%0 Journal Article
%T Spatiotemporal characteristics of MODIS NDVI in Hulunber Grassland<br>呼伦贝尔草原MODIS NDVI的时空变化特征
%A ZHANG Hong-bin
%A YANG Gui-xia
%A WU Wen-bin
%A LI Gang
%A CHEN Bao-rui
%A XIN Xiao-ping
%A <br>张宏斌
%A 杨桂霞
%A 吴文斌
%A 李刚
%A 陈宝瑞
%A 辛晓平
%J 应用生态学报
%D 2009
%I 
%X Time-series MODIS NDVI datasets from 2000 to 2008 were used to study the spatial change trend,fluctuation degree,and occurrence time of the annual NDVI_(max) of four typical grassland types,i.e.,lowland meadow,temperate steppe,temperate meadow steppe,and upland meadow,in Hulunber Grassland.In 2000-2008,the vegetation in Hulunber Grassland presented an obvious deterioration trend.The mean annual NDVI_(max) of the four grassland types had a great fluctuation,especially in temperate steppe where the maximum change in the mean value of annual NDVI_(max) approximated to 50%.As for the area change of different grade grasslands,the areas with NDVI_(max) between 0.4 and 1 accounted for about 91% of the total grassland area,which suggested the good vegetation coverage in the Grassland.However,though the areas with NDVI_(max) values in(0.4,0.8]showed an increasing trend,the areas with NDVI_(max) values in(0.2,0.4]and(0.8,1]decreased greatly in the study period.Overall,the deteriorating grassland took up about66.25 % of the total area,and the restoring grassland took the rest.There was about 62.85 % of the grassland whose NDVI_(max) occurred between the 193rd day and the 225th day in each year,indicating that this period was the most important vegetation growth season in Hulunber Grassland.
%K Hulunber Grassland
%K MODIS
%K spatiotemporal characteristics<br>呼伦贝尔草原
%K ODIS
%K 空特征
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=F416CF3E36F2DA273A15F3E389968704&yid=DE12191FBD62783C&vid=A04140E723CB732E&iid=708DD6B15D2464E8&sid=3002B61541E89B7F&eid=01724EF515FB9C1C&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=3&reference_num=0