Magazine]
English, Scientific journal

Changes in nitrogen transformation in forest soil representing the climate gradient of the Japanese archipelago
Hideaki Shibata; Rieko Urakawa; Hiroto Toda; Yoshiyuki Inagaki; Ryunosuke Tateno; Keisuke Koba; Asami Nakanishi; Karibu Fukuzawa; Ayaka Yamasaki
JOURNAL OF FOREST RESEARCH, 16, 5, 374, 385, Oct. 2011, [Peer-reviewed], [International Magazine]
English, Scientific journal

Composting of forest leaf litter in Satoyama preservation activities : Changes in chemical and biological characteristics of forest leaf litter with difference in composting years and the effects on plant growth
Ichikawa Takahiro; Ichikawa Asuka; Urakawa Rieko
Japanese Journal of Forest Environment, 52, 1, 11, 18, The Japanese Society of Forest Environment, 2010, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, In recent years, forest leaf litter collections and composting have been carried out as maintenance activities in Satoyama, Japan. The purpose of this study is to clarify the changing of chemical and biological characteristics differences in composting year of forest leaf litter in Satoyama and the effects on plant growth. Significant differences in water content of weight, percentage by nitrogen, C/N ratio, the degree of huminification (Absorbance at 600nm=A_<600>), water-soluble carbon, microbial biomass carbon, the degree of microbial activity (Absorbance at 490nm=A_<490>) of forest litter collections were compared with composting of one year were observed. The composting one year was not different from the composting in the following year. This study also indicated that plant growth was because of chemical fertilizer and composting the one and following year. These results showed that composting the one and following year was an effective contribution toward plant growth. In addition, it is considered that the degree of huminifation (A_<600>) and microbial activity (A_<490>) represented compost maturity of forest leaf litter and non-inhibition of plant injures.

Fungal and bacterial biomass at different slope positions in forest soil
Hiroto Toda; Kimiko Tsutsui; Satoshi Kita; Rieko Urakawa; Kikuo Haibara
Journal of the Japanese Society of Revegetation Technology, 35, 1, 15, 20, 2009, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal

Effects of anion adsorption characteristics of a volcanic ash soil on long-term NO3- leaching from a partial clear-cut cedar and cypress watershed
Rieko Urakawa; Hiroto Toda; Kikuo Haibara; DongSu Choi
Journal of the Japanese Forestry Society, 91, 3, 184, 191, Japanese Forestry Society, 2009, [Peer-reviewed], [Lead author, Corresponding author], [Domestic magazines]
Japanese, Scientific journal, Long-term changes in the water quality of soil water and streamwater were monitored before and after cutting at the lower slope position in a small forested watershed composed of artificial stands of old aged Japanese cedar and cypress in the northern Kanto region in Japan. The NO_3^- concentration in soil water directly reflected the N dynamics, i.e., the reduced nutrient uptake and accelerated nitrogen mineralization in the surface soil layer immediately after the cutting, and the increased nutrient uptake induced by regenerated trees several years after the practice. In contrast, the NO_3^- concentration in streamwater maintained higher level than before cutting in the sixth year after the practice. The NO_3^- concentrations in high and low discharge, which is dominated by direct flow and base flow, respectively, were calculated from the relationships between discharge rates and the NO_3^- concentration in streamwater. The results suggested that the NO_3^- distribution in soil affects the NO_3^- concentration in streamwater. Changes in the NO_3^- concentration in the subsoil were calculated using the HYDRUS-1D model, and these changes were consistent with previously measured seasonal and long-term changes in the NO_3^- concentration in streamwater. This finding implies that NO_3^- adsorption characteristics of the volcanic ash subsoil affects NO_3^- leaching into streamwater. In order to clarify the effects of the aging of artificial forests, the method of cutting, and environmental changes on N dynamics in soil and streamwater, it is necessary to consider the NO_3^- adsorption characteristics of volcanic ash soil.

A Simple Method of Measuring Microbial Activities in Organic Matter Using a FDA (Fluorescein Diacetate) Hydrolysis
Ichikawa Takahiro; Ichikawa Asuka; Urakawa Rieko
Japanese Journal of Forest Environment, 50, 2, 175, 177, The Japanese Society of Forest Environment, 2008, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, 迅速,簡易であるFDA加水分解活性法を用いた微生物活性の測定について,土壌のみならず有機物でも測定可能であるかどうかを検討した。その結果,市川ら(2002)の方法により有機物量を変化させて490nmでの吸光度(A_<490>)を測定したところ,原点を通る直線で回帰された。したがって,市川ら(2002)の方法は土壌のみならず有機物も測定可能であることが明らかにされた。また,490nmでの吸光度(A_<490>)は微生物バイオマス炭素量も概ね反映していた。

Numerical calculation of secondary discharge peak from a small watershed by a physically based watershed scale infiltration simulation
Katsushige Shiraki; Yoshiki Shinomiya; Rieko Urakawa; Hiroto Toda; Kikuo Haibara
Journal of Forest Research, 12, 3, 201, 208, Jun. 2007, [Peer-reviewed], [International Magazine]
English, Scientific journal

Effects of forest cutting in a lower slope on soil water and stream water chemistry in a watershed of old aged Japanese cedar and cypress stands
Rieko Urakawa
Tokyo University of Agriculture and Technology, 1, 178, Mar. 2007, [Lead author, Corresponding author]
Japanese, Doctoral thesis

Retardation of nitrogen leaching by the NO3- adsorption in the subsoil in a watershed of old Japanese cedar and cypress stands
Rieko Urakawa; Hiroto Toda; Kikuo Haibara
Journal of the Japanese Forestry Society, 89, 3, 190, 199, Japanese Forestry Society, 2007, [Peer-reviewed], [Lead author, Corresponding author], [Domestic magazines]
Japanese, Volcanic ash soils contain appreciable quantities of anion adsorption capacity (AEC) due to the variable charge, and they adsorb anions by non-specific adsorption. To study the effect of this characteristic on the NO_3^- dynamics in forest soil, the NO_3^- adsorption-desorption process by the A-horizon and the B-horizon soils that are under the influence of volcanic ash were determined by the batch and the column methods. The batch experiment indicated that the adsorbed NO_3^- by the B-horizon soils increased with the additive KNO_3 concentration. This result revealed the characteristics of the anion adsorption due to the variable charge soils. The A-horizon soils adsorbed less amount of NO_3^- than B-horizon soils. The NO_3^- adsorption amounts were negatively correlated with the total C concentration in soils, suggesting the amount of positive charge in the soil was controlled by the organic matter. Meanwhile, the NO_3^- adsorption amounts were negatively correlated with pH in the A-horizon soils. Therefore, the A-horizon soils have variable charge due to the presence of humic substances, which was different from the B-horizon in composition of the positive charge. From the column experiment, the NO_3^- concentrations in soil water of the field before and after cutting, and the thickness of the B-horizon soil, the increment of NO_3^- adsorption amounts in the subsoil after cutting was calculated to be approximately 60 kgN ha^<-1>. This value indicated that the subsoil temporarily retained large amounts of N decomposed and released from forest floor, which inhibited the rapid increase in the NO_3^- concentration of stream water. When the soil columns filled with adsorbed NO_3^- were combined with deionized water, the entire additive NO_3^- was finally leached out from the columns. Therefore, it is expected that, while the increase in NO_3^- leaching from the cutting watershed would be reduced, the period of the increase would be long. From the column experiment and field observation, SO_4^<2-> leaching is also expected to increase followed by NO_3^- leaching, in the future.

