Environmental Biogeochemistry of Nitrogen in the East Asian Region

Environmental biogeochemistry of nitrogen in the East Asian region 

At present the estimation of regional fluxes of pollutants gives a powerful tool for understanding of man-made changes in different scale, from landscape to a global 

Nitrogen is a key element of many biogeochemical processes and can be both a nutrient limiting the productivity of terrestrial and aquatic ecosystems and a pollutant, which excessive accumulation in biogeochemical food chains leads to many environmental problems. The main anthropogenic sources of nitrogen pollution are related to fertilizer application, waste production and emission of gaseous species. 

The abatement strategy for reduction of N emission and deposition as well as decreasing of undesirable losses from agroecosystems due to excessive application of fertilizers has to be based on the calculations of its regional biogeochemi-cal budgets with quantitative parameterization of different fluxes in terrestrial and aquatic ecosystems. 

The four main river basins are placed on this area Amur, Huanghe, Yangtze and Mekong rivers. There are also plenty of middle and small rivers in East Asia. These rivers are drained into East (Japan), Yellow, East China and South East China Seas of the Pacific ocean. 

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