Analysis on the variation data of Enhanced Vegetation Index (EVI) from 2000 to 2009 found that the vegetation coverage was obviously increasing and the vegetation activity was enhancing in China during the past ten years.The characteristics of interannual and interseasonal vegetation coverage variation were as follows:(1) the area of vegetation coverage was increasing while the area of bare land was decreasing;(2) the mean EVI per unit land either in vegetation coverage areas or in the average areas of the whole country was increasing in the past ten years;(3) vegetation activity enhanced obviously in growing seasons (summer,spring),and the growth rate of EVI was ordered according to season as summer＞spring＞autumn＞winter.The spatial variation features of vegetation coverage show that although the vegetation coverage presents increasing trend in China,the spatial difference exists.The increasing of EVI around China could be caused because of:(1) the increasing temperature and precipitation in spring;(2) large forestry ecological construction projects.