Effects of forest cutting in a lower slope on soil water and stream water chemistry in a watershed of old Japanese cedar and cypress stands
Rieko Urakawa; Hiroto Toda; Kikuo Haibara
Journal of the Japanese Forestry Society, 87, 6, 471, 478, THE JAPANESE FORESTRY SOCIETY, 2005, [Peer-reviewed], [Lead author, Corresponding author], [Domestic magazines]
Japanese, Scientific journal, The effects of forest cutting on nutrient dynamics, soil water content and chemistry, and stream water discharge rates and chemistry were examined for three years after the partial (lower slope ; 20% of total area) forest cutting of a watershed composed of artificial stands of old (99 years) Japanese cedar and cypress in Gunma prefecture, Japan. After the forest cutting, the soil water content in the surface soil layer (010 cm) decreased, although it increased in a deeper layer (3060 cm). The annual stream water discharge increased by about 100 mm after forest cutting. Compared to the period before cutting, the concentrations of NO₃^-, Ca²⁺, Mg²⁺, and K⁺ in surface soil water (5 cm) also increased during the summers of the first two years by about 37 times. However, three years after forest cutting, the concentrations decreased to the same levels as those in the period before cutting. Similarly, the stream water concentrations of NO₃^-, Ca²⁺, and Mg²⁺ increased 1.5 times. Seasonal changes in the concentrations of all analyzed ions in stream water increased in comparison with those before cutting. After forest cutting, the amount of NO₃^--N in the 3060 cm layer increased by four times the amount before cutting. Furthermore, this large amount persisted during the three consecutive years after the forest cutting. The NO₃^--N export to stream water increased up to 4.05.0 kg ha^-1 yr^-1 after cutting. However, the increase in the amount of NO₃^--N leaching to stream was smaller than that in soil water; this indicates the great potential of soil as a medium for NO₃^--N export. A higher amount of NO₃^--N in deeper soil (>30 cm) suggests retention and/or consumption of this ion in the soil even after the forest cutting.

The dynamics of dissolved organic nitrogen and dissolved organic carbon in a small watershed of established Japanese cedar and cypress plantation
Nobuhiro Oyanagi; Rieko Urakawa; Kikuo Haibara; Hiroto Toda
Japanese Journal of Forest Environment, 44, 1, 11, 20, The Japanese Society of Forest Environment, 2002, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, To clarify the dynamics of dissolved organic nitrogen (DON) and dissolved organic carbon (DOC) with vertical movements of rainfall in a small watershed of established Japanese cedar (Cryptomeria japonica D. Don) and Japanese cypress (Chamaecyparis obtusa Sieb. and Zucc.) plantation, DON, dissolved inorganic N (DIN), DOC in precipitation, throughfall, stemflow. A_0-percolation, soil water, spring water and stream water were investigated. DON and DOC in order of high concentrations were in A_0-percolation>throughfall>precipitation, and was rapidly in low concentration in soil water. The concentration of DOC decreased more along spring water and stream water. Annual fluxes of DON were 5.5kgha^<-1> in throughfall, 11.1kgha^<-1> in A_0-percolation, and only a little (under 0.9kgha^<-1>) in stream water. Annual fluxes of DOC were 139, 185, and 6.4kgha^<-1>, respectively. From throughfall to A_0-percolation, the percentage of DON to total dissolved nitrogen (TDN=DON+DIN) and the amount of NH_4-N decreased, and the amount of NO_3-N increased. The amount of DOC flux increase in throughfall minus A_0-percolation was smaller than that in precipitation minus throughfall. These results suggested that both the productivity of DON and DOC, and the activity of microbes for decomposition and nitrification in A_0-layer were high. The annual output of TDN from watershed was 13.8kgha^<-1>, and the percentage of DON/TDN was lower than 7%. The annual output of DOC was 6.4kgha^<-1>, which was smaller than those from the watersheds in Europe and North America. These results suggested that DON and DOC do not play an important role in N and C discharge from stream water in the established cedar and cypress plantation forests in Japan.

Clarifying acid neutralizing sites in forested watersheds in the northern Kanto Region, Japan-Distribution of the Sr isotopic ratio in stream water
浦川梨恵子; 戸田浩人; 越川昌美; 佐瀬裕之; SHIN Ki-cheol, 日本生態学会大会講演要旨(Web), 72nd, 2025

北関東地方の森林小流域における渓流水質の長期変化とその変動要因
浦川梨恵子; 戸田浩人; 曹越, 日本環境衛生センター所報論文集, 51, 1, 8, Sep. 2024, [Lead author, Corresponding author]

Influence of geology and atmospheric deposition on chemical properties in Japanese forest soils-revealed by Sr isotope analysis-
浦川梨恵子; 太田民久; SHIN Ki-cheol; 佐瀬裕之; 柴田英昭; 近政孝哉; 中野孝教, 日本生態学会大会講演要旨(Web), 69th, 2022

Distribution characteristics of lead isotope ratio in organic and mineral soil layers under Japanese forests
浦川梨恵子; 太田民久; SHIN Ki-Cheol; 佐瀬裕之; 柴田英昭, 日本地球惑星科学連合大会予稿集(Web), 2022, 2022

5 冬季気候変動下の土壌窒素無機化にササ（Sasa nipponica）細根リターが与える影響（東北支部講演会）
細川 奈々枝; 磯部 一夫; 浦川 梨恵子; 舘野 隆之輔; 福澤 加里部; 渡辺 恒大; 柴田 英昭, 日本土壌肥料学会講演要旨集, 65, 0, 239, 239, 2019, [Peer-reviewed]
一般社団法人 日本土壌肥料学会, Japanese

Effect of soil freeze-thaw on soil nitrogen transformations through increase in root-litter input
hosokawa nanae; Isobe Kazuo; Urakawa Rieko; Tateno Ryunosuke; Fukuzawa Karibu; Watanabe Tsunehiro; Shibata Hideaki, The Japanese Forest Society Congress, 129, 0, 718, 718, 2018

[in Japanese]

, THE JAPANESE FORESTRY SOCIETY, Japanese

Effect of soil freeze-thaw on soil nitrogen transformation through alteration of root litter
Hosokawa Nanae; Isobe Kazuo; Urakawa Rieko; Tateno Ryunosuke; Fukuzawa Karibu; Watanabe Tsunehiro; Shibata Hideaki, The Japanese Forest Society Congress, 127, 0, 396, 396, 2016
[in Japanese], THE JAPANESE FORESTRY SOCIETY, Japanese

Microbial Growth and Death and Nitrogen Dynamics in Forest Soil
Isobe Kazuo; Oka Hiroaki; ワタナベ ツネヒロ; Urakawa Rieko; Tateno Ryunosuke; Senoo Keishi; Shibata Hideaki, The Japanese Forest Society Congress, 127, 0, 707, 707, 2016
[in Japanese], THE JAPANESE FORESTRY SOCIETY, Japanese

The changes of soil microbial biomass and nitrogen dynamics from winter to spring by snow manipulation experiment
Watanabe Tsunehiro; Makoto Kobayashi; Shibata Hideaki; Tateno Ryunosuke; Imada Shogo; Fukuzawa Karibu; Isobe Kazuo; Urakawa Rieko; Oda Tomoki; Hosokawa Nanae, The Japanese Forest Society Congress, 127, 0, 706, 706, 2016
[in Japanese], THE JAPANESE FORESTRY SOCIETY, Japanese

