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Dynamics of Saline-alkali Land and Its Ecological Regionalization in Western Songnen Plain; China[J] YANG Jiuchun1; 2; ZHANG Shuwen1; LI Ying1; BU Kun1; ZHANG Yubo3; CHANG Liping1; ZHANG Yangzhen1 (1. Northeast Institute of Geography and Agroecology; Chinese Academy of Sciences; Changchun 130012; China; 2. Graduate University of the Chinese Academy of Sciences; Beijing 100049; China; 3. Software College; Jilin University; Changchun 130012; China) Chinese Geographical Science 2010, 02
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