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Changes in permafrost ecosystem under the influences of human engineering activities and its enlightenment to railway construction[J] WANG Genxu1;2; YAO Jinzhong1; GUO Zhenggang1; WU Qingbo1 & WANG Yibo2 1. State Key Laboratory of Frozen Soil Engineering;Cold and Arid Re-gions Environmental and Engineering Research Institute; Chinese Academy of Sciences;Lanzhou 730000;China; 2. MOE Key Laboratory of Western Chinas Environmental Systems; Lanzhou University;Lanzhou 730000;China Chinese Science Bu
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