Estimation of field net nitrogen mineralization and nitrification rate by parameters obtained from laboratory incubation
Urakawa Rieko; Oyanagi Nobuhiro; Nakata Makoto; Inagaki Yoshiyuki; Fukushima Keitaro; Nakanishi Asami; Ohte Nobuhito; Shibata Hideaki; Tateno Ryunosuke; Oda Tomoki; Toda Hiroto; Fukuzawa Karibu; Watanabe Tsunehiro; Hishi Takuo, The Japanese Forest Society Congress, 127, 0, 638, 638, 2016
[in Japanese], THE JAPANESE FORESTRY SOCIETY, Japanese

日本の森林土壌における窒素無機化・硝化速度の制限要因
浦川梨恵子; 大手信人; 柴田英昭; 磯部一夫; 舘野隆之輔; 小田智基; 菱拓雄; 福島慶太郎; 稲垣善之; 平井敬三; 小柳信宏; 中田誠; 戸田浩人; 田中健太; 渡辺恒大; 福澤加里部; 徳地直子; 鵜川信; 榎木勉; 中西麻美; 三枝信子; 山尾幸夫; 小谷亜由美, 日本森林学会大会学術講演集, 126th, 216, 26 Mar. 2015
Japanese

東京近郊の森林における高窒素沈着下の土壌窒素の形態変化について
Shi J.; 大手 信人; 徳地 直子; 磯部 一夫; 浦川 梨恵子; 今村 直広; 小田 智基; 鈴木 雅一, 東京大学農学部演習林報告, 132, 17, 34, Mar. 2015
大気沈着による窒素の負荷が過剰な森林における土壌中の窒素ダイナミクスの実態を明らかにするために，東京の都市近郊に位置する東京大学田無演習林内のスギ林分（Plot A）とクヌギ林分（Plot B）において，植物の成長期における有機物層，鉱質土層表層部の無機態窒素（NO3-，NH4+）現存量，総窒素無機化・硝化速度を測定した。両方の林分において，無機態の窒素濃度（10-120 mg N (kg dry soil)-1）は有機物層，鉱質土層表層部で，日本の森林における平均的な値より顕著に高かった。総硝化速度も（3-26 mg N (kg dry soil)-1 day-1），両林分において我が国でこれまでに報告されている事例に比べて高かったが，総NO3-不動化速度はPlot B（3-78 mg N (kg dry soil)-1 day-1）において，Plot A（3-17 mg N (kg dry soil)-1 day-1）よりも顕著に高かった。これらのことは，先行の調査結果でPlot BのA層における土壌水中のNO3-の濃度がその上層に比べて低下し，Plot Aではその傾向が見られない現象を説明するものであった。日本の中央部に位置する桐生水文試験地のような窒素沈着量が少ないサイトとの比較から，反応性の窒素沈着が多いことが，NH4+の生成-不動化が支配的なシステムから，それにNO3-の生成-不動化システムが付加されたシステムへの移行を生じさせる重要な要因であることが示唆された。, English

高齢スギ・ヒノキ人工林の伐採・更新施業にともなう窒素流出の長期変化
浦川梨恵子; 戸田浩人; 小田智基; 大手信人, 日本地球惑星科学連合大会予稿集(Web), 2015, 2015

Nitrogen mineralization rates in forest soils in the Japanese archipelago measured by field incubation
Urakawa Rieko; Ohte Nobuhito; Shibata Hideaki; Oda Tomoki; Watanabe Tsunehiro; Fukuzawa Karibu; Inagaki Yoshiyuki; Tateno Ryunosuke; Oyanagi Nobuhiro; Hattori Daichi; Nakata Makoto; Hishi Takuo; Fukushima Keitaro; Nakanishi Asami; Toda Hiroto, JpGU Meeting 2014, Apr. 2014
Japanese

Nitrogen mineralization rates in forest soils in Japanese archipelago - Soil chemical properties -
浦川 梨恵子; 大手 信人; 柴田 英昭; 渡辺 恒大; 福澤 加里部; 舘野 隆之輔; 菱 拓雄; 福島 慶太郎; 稲垣 善之; 平井 敬三; 戸田 浩人; 田中 健太; 小柳 信宏; 服部 大地; 中田 誠; 小田 智基; 三枝 伸子; 山尾 幸夫; 中西 麻美; 榎木 勉; 鵜川 信, JPGU2013, May 2013

Response of fine roots to the change in nitrogen mineralization of soil in cool-temperate forest in Hokkaido
Fukuzawa Karibu; Urakawa Rieko; Hishi Takuo; Shibata Hideaki; Miyamoto Toshizumi; Tateno Ryunosuke, The Japanese Forest Society Congress, 124, 0, 816, 816, 2013
土壌の窒素動態と植物細根による養分吸収の関係を明らかにするため、細根侵入の有無が土壌の正味窒素無機化量に及ぼす影響を調べた。北海道の多雪・少雪地域に位置する北大雨龍および九大足寄の天然林にてレジンコア法による現地培養を行い、土壌カラムの部分をメッシュにしたイングロスコア式レジンコア（根あり区）と通常のレジンコア（根なし区）との間で窒素無機化量を比較した。2010年11月に雨龍・足寄の両サイトで現地の土壌を用いてミズナラの周囲にレジンコアを埋設し、一部は2011年4月に回収し、残りは8月まで引き続き足寄で野外培養した。培養前後の土壌中の窒素量の差と回収後のイオン交換樹脂中の窒素量の合計値を正味の窒素無機化量（NH4-N生成量、NO3-N生成量）とした。足寄・雨龍土壌での生育期の根なし区における硝化率はそれぞれ43％、1％であった。一方、根あり区においては両土壌の正味窒素無機化量は同程度であったが、足寄土壌でNO3-N生成が、雨龍土壌でNH4-N生成がそれぞれ低下した。生成する窒素の形態の変化に対して、細根は利用しやすい形態の窒素を吸収するという可塑性をもっていることが示された。, THE JAPANESE FORESTRY SOCIETY, Japanese

Effects of freeze-thaw cycles by winter climate change on soil nitrogen dynamics in ten temperate forest ecosystems throughout Japanese archipelago
Urakawa Rieko; Oganagi Nobuhiro; Nakata Makoto; Nakanishi Asami; Fukushima Keitaro; Enoki Tsutomu; Koba Keisuke; Suwa Yuichi; Shibata Hideaki; Kuroiwa Megumi; Inagaki Yoshiyuki; Tateno Ryunosuke; Hishi Takuo; Fukuzawa Karibu; Hirai Keizo; Toda Hiroto, The Japanese Forest Society Congress, 124, 0, 171, 171, 2013
温帯の森林生態系では、冬季気候変動によりもたらされる凍結融解サイクルの変化が土壌の窒素(N)動態に影響を与えることが予想される。本研究では日本各地10カ所の土壌を、北海道の多雪(非凍結環境)および少雪地帯(凍結融解環境)で野外培養することにより、凍結融解サイクルの有無によるN無機化、硝化速度の変化と、凍結融解サイクルに対する反応の大きさと土壌特性との関係を調査した。また、凍結融解サイクル経験の有無が生育期のN動態に与える影響を明らかにするため、春～夏季のN無機化、硝化速度も引き続き調査した。凍結融解環境下にあった土壌は、非凍結環境下の土壌に比べて冬季の無機化速度は大きく、硝化速度は小さかった。生育期では、凍結融解サイクルを経験した土壌は、非凍結の土壌に比べて硝化速度が上昇する傾向がみられた。以上の反応には土壌による差が見られ、総硝化速度、総硝酸消費速度およびアンモニウム態N現存量の高い土壌ほど、無機化速度および硝化速度の凍結融解環境と非凍結環境の差が大きかった。微生物活性や肥沃度の高い土壌では、気候変動にともなう凍結融解サイクル変化に対して敏感に反応することが示唆された。
, THE JAPANESE FORESTRY SOCIETY, Japanese

