Advance in the Study of the Nitrogen Input Process of Wetland Ecology System
sun zhi-gao~(1; 2; 3); liu jing-shuang~(1; 2); wang jin-da~(1; 2); li xin-hua~(1; 3); yang ji-song~(1; 3)(1.northeast institute of geography and agricultural ecology; cas; changchun 130012; 2.research center of wetland; cas; changchun 130012; 3.graduate school of chinese academy sciences; beijing 100039; china)
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