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Ken'ichi Osaka
Ken'ichi Osaka
University of Shiga Prefecture
Verified email at ses.usp.ac.jp
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Year
Biogeochemistry of nitrous oxide in groundwater in a forested ecosystem elucidated by nitrous oxide isotopomer measurements
K Koba, K Osaka, Y Tobari, S Toyoda, N Ohte, M Katsuyama, N Suzuki, ...
Geochimica et Cosmochimica Acta 73 (11), 3115-3133, 2009
1022009
Spatial distribution of nitrate sources of rivers in the Lake Biwa watershed, Japan: controlling factors revealed by nitrogen and oxygen isotope values
N Ohte, I Tayasu, A Kohzu, C Yoshimizu, K Osaka, A Makabe, K Koba, ...
Water Resources Research 46 (7), 2010
692010
Hydrological influences on spatiotemporal variations of δ15N and δ18O of nitrate in a forested headwater catchment in central Japan: Denitrification plays a …
K Osaka, N Ohte, K Koba, C Yoshimizu, M Katsuyama, M Tani, I Tayasu, ...
Journal of Geophysical Research: Biogeosciences 115 (G2), 2010
562010
Identification of phosphorus sources in a watershed using a phosphate oxygen isoscape approach
T Ishida, Y Uehara, T Iwata, AP Cid-Andres, S Asano, T Ikeya, K Osaka, ...
Environmental science & technology 53 (9), 4707-4716, 2019
322019
Hydrologic controls on nitrous oxide production and consumption in a forested headwater catchment in central Japan
K Osaka, N Ohte, K Koba, M Katsuyama, T Nakajima
Journal of Geophysical Research: Biogeosciences 111 (G1), 2006
292006
Effects of soil water status on the spatial variation of carbon dioxide, methane and nitrous oxide fluxes in tropical rain-forest soils in Peninsular Malaysia
M Itoh, Y Kosugi, S Takanashi, S Kanemitsu, K Osaka, Y Hayashi, M Tani, ...
Journal of Tropical Ecology 28 (6), 557-570, 2012
242012
Upward diffusion of nitrous oxide produced by denitrification near shallow groundwater table in the summer: a lysimeter experiment
K Minamikawa, S Nishimura, Y Nakajima, K Osaka, T Sawamoto, K Yagi
Soil Science and Plant Nutrition 57 (5), 719-732, 2011
232011
Nitrogen availability in the taiga forest ecosystem of northeastern Siberia
AS Popova, N Tokuchi, N Ohte, MU Ueda, K Osaka, TC Maximov, ...
Soil science and plant nutrition 59 (3), 427-441, 2013
192013
Non-carcinogenic risk assessment of groundwater in South Gobi, Mongolia
K Nakazawa, O Nagafuchi, K Okano, K Osaka, E Hamabata, ...
Journal of Water and Health 14 (6), 1009-1018, 2016
172016
Influence of bedrock groundwater on streamflow characteristics in a volcanic catchment
M Fujimoto, N Ohte, M Kawasaki, K Osaka, M Itoh, I Ohtsuka, M Itoh
Hydrological Processes 30 (4), 558-572, 2016
172016
Evaluation of nutrient loads from a mountain forest including storm runoff loads
T Kunimatsu, T Otomori, K Osaka, E Hamabata, Y Komai
Water science and technology 53 (2), 79-91, 2006
172006
Factors characterizing phosphate oxygen isotope ratios in river water: an inter-watershed comparison approach
J Ide, T Ishida, AP Cid-Andres, K Osaka, T Iwata, T Hayashi, M Akashi, ...
Limnology 21 (3), 365-377, 2020
142020
Spatial and temporal variability of soil respiration rate at a small watershed revegetated with Japanese cypress.
T Mitani, Y Kosugi, K Osaka, S Ohkubo, S Takanashi, M Tani
132006
Atmospheric nitrate leached from small forested watersheds during rainfall events: Processes and quantitative evaluation
K Osaka, T Kugo, N Komaki, T Nakamura, K Nishida, O Nagafuchi
Journal of Geophysical Research: Biogeosciences 121 (8), 2030-2048, 2016
122016
Nitrogen and oxygen isotope enrichment factors of nitrate at different denitrification rates in an agricultural soil
K Osaka, Y Nakajima, K Suzuki, S Eguchi, H Katou
Soil science and plant nutrition 64 (5), 558-565, 2018
112018
Effect of dissolved oxygen on nitrogen and phosphorus fluxes from lake sediments and their thresholds based on incubation using a simple and stable dissolved oxygen control method
K Osaka, R Yokoyama, T Ishibashi, N Goto
Limnology and Oceanography: Methods 20 (1), 1-14, 2022
102022
Photosynthesis and respiration of managed C3 turfgrass fields under various light conditions
小杉緑子, 尾坂兼一, 伊藤雅之, 高梨聡, 松原隆志
農業気象 66 (3), 163-171, 2010
92010
Nitrogen contamination of shallow groundwater in Katmandu Valley, Nepal
T NAKAMURA, KEI NISHIDA, F KAZAMA, KENI OSAKA, SK CHAPAGAIN
日本水文科学会誌 44 (4), 197-206, 2014
72014
Temporal and spatial variations of soil carbon dioxide, methane, and nitrous oxide fluxes in a Southeast Asian tropical rainforest
M Itoh, Y Kosugi, S Takanashi, Y Hayashi, S Kanemitsu, K Osaka, M Tani, ...
Biogeosciences Discussions 7 (5), 6847-6887, 2010
72010
Separate estimation of N export into baseline N leakage without disturbance and N loss due to insect defoliation in a pine forest watershed in central Japan
T Naoko, O Nobuhito, O Ken’ichi, K Masanori
Environmental monitoring and assessment 185, 855-863, 2013
62013
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