1-39 稲わら堆肥連用黒ボク土畑における水・炭素・窒素動態の長期モニタリングとモデリング(1.物質循環・動態)
江口 定夫; 長谷川 周一; 朝田 景; 浦川 梨恵子; 青木 和博; 板橋 直; 中村 乾; 加藤 英孝, 日本土壌肥料学会講演要旨集, 57, 57, 13, 13, 08 Aug. 2011
一般社団法人日本土壌肥料学会, Japanese

気候変動による積雪変化が森林土壌の物質循環機能に及ぼす影響―全国サイトにおける土壌の化学的性質―
浦川梨恵子; 柴田英昭; 菱拓雄; 稲垣善之; 舘野隆之輔; 福澤加里部; 戸田浩人; 平井敬三; 中西麻美; 福島慶太郎; 中田誠; 小柳信宏; 榎木勉, 日本森林学会大会学術講演集(CD-ROM), 122nd, 0, ROMBUNNO.B07, 46, 25 Mar. 2011
THE JAPANESE FORESTRY SOCIETY, Japanese

21 農業由来窒素の負荷軽減シナリオによる地下水汚染リスクの評価(関東支部講演会,2010年度各支部会講演要旨)
朝田 景; 江口 定夫; 浦川 梨恵子; 青木 和博; 板橋 直; 中村 乾; 加藤 英孝, 日本土壌肥料学会講演要旨集, 57, 311, 311, 2011
一般社団法人 日本土壌肥料学会, Japanese

Effects of fine roots on soil nitrogen mineralization in cool-temperate forests in Hokkaido
Fukuzawa Karibu; Urakawa Rieko; Hishi Takuo; Shibata Hideaki; Miyamoto Toshizumi; Inoue Takahiro; Tateno Ryunosuke, The Japanese Forest Society Congress, 123, 0, L06, L06, 2011
THE JAPANESE FORESTRY SOCIETY, Japanese

4地点の森林土壌における総硝化速度と微生物
黒岩恵; 木庭啓介; 戸田浩人; 楊宗興; 磯部一夫; 妹尾啓史; 柴田英昭; 福澤加里部; 稲垣善之; 舘野隆之輔; 中西麻美; 浦川梨恵子, 日本森林学会大会学術講演集(CD-ROM), 121st, ROMBUNNO.H04, 02 Apr. 2010
Japanese

Report on the field excursion of the Japanese Society of Forest Environment in 2009 : How to develop long, straight, and narrow woods
Urakawa Rieko, Japanese Journal of Forest Environment, 51, 1, 77, 80, 2009
The Japanese Society of Forest Environment, Japanese, Meeting report

Characteristics of nutrient movements in forest soil - Studies in Field Museum (FM) of Tokyo University of Agriculture and Technology -
Kikuo Haibara; Hiroto Toda; Rieko Urakawa, Japanese Journal of Forest Environment, 50, 2, 97, 109, 2008, [Peer-reviewed]
The Japanese Society of Forest Environment, Japanese, Introduction scientific journal

10.高齢人工林小流域における斜面下部伐採が流出水量および水質に及ぼす影響
浦川梨恵子; 山元大輔; 戸田浩人; 生原喜久雄, スギ・ヒノキ人工林における伐期・伐採方法が渓流水質に及ぼす影響.平成14～16年度科研研究報告(課題番号14360083), 113, 124, 2005
Japanese, Others

6.斜面下部の伐採および斜面位置が表層土壌の窒素無機化に及ぼす影響
浦川梨恵子; 高橋 彩; 戸田浩人; 生原喜久雄, スギ・ヒノキ人工林における伐期・伐採方法が渓流水質に及ぼす影響.平成14～16年度科研研究報告(課題番号14360083), 45, 58, 2005
Japanese, Others

5.伐採がスギ・ヒノキ高齢林小流域の渓流水質に及ぼす影響
小柳信宏; 浦川梨恵子; 戸田浩人; 生原喜久雄, スギ・ヒノキ人工林における伐期・伐採方法が渓流水質に及ぼす影響.平成14～16年度科研研究報告(課題番号14360083), 39, 44, 2005
Japanese, Others

森林と物質循環
浦川 梨恵子, 第4章 土壌窒素動態の空間変動
共立出版, Mar. 2018, [Joint work]

森のバランス
浦川 梨恵子, 第23章 ミネラルの循環
東海大学出版会, Apr. 2012, Japanese, Scholarly book, [Joint work]

森林小流域における酸緩衝の場の解明―岩石の弱酸可溶性Sr同位体比―
浦川梨恵子; 戸田浩人; 越川昌美; 諸橋将雪; 佐瀨裕之; 申 基澈
第137回日本森林学会大会, 18 Mar. 2026, Poster presentation

北関東地域の森林小流域における岩石に含まれる可溶性Sr同位体比
浦川梨恵子; 戸田浩人; 越川昌美; 諸橋将雪; 佐瀨裕之; 申 基澈
第15回同位体環境学シンポジウム, 19 Dec. 2025, Poster presentation

北関東地域の森林小流域における酸緩衝の場の解明―渓流水のSr同位体比の分布―
浦川梨恵子; 戸田浩人; 越川昌美; 佐瀨裕之; 申 基澈
第72回日本生態学会大会, 16 Mar. 2025, Poster presentation
15 Mar. 2025 - 18 Mar. 2025

北関東地域の森林小流域における渓流水Sr同位体比の地理的分布
浦川梨恵子; 戸田浩人; 越川昌美; 佐瀨裕之; 申 基澈
第14回同位体環境学シンポジウム, 20 Dec. 2024, Poster presentation
20 Dec. 2024 - 20 Dec. 2024

森林土壌に含まれる重金属同位体比の長期変動
浦川梨恵子; 太田民久; 申 基澈; 佐瀨裕之
第13回同位体環境学シンポジウム, Dec. 2023, Japanese, Poster presentation
13416941

Geographical distribution of radiogenic Sr isotope ratio in soil and its contributing factors in Japanese forest ecosystems
Rieko Urakawa; Tamihisa Ohta; Ki-Cheol Shin; Hiroyuki Sase; Hideaki Shibata; Takaya Chikamasa; Takanori Nakano
Acid Rain 2020‒10th International Conference on Acid Deposition, Apr. 2023, English, Poster presentation
13416941

北関東地域の森林小流域における渓流水質の長期変動
浦川梨恵子; 戸田浩人; 曹 越
第134回日本森林学会大会, Mar. 2023, Japanese, Poster presentation

Nitrogen cycling in Japanese forest ecosystems with different types of mycorrhizal association
稲垣善之; 藤井一至; 浦川梨恵子; 柴田英昭
日本生態学会大会講演要旨(Web), 2023
2023 - 2023

北関東地域の森林小流域における渓流水質の形成要因と長期変化
浦川梨恵子; 戸田浩人; 曹 越
第12回同位体環境学シンポジウム, Dec. 2022, Japanese, Poster presentation

