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Using a nitrogen balance model based on statistical data, nitrogen loads due to food production and consumption and energy production were estimated for each 0.5°×0.5° grid cell in the 13 countries of eastern Asia from 1961 to 2002. Groundwater quality was estimated with a simple first-order reaction model. Total nitrogen load, including natural nitrogen fixation, increased by a factor of 3.8 between...
We created a numerical model to evaluate the anthropogenic nitrogen load on the environment and the nitrogen concentration in river water on a 0.5 o x 0.5 o scale. We estimated the nitrogen load of each country in East Asia from FAO statistics on fertilizer consumption, food balance sheet data, and grid data of NO x emissions due to fossil fuel combustion. For China, province...
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