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《Arid Land Geography》 2010-02
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Dynamically monitoring of vegetation cover in 2000-2008 of Irtysh River Valley of Central Asia with remote sensing

LI Bao-ming1,3,YANG liao1,ZHU Chang-ming1,2,LIU Ping1,3,FANg Hui1(1 Xinjiang Institute of Ecology and Geography,CAS,Urumqi 830011,Xinjiang,China;2 Institute of Remote Sensing Application,CAS,Beijing 100101,China;3 Graduate University of Chinese Academy of Sciences,Beijing 100049,China)  
In this paper,the MODIS 500 m data of the Irtysh River basin of Central Asia from 2000 to 2008 was used to analyze the NDVI's seasonal variation regularities of the regions with different vegetation cover degrees.The annually largest value of NDVI obtained with synthesis method was represented as the NDVI value of vegetation in the best period of the year.The mixed-pixel decomposition model was applied to calculate the vegetation cover grades of the study area.According to their magnitude,the vegetation cover grades were divided into five levels: no vegetation cover,extremely low vegetation cover,low vegetation cover,media vegetation cover,superior vegetation cover and extremely high vegetation cover.The results show that the vegetation cover grades of the research area were reduced from 2000 to 2003,and became rising from 2003.The 2007 vegetation cover grade was nearly as the same as 2002's.The 2008 vegetation cover grade was reduced too much and it was the lowest in the nine years.The region with high vegetation cover grade distributed in the mountainous area with flourishing forest in its northeast and in the plain in its northwest,while the region with low vegetation cover grade distributed in the arid grassland in its middle.The inter-annual variation of the vegetation cover grade in the low vegetation grade area is more obvious than that in the high vegetation grade area.
【Fund】: 中国科学院重要方向性项目(KZCX2-YW-307);; 国家自然科学基金(40730633);; 国家支撑计划项目(2008BAB42B09-3)资助
【CateGory Index】: TP79
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