日本の森林土壌およびリター層に含まれる鉛同位体比の分布特性
浦川梨恵子; 太田民久; 申 基澈; 佐瀨裕之; 柴田英昭
日本地球惑星連合2022年大会, May 2022, Japanese, Poster presentation
13416941

森林土壌の化学性に及ぼす地質と大気降下物の影響―Sr同位体比による解析―
浦川梨恵子; 太田民久; 申 基澈; 佐瀨裕之; 柴田英昭; 近政孝哉; 中野孝教
第69回日本生態学会大会, Mar. 2022, Japanese, Poster presentation
13416941

Effects of mycorrhizal type on nutrient cycling in Japanese forest ecosystems
稲垣善之; 藤井一至; 浦川梨恵子; 柴田英昭
日本生態学会大会講演要旨(Web), 2022
2022 - 2022

日本の4つの森林における長期的と短期的な手法に基づく樹木の養分蓄積速度
稲垣善之; 藤井一至; 浦川梨恵子
日本森林学会大会学術講演集, 2022
2022 - 2022

日本の森林土壌に含まれる鉛同位体比の地理的分布特性
浦川梨恵子; 太田民久; 申 基澈; 佐瀨裕之; 柴田英昭
第11回同位体環境学シンポジウム, Dec. 2021, Japanese, Poster presentation
13416941

Geographical distribution of bioavailable lead in Japanese forest soil
Urakawa Rieko; Ohta Tamihisa; Shin Ki-cheol; Sase Hiroyuki; Shibata Hideaki
The Japanese Forest Society Congress, 24 May 2021, The Japanese Forest Society, Japanese
24 May 2021 - 24 May 2021, [in Japanese]

日本の森林土壌に含まれる可給態鉛の地理的分布
浦川梨恵子; 太田民久; 申 基澈; 佐瀨裕之; 柴田英昭
第132回日本森林学会大会, Mar. 2021, Japanese, Poster presentation
13416941

日本の森林土壌の化学性に対する地質と大気降下物の影響―Sr同位体比による解析―
浦川梨恵子; 太田民久; 申 基澈; 佐瀨裕之; 柴田英昭; 中野孝教
第10回同位体環境学シンポジウム, Dec. 2020, Japanese, Poster presentation
13416941

Estimation of heavy metal fractionation in forest soils by sequential extraction focusing on Pb and Sr
Urakawa Rieko; Ohta tamihisa; Shin Ki-cheol; Sase Hiroyuki; Shibata Hideaki
The Japanese Forest Society Congress, 25 May 2020, The Japanese Forest Society, Japanese
25 May 2020 - 25 May 2020, [in Japanese]

Estimation of heavy metal fractionation in forest soils by sequential extraction focusing on Pb and Sr
Rieko Urakawa; Tamihisa Ohta; Ki-cheol Shin; Hiroyuki Sase; Hideaki Shibata
第131回日本森林学会大会, Mar. 2020, Poster presentation

Estimation of heavy metal fractionation in forest soils using sequential extraction focusing on Pb and Sr
Rieko Urakawa; Tamihisa Ohta; Ki-cheol Shin; Hiroyuki Sase; Hideaki Shibata
第9回同位体環境学シンポジウム, Dec. 2019, Poster presentation

日本各地の森林土壌とリター層に蓄積するPb・Sr同位体比
浦川梨恵子; 太田民久; 申 基澈; 佐瀨裕之; 柴田英昭; 中野孝教
第130回日本森林学会大会, Mar. 2019, Japanese, Poster presentation
[Domestic Conference]

粒径分画を用いた森林表層土壌に含まれる有機態窒素の分解性評価
廣部宗; 冨田悟司; 浦川梨恵子; 兵藤不二夫; 柴田英昭
日本生態学会大会講演要旨(Web), 09 Feb. 2019, Japanese
09 Feb. 2019 - 09 Feb. 2019

冬季気候変動下の土壌窒素無機化にササ(Sasa nipponica)細根リターが与える影響
細川奈々枝; 細川奈々枝; 磯部一夫; 浦川梨恵子; 浦川梨恵子; 舘野隆之輔; 福澤加里部; 渡辺恒大; 渡辺恒大; 柴田英昭
日本土壌肥料学会講演要旨集(Web), 2019
2019 - 2019

5 冬季気候変動下の土壌窒素無機化にササ（Sasa nipponica）細根リターが与える影響（東北支部講演会）
細川 奈々枝; 磯部 一夫; 浦川 梨恵子; 舘野 隆之輔; 福澤 加里部; 渡辺 恒大; 柴田 英昭
日本土壌肥料学会講演要旨集, 2019, 一般社団法人 日本土壌肥料学会, Japanese
2019 - 2019

森林土壌の交換性鉛・ストロンチウム同位体比
浦川梨恵子; 太田民久; 申 基澈; 佐瀨裕之; 柴田英昭; 中野孝教
第8回同位体環境学シンポジウム, Dec. 2018, Japanese, Poster presentation
[Domestic Conference]

土壌の凍結融解が根リター増加を介して土壌の窒素変換に与える影響
細川奈々枝; 磯部一夫; 浦川梨恵子; 浦川梨恵子; 舘野隆之輔; 福澤加里部; 渡辺恒大; 渡辺恒大; 柴田英昭
日本森林学会大会学術講演集, 26 Mar. 2018, Japanese
26 Mar. 2018 - 26 Mar. 2018

Effect of soil freeze-thaw on soil nitrogen transformations through increase in root-litter input
hosokawa nanae; Isobe Kazuo; Urakawa Rieko; Tateno Ryunosuke; Fukuzawa Karibu; Watanabe Tsunehiro; Shibata Hideaki
The Japanese Forest Society Congress, 2018, THE JAPANESE FORESTRY SOCIETY, Japanese
2018 - 2018,

[in Japanese]

北海道東部の冷温帯林において土壌の凍結融解が細根リターの増加を通して土壌の窒素無機化に与える影響
細川奈々枝; 磯部一夫; 浦川梨恵子; 浦川梨恵子; 舘野隆之輔; 福澤加里部; 渡辺恒大; 渡辺恒大; 柴田英昭
日本森林学会大会学術講演集, 26 Mar. 2017, Japanese
26 Mar. 2017 - 26 Mar. 2017

森林の窒素循環に大気沈着が与える影響の解明：重金属のMulti-isoscapeを利用して
浦川梨恵子; 近政孝哉; 中野孝教; 申 基澈; 太田民久; 柴田英昭; 佐瀨裕之
第64回日本生態学会大会, Mar. 2017, Japanese, Oral presentation
[Domestic Conference]

全国森林リター中の微量元素濃度と鉛・ストロンチウム同位体比
浦川梨恵子; 近政孝哉; 中野孝教; 申 基澈; 太田民久; 柴田英昭; 佐瀨裕之
第6回同位体環境学シンポジウム, Dec. 2016, Japanese, Poster presentation
[Domestic Conference]

室内培養で得られる無機化・硝化パラメータによる野外窒素無機化量の推定
浦川梨恵子; 大手信人; 柴田英昭; 舘野隆之輔; 小田智基; 戸田浩人; 福澤加里部; 渡辺恒大; 菱拓雄; 小柳信宏; 中田誠; 稲垣善之; 福島慶太郎; 中西麻美
第127回日本森林学会大会, Mar. 2016, Japanese, Poster presentation
[Domestic Conference]

