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Spatiotemporal variations of vegetation cover on the Chinese Loess Plateau(1981―2006):Impacts of climate changes and human activities[J]. XIN ZhongBao1,2, XU JiongXin1 & ZHENG Wei1, 2 1 Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China.Science in China(Series D:Earth Sciences). 2008(01)