Japan Geoscience Union Meeting 2014

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Oral

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS21_28PM2] Biogeochemistry

Mon. Apr 28, 2014 4:15 PM - 6:00 PM 511 (5F)

Convener:*Muneoki Yoh(Tokyo University of Agriculture and Technology), Hideaki Shibata(Field Science Center fot Northern Biosphere, Hokkaido University), Naohiko Ohkouchi(Japan Agency for Marine-Earth Science and Technology), Youhei Yamashita(Faculty of Environmental Earth Science, Hokkaido University), Chair:Rota Wagai(National Institute for Agro-Environmental Sciences, Carbon & Nutrient Cycling Division), Kazuya Nishina(National Institute for Enviromental Studies), Yoshiyuki Inagaki(Forestry and Forest Products Research Institute), Kazumichi Fujii(Forestry and Forest Products Research Institute)

5:30 PM - 5:45 PM

[MIS21-24] The availability of atmospheric nitrate in a forested ecosystem

*Ken'ichi OSAKA1, Naoto KOMAKI1, Yuya KAWAMURA1, Tetsuya MURATA1, Tatsuro KUGO1, Takashi NAKAMURA2, Kei NISHIDA2, Osamu NAGAFUCHI1 (1.University of Siga prefecture, school of environmental science, 2.University of Yamanashi, ICRE)

Keywords:forested watershed, stable isotope, nitrate, atmospheric deposition

Nitrogen is an important element for forest ecosystems; shortage of nitrogen limits plant growth [Vitousek andHowarth, 1991], however, nitrogen discharged from forested ecosystems link to various environmental problems, such as eutrophication of aquatic ecosystems and deterioration of drinking water quality. Recently, atmospheric nitrogen deposition into terrestrial ecosystems is increasing [Galloway et al., 2008]. However, influence of the increase of atmospheric nitrogen deposition on forested ecosystem is not clear because the interaction between nitrogen input/output and inner nitrogen cycle is not sufficiently understood. In this study, to clarify the interaction between nitrogen input/output and inner nitrogen cycle, we investigate the atmospheric nitrate discharge rate from forested watershed and discuss the availability of atmospheric nitrate deposited into forested watersheds.