森林生態系における物質循環研究を広域で行うことのメリット・デメリット
浦川梨恵子
第63回日本生態学会大会 フォーラムU08次世代長期研究: JaLTER10周年企画第1弾, Mar. 2016, Japanese, Oral presentation
[Domestic Conference]

Effect of soil freeze-thaw on soil nitrogen transformation through alteration of root litter
Hosokawa Nanae; Isobe Kazuo; Urakawa Rieko; Tateno Ryunosuke; Fukuzawa Karibu; Watanabe Tsunehiro; Shibata Hideaki
The Japanese Forest Society Congress, 2016, THE JAPANESE FORESTRY SOCIETY, Japanese
2016 - 2016, [in Japanese]

Microbial Growth and Death and Nitrogen Dynamics in Forest Soil
Isobe Kazuo; Oka Hiroaki; ワタナベ ツネヒロ; Urakawa Rieko; Tateno Ryunosuke; Senoo Keishi; Shibata Hideaki
The Japanese Forest Society Congress, 2016, THE JAPANESE FORESTRY SOCIETY, Japanese
2016 - 2016, [in Japanese]

The changes of soil microbial biomass and nitrogen dynamics from winter to spring by snow manipulation experiment
Watanabe Tsunehiro; Makoto Kobayashi; Shibata Hideaki; Tateno Ryunosuke; Imada Shogo; Fukuzawa Karibu; Isobe Kazuo; Urakawa Rieko; Oda Tomoki; Hosokawa Nanae
The Japanese Forest Society Congress, 2016, THE JAPANESE FORESTRY SOCIETY, Japanese
2016 - 2016, [in Japanese]

全国森林リター中の微量元素濃度とストロンチウム同位体比
浦川梨恵子; 近政孝哉; 柴田英昭; 太田民久; 申 基澈; 中野孝教
第5回同位体環境学シンポジウム, Dec. 2015, Japanese, Poster presentation
[Domestic Conference]

高齢スギ・ヒノキ人工林の伐採・更新施業にともなう窒素流出の長期変化
浦川梨恵子; 戸田浩人; 小田智基; 大手信人
日本地球惑星連合2015年大会, May 2015, Japanese, Poster presentation
[Domestic Conference]

日本の森林土壌における窒素無機化・硝化速度の制限要因
浦川梨恵子; 大手信人; 柴田英昭; 磯部一夫; 舘野隆之輔; 小田智基; 菱拓雄; 福島慶太郎; 稲垣善之; 平井敬三; 小柳信宏; 中田誠; 戸田浩人; 田中健太; 渡辺恒大; 福澤加里部; 徳地直子; 鵜川信; 榎木勉; 中西麻美; 三枝信子; 山尾幸夫; 小谷亜由美
第126回日本森林学会大会, Mar. 2015, Japanese, Oral presentation
[Domestic Conference]

スギ・ヒノキ林内での斜面に沿った土壌中の無機化・硝化および含水率の空間的変動
加藤宏有; 大手信人; 小田智基; 磯部一夫; 浦川梨恵子
日本森林学会大会学術講演集, 2015
2015 - 2015

北海道東部における土壌微生物バイオマスと窒素動態の時系列変化
渡辺恒大; 柴田英昭; 舘野隆之輔; 今田省吾; 福澤加里部; 小田智基; 浦川梨恵子; 磯部一夫; 細川奈々枝; 小林真; 稲垣善之
日本地球惑星科学連合大会予稿集(Web), 2015
2015 - 2015

森林の土壌微生物群集の1年
岡裕章; 磯部一夫; 渡辺恒大; 舘野隆之輔; 浦川梨恵子; 妹尾啓史; 大塚重人; 柴田英昭
日本微生物生態学会大会(Web), 2015, Japanese
2015 - 2015

Risk evaluation system for nitrate pollution of groundwater at a river basin scale
Sunao Itahashi; Kei Asada; Rieko Urakawa; Kazuhiro Aoki; Sadao Eguchi; Hidetaka Katou
AGRO’2014‒9th IWA International Symposium on Waste Management Problems in Agro-Industries, Nov. 2014, English, Poster presentation
[International presentation]

Different allocation patterns of fine root biomass between understory dwarf bamboo and trees along with topographic sequence in natural broad leaved forests and larch plantations
Takuo Hishi; Rieko Urakawa; Naoaki Tashiro; Yuka Maeda; Hideaki Shibata
6th International symposium on physiological processes in roots of woody plants, Sep. 2014, English, Poster presentation
[International presentation]

Impact of altered soil freeze–thaw cycle by winter climate changes on soil nitrogen biogeochemistry in Japanese forest ecosystems
Hideaki Shibata; Rieko Urakawa; Megumi Kuroiwa; Yoshiyuki Inagaki; Ryunosuke Tateno; Takuo Hishi; Karibu Fukuzawa; Keizo Hirai; Hiroto Toda; Nobuhiro Oyanagi; Makoto Nakata; Asami Nakanishi; Keitaro Fukushima; Tsutomu Enoki; Yuichi Suwa; Tsunehiro Watanabe
BIOGEOMON 2014‒8th International Symposium on Ecosystem Behavior, Jul. 2014, English, Poster presentation
[International presentation]

Drivers of soil N mineralization and nitrification of forest soils in the Japnanese archipelago
Rieko Urakawa; Nobuhito Ohte; Hideaki Shibata; Kazuo Isobe; Tomoki Oda; Tsunehiro Watanabe; Karibu Fukuzawa; Shin Ugawa; Takuo Hishi; Tsutomu Enoki; Ryunosuke Tateno; Keitaro Fukushima; Asami Nakanishi; Ayumi Kotani; Nobuko Saigusa; Yukio Yamao; Nobuhiro Oyanagi; Daichi Hattori; Makoto Nakata; Tanaka Kenta; Hiroto Toda; Yoshiyuki Inagaki; Keizo Hirai
BIOGEOMON 2014‒8th International Symposium on Ecosystem Behavior, Jul. 2014, English, Poster presentation
[International presentation]

Estimation of the gross nitrification in the forests using Δ17O of nitrate
Yunting Fang; Keisuke Koba; Akiko Makabe; Chieko Takahashi; Weixing Zhu; Takahiro Hayashi; Azusa Hokari; Rieko Urakawa; Edith Bai; Dan Xi; Shasha Zhang; Kayo Matsushita; Ying Tu; Dongwei Liu; Feifei Zhu; Zhenyu Wang; Guoyi Zhou; Dexiang Chen; Tomoko Makita; Hiroto Toda; Xueyan Liu; Quansheng Chen; Deqiang Zhang; Yide Li; Muneoki Yoh
The 7th International Symposium on Isotopomers 2014, Jul. 2014, English, Poster presentation
[International presentation]

土壌の窒素無機化特性の変化に対応した細根の窒素吸収形態
福澤加里部; 浦川梨恵子; 菱拓雄; 柴田英昭; 宮本敏澄; 舘野隆之輔
根の研究, 20 Jun. 2014, Japanese
20 Jun. 2014 - 20 Jun. 2014

日本の森林土壌の窒素無機化速度―現地培養による年間窒素無機化量―
浦川梨恵子; 大手信人; 柴田英昭; 小田智基; 渡辺恒大; 福澤加里部; 稲垣善之; 舘野隆之輔; 小柳信宏; 服部大地; 中田誠; 菱拓雄; 福島慶太郎; 中西麻美; 戸田浩人
日本地球惑星連合2014年大会, Apr. 2014, Japanese, Poster presentation
[Domestic Conference]

