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Analysis of Land Use Type Changing of Qingshuihe Watershed in Loess Plateau and Ecosystem Service Value
WANG Xiaoyan, SONG Qingfeng, BI Huaxing, GAO Lubo, LIU Lixia, ZHU Yue, XU Huasen, BAO Biao
Forest and Grassland Resources Research . 2011, (5): 89 -93 .