Ken’ichi Osaka

Biogeochemistry of nitrous oxide in groundwater in a forested ecosystem elucidated by nitrous oxide isotopomer measurements

Keisuke Koba, Ken’ichi Osaka, Y. Tobari et al. · Geochimica et Cosmochimica Acta · 2009 · 105 citations

Organic Geochemistry, Biogeochemistry, Nitrous Oxide +9

Spatial distribution of nitrate sources of rivers in the Lake Biwa watershed, Japan: Controlling factors revealed by nitrogen and oxygen isotope values

Nobuhito Ohte, Ichiro Tayasu, Ayato Kohzu et al. · Water Resources Research · 2010 · 78 citations · Full text

Biogeochemistry, Eutrophication, Engineering +12

Hydrological influences on spatiotemporal variations of <i>δ</i>¹⁵N and <i>δ</i>¹⁸O of nitrate in a forested headwater catchment in central Japan: Denitrification plays a critical role in groundwater

Ken’ichi Osaka, Nobuhito Ohte, Keisuke Koba et al. · Journal of Geophysical Research Atmospheres · 2010 · 56 citations · Full text

Engineering, δ 15, Land Degradation +18

Identification of Phosphorus Sources in a Watershed Using a Phosphate Oxygen Isoscape Approach

Takuya Ishida, Yoshitoshi Uehara, Tomoya Iwata et al. · Environmental Science & Technology · 2019 · 49 citations

Hydrologic controls on nitrous oxide production and consumption in a forested headwater catchment in central Japan

Ken’ichi Osaka, Nobuhito Ohte, Keisuke Koba et al. · Journal of Geophysical Research Atmospheres · 2006 · 27 citations

Eutrophication, Engineering, Forest Hydrology +16