土壌の窒素無機化の変化に対する細根の養分吸収の応答
福澤加里部; 浦川梨恵子; 菱拓雄; 柴田英昭; 宮本敏澄; 舘野隆之輔
根の研究, 20 Dec. 2013, Japanese
20 Dec. 2013 - 20 Dec. 2013

Characteristics of nitrogen mineralization rates and controlling factors in forest soils in Japanese archipelago
Rieko Urakawa; Nobuhito Ohte; Hideaki Shibata; Kazuo Isobe; Tomoki Oda; Tsunehiro Watanabe; Karibu Fukuzawa; Shin Ugawa; Takuo Hishi; Tsutomu Enoki; Ryunosuke Tateno; Keitaro Fukushima; Asami Nakanishi; Nobuko Saigusa; Yukio Yamao; Nobuhiro Oyanagi; Daichi Hattori; Makoto Nakata; Tanaka Kenta; Hiroto Toda; Yoshiyuki Inagaki; Keizo Hirai
2013 AGU Fall Meeting, 09 Dec. 2013, English, Poster presentation
San Francisco, California, USA, [International presentation]

Comparison of methods for determining the hydrologic recovery time after forest disturbance
Oda, Tomoki; Green, Mark B; Ohte, Nobuhito; Urakawa, Rieko; Endo, Izuki; Scanlon, Todd M; Sebestyen; Stephen D; McGuire, Kevin J; Katsuyama, Masanori; Fukazawa, Karibu; Tague, Christina; Hiraoka, Marino; Fukushima, Keitaro; Giambelluca, Thomas W
AGU, Dec. 2013, English
Dec. 2013 - Dec. 2013

日本の森林土壌の窒素無機化速度―土壌の化学的特性―
浦川梨恵子; 大手信人; 柴田英昭; 渡辺恒大; 福澤加里部; 舘野隆之輔; 菱拓雄; 福島慶太郎; 稲垣善之; 平井敬三; 戸田浩人; 田中健太; 小柳信宏; 服部大地; 中田誠; 小田智基; 三枝伸子; 山尾幸夫; 中西麻美; 榎木勉; 鵜川信
日本地球惑星科学連合2013年大会, May 2013, Japanese, Poster presentation
[Domestic Conference]

Effects of freeze-thaw cycles by winter climate changes on soil nitrogen dynamics in ten temperate forest ecosystems throughout Japanese archipelago
Rieko Urakawa; Hideaki Shibata
US-Japan Joint Seminar on Responses of Catchment Hydrology and Forest Biogeochemistry to Climatic and Environmental Change, 04 Mar. 2013, English, Poster presentation

森林生態系における土壌の窒素動態に冬季気候変動にともなう凍結融解サイクルの変化が及ぼす影響
浦川梨恵子; 柴田英昭; 黒岩 恵; 稲垣善之; 舘野隆之輔; 菱 拓雄; 福澤加里部; 平井敬三; 戸田浩人; 小柳信宏; 中田 誠; 中西麻美; 福島慶太郎; 榎木 勉; 木庭啓介; 諏訪裕一
第124回日本森林学会大会, Mar. 2013, Japanese, Oral presentation
[Domestic Conference]

Effects of slope positions and aspects on seasonal characteristics of nitrogen mineralization in eastern Hokkaido
Hishi Takuo; Urakawa Rieko; Tashiro Naoaki; Maeda Yuka; Shibata Hideaki
The Japanese Forest Society Congress, 2013, THE JAPANESE FORESTRY SOCIETY, Japanese
2013 - 2013, 斜面の位置や方位といった地形要素は土壌窒素(N)の無機化特性に影響する重要な因子である。また，年間N無機化量への休眠期の寄与は無視できないことがわかっているが，地形要素が成長期や休眠期のN動態にどのように影響するのかはわかっていない。 本研究では，北海道東部に位置する九州大学北海道演習林の天然林，人工林の北向き，南向き斜面，谷部において，地形要素やそれに伴う環境条件がN無機化速度(NminR)，純アンモニウム態N生成速度(NH4R)，純硝化速度(NO3R)にどのように影響するのかを調査した。 生育期，休眠期のいずれにおいても，NminRとNO3Rは北向き斜面や谷部で南向き斜面よりも高く，NH4Rは南向き斜面で北向き斜面，谷部よりも高かった。生育期に比べて休眠期ではNO3Rが低下し，NH4Rが増加した。PLS解析の結果，休眠期と生育期では土壌N動態の制御要因は異なっていた。例えばNO3Rは生育期では北斜面の高いミミズ密度，低いC/N比，日射量，地温日格差によって増加するが，休眠期ではミミズの影響は検出されなかった。休眠期のNH4Rは高い日射，地温格差や凍結融解頻度により増加していた。

Comparison of the dynamics of inorganic nitrogen in the soils of natural beech forest and artificial ceder forest - In-vitro additional incubation experiment -
Hattori Daichi; Oyanagi Nobuhiro; Nakata Makoto; Urakawa Rieko; Toda Hiroto
The Japanese Forest Society Congress, 2013, THE JAPANESE FORESTRY SOCIETY, Japanese
2013 - 2013, 異なる硝化ポテンシャルをもつブナ天然林と、隣接するスギ人工林の土壌を用いて、A0層や土壌pHの違いが硝化ポテンシャルに及ぼす影響を明らかにするための室内培養実験を行った。両林分から採取した土壌0～10cmに①CaCO3添加、②A0層の水抽出液をブナ林とスギ林で交換して添加（A0液添加）、③コントロール、④CaCO3＋A0液添加の処理を行い、4週目までの無機態N(NH4-N+NO3-N)濃度を測定した。ブナ林土壌はCaCO3添加でNH4-Nの生成が増加したが、NO3-N生成はどの処理も少なく、pH上昇やスギA0層の由来成分による硝化促進の効果はみられなかった。スギ林はどの処理もNO3-N生成がみられ、CaCO3添加で無機態Nの生成量が増大した。両林分の硝化活性に変化が生じないのは、土壌中の硝化菌の数や活性の変化が少なかったためと考えられる。現実林分の硝化ポテンシャルの違いは、より長期的なA0層由来の成分濃度や土壌pHの変化によってもたらされている可能性が考えられる。

Characteristics of Nitrogen Mineralization Rates and Controlling Factors in Forest Soils in the Japanese Archipelago
Urakawa Rieko; Ohte Nobuhito; Shibata Hideaki; Isobe Kazuo; Oda Tomoki; Watanabe Tsunehiro; Fukuzawa Karibu; Ugawa Shin; Hishi Takuo; Enoki Tsutomu; Tateno Ryunosuke; Fukushima Keitaro; Nakanishi Asami; Saigusa Nobuko; Yamao Yukio; Oyanagi Nobuhiro; Hattori Daichi; Nakata Makoto; Tanaka Kenta; Toda Hiroto; Inagaki Yoshiyuki; Hirai Keizo
AGU(American Geophysical Union) Fall Meeting, 2013, English
2013 - 2013

