| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Research Abstract |
This study aimed to elucidate the factors controlling stream nitrate concentration and its seasonality, and annual nitrogen loss in several forested watersheds with various climatic conditions. Nitrate concentration in streamwater was not related with annual rainfall and atmospheric nitrogen deposition, while its seasonality was controlled by rainfall and snowfall pattern. Simulating nitrogen cycling and loss using PnET -CN model, which was developed in northern America and modified with data collected in this study, revealed that not only hydrological processes, but also land use history until at least 100 years can be important for more precise prediction of nitrogen loss.
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