Desertification dynamic and the relative roles of climate change and human activities in desertification in the Heihe River Basin based on NPP

作     者：Wei ZHOU ZhengGuo SUN JianLong LI ChengCheng GANG ChaoBin ZHANG 

作者机构：School of Life ScienceNanjing University 

出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)

年 卷 期：2013年第5卷第4期

页      面：465-479页

核心收录：

学科分类：07[理学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学] 

基　　金：supported by the National Basic Research Program of China(2010CB950702) the National High Technology Research and Development Program of China(2007AA10Z231) the National Natural Science Foundation of China(40871012,J1103512,J1210026) the Asia-Pacific Network(ARCP-2012-SP25-Li) the Australian Agency for International Development(64828) 

主　　题：desertification net primary productivity (NPP) climate change human activities quantitative assessment Heihe River Basin 

摘      要：Relative roles of climate change and human activities in desertification are the hotspot of research on desertification dynamic and its driving *** overcome the shortcomings of existing studies,this paper selected net primary productivity （NPP） as an indicator to analyze desertification dynamic and its impact *** addition,the change trends of actual NPP,potential NPP and HNPP （human appropriation of NPP,the difference between potential NPP and actual NPP） were used to analyze the desertification dynamic and calculate the relative roles of climate change,human activities and a combination of the two factors in *** this study,the Moderate Resolution Imaging Spectroradiometer （MODIS）-Normalised Difference Vegetation Index （NDVI） and meteorological data were utilized to drive the Carnegie-Ames-Stanford Approach （CASA） model to calculate the actual NPP from 2001 to 2010 in the Heihe River *** NPP was estimated using the Thornthwaite Memorial *** showed that 61％ of the whole basin area underwent land degradation,of which 90.5％ was caused by human activities,8.6％ by climate change,and 0.9％ by a combination of the two *** the contrary,1.5％ of desertification reversion area was caused by human activities and 90.7％ by climate change,the rest 7.8％ by a combination of the two ***,it was demonstrated that 95.9％ of the total actual NPP decrease was induced by human activities,while 69.3％ of the total actual NPP increase was caused by climate *** results revealed that climate change dominated desertification reversion,while human activities dominated desertification ***,the relative roles of both climate change and human activities in desertification possessed great spatial ***,ecological protection policies should be enhanced in the Heihe River Basin to prevent desertification expansion under the condition of climate change.