Response of fine roots to the change in nitrogen mineralization of soil in cool-temperate forest in Hokkaido
Fukuzawa Karibu; Urakawa Rieko; Hishi Takuo; Shibata Hideaki; Miyamoto Toshizumi; Tateno Ryunosuke
The Japanese Forest Society Congress, 2013, THE JAPANESE FORESTRY SOCIETY, Japanese
2013 - 2013, 土壌の窒素動態と植物細根による養分吸収の関係を明らかにするため、細根侵入の有無が土壌の正味窒素無機化量に及ぼす影響を調べた。北海道の多雪・少雪地域に位置する北大雨龍および九大足寄の天然林にてレジンコア法による現地培養を行い、土壌カラムの部分をメッシュにしたイングロスコア式レジンコア（根あり区）と通常のレジンコア（根なし区）との間で窒素無機化量を比較した。2010年11月に雨龍・足寄の両サイトで現地の土壌を用いてミズナラの周囲にレジンコアを埋設し、一部は2011年4月に回収し、残りは8月まで引き続き足寄で野外培養した。培養前後の土壌中の窒素量の差と回収後のイオン交換樹脂中の窒素量の合計値を正味の窒素無機化量（NH4-N生成量、NO3-N生成量）とした。足寄・雨龍土壌での生育期の根なし区における硝化率はそれぞれ43％、1％であった。一方、根あり区においては両土壌の正味窒素無機化量は同程度であったが、足寄土壌でNO3-N生成が、雨龍土壌でNH4-N生成がそれぞれ低下した。生成する窒素の形態の変化に対して、細根は利用しやすい形態の窒素を吸収するという可塑性をもっていることが示された。

1-39 稲わら堆肥連用黒ボク土畑における水・炭素・窒素動態の長期モニタリングとモデリング(1.物質循環・動態)
江口 定夫; 長谷川 周一; 朝田 景; 浦川 梨恵子; 青木 和博; 板橋 直; 中村 乾; 加藤 英孝
日本土壌肥料学会講演要旨集, 08 Aug. 2011, 一般社団法人日本土壌肥料学会, Japanese
08 Aug. 2011 - 08 Aug. 2011

21 農業由来窒素の負荷軽減シナリオによる地下水汚染リスクの評価(関東支部講演会,2010年度各支部会講演要旨)
朝田 景; 江口 定夫; 浦川 梨恵子; 青木 和博; 板橋 直; 中村 乾; 加藤 英孝
日本土壌肥料学会講演要旨集, 08 Aug. 2011, 一般社団法人日本土壌肥料学会, Japanese
08 Aug. 2011 - 08 Aug. 2011

気候変動による積雪変化が森林土壌の物質循環機能に及ぼす影響―全国サイトにおける土壌の化学的性質―
浦川梨恵子; 柴田英昭; 菱拓雄; 稲垣善之; 舘野隆之輔; 福澤加里部; 戸田浩人; 平井敬三; 中西麻美; 福島慶太郎; 中田誠; 小柳信宏; 榎木勉
日本森林学会大会学術講演集(CD-ROM), 25 Mar. 2011, THE JAPANESE FORESTRY SOCIETY, Japanese
25 Mar. 2011 - 25 Mar. 2011

農業集水域を対象とした窒素負荷軽減シナリオによる地下水汚染リスク評価
朝田景; 江口 定夫; 浦川 梨恵子; 青木 和博; 板橋 直; 中村 乾; 加藤 英孝
土肥要旨集, 2011, 一般社団法人日本土壌肥料学会, Japanese
2011 - 2011

Effects of fine roots on soil nitrogen mineralization in cool-temperate forests in Hokkaido
Fukuzawa Karibu; Urakawa Rieko; Hishi Takuo; Shibata Hideaki; Miyamoto Toshizumi; Inoue Takahiro; Tateno Ryunosuke
The Japanese Forest Society Congress, 2011, THE JAPANESE FORESTRY SOCIETY, Japanese
2011 - 2011

P22-5 土壌・地形的要因を考慮した硝酸性窒素による地下水汚染に対する脆弱性評価(ポスター紹介,22.環境保全,2010年度北海道大会)
板橋 直; 浦川 梨恵子; 青木 和博; 江口 定夫; 中村 乾; 加藤 英孝
日本土壌肥料学会講演要旨集, 07 Sep. 2010, 一般社団法人日本土壌肥料学会, Japanese
07 Sep. 2010 - 07 Sep. 2010

4地点の森林土壌における総硝化速度と微生物
黒岩恵; 木庭啓介; 戸田浩人; 楊宗興; 磯部一夫; 妹尾啓史; 柴田英昭; 福澤加里部; 稲垣善之; 舘野隆之輔; 中西麻美; 浦川梨恵子
日本森林学会大会学術講演集(CD-ROM), 02 Apr. 2010, Japanese
02 Apr. 2010 - 02 Apr. 2010

森林生態系の窒素動態に関する土壌培養の地域比較実験
柴田 英昭; 戸田 浩人; 稲垣 善之; 舘野 隆之輔; 木庭 啓介; 中西 麻美; 福澤 加里部; 浦川 梨恵子; 山崎 朱夏; 長谷川 由布子
第121回日本森林学会大会, Apr. 2010, Japanese
Apr. 2010 - Apr. 2010

1-10 北関東地方のスギ・ヒノキ人工林流域からの窒素流出の長期モニタリング(1.物質循環・動態,2009年度京都大会)
浦川 梨恵子; 戸田 浩人; 崔 東寿
日本土壌肥料学会講演要旨集, 15 Sep. 2009, 一般社団法人日本土壌肥料学会, Japanese
15 Sep. 2009 - 15 Sep. 2009

列島スケールでの環境変化が森林表土の窒素無機化速度に及ぼす影響；現地交換培養実験
柴田 英昭; 戸田 浩人; 稲垣 善之; 舘野 隆之輔; 木庭 啓介; 中西 麻美; 浦川 梨恵子; 山崎 朱夏
日本地球惑星科学連合2009年大会, May 2009, Japanese
May 2009 - May 2009

Effects of difference in composting year of litter on plant growth
ichikawa takahiro; ichikawa asuka; urakawa rieko
The Japanese Forest Society Congress, 2009, THE JAPANESE FORESTRY SOCIETY, Japanese
2009 - 2009

Influence of soil processes in the lower slope position to stream water chemistry in the watershed of Japanese cedar and cypress
Urakawa Rieko; Toda Hiroto; Haibara Kikuo
The Japanese Forest Society Congress, 2007, THE JAPANESE FORESTRY SOCIETY, Japanese
2007 - 2007

Numerical calculation of secondary discharge peak from a small watershed using a physically based infiltration simulation
SHIRAKI KATSUSHIGE; SHINOMIYA YOSHIKI; URAKAWA RIEKO; TODA HIROTO; HAIBARA KIKUO
The Japanese Forest Society Congress, 2007, THE JAPANESE FORESTRY SOCIETY, Japanese
2007 - 2007

95年生スギ·ヒノキ人工林小流域における物質の循環と流出
戸田 浩人; 浦川 梨恵子; 小柳 信宏; 生原 喜久雄
日本陸水学会 講演要旨集, 2002, 日本陸水学会, Japanese
2002 - 2002

森林土壌の塩基性陽イオンに及ぼす大気沈着影響の解明―重金属同位体比を利用して―
科学研究費助成事業
Apr. 2026 - Mar. 2029
浦川梨恵子
日本学術振興会, 基盤研究(C), 北海道大学北方生物圏フィールド科学センター, Principal investigator, 26K08906

Estimation of atmospheric deposition load and its effects on nutrient dynamics in forest ecosystems using heavy metal isotopes
Grant-in-Aid for Scientific Research (C)
2019 - 2023
Rieko Urakawa
Principal investigator, Competitive research funding