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Dynamic Change of Ecological Appropriation in the Three North-Eastern Provinces

LI Ming-Sheng1,2,TONG Lian-Jun1 (1. Northeast Institute of Geography and Agricultural Ecology,CAS,Changchun 130012,China; 2. Graduate University of Chinese Academy of Sciences,Beijing 100049,China)  
The ecological appropriation values of the three north-eastern provinces are calculated with the constant yield method and variable yields method from 1978 to 2004 in the paper and the results were analyzed. The results showed that the ecological appropriation was increasing in the period,and the yields of all kind of lands play an important role in the course. The increase trend may slow down,but the yield of forest land increases little. It is a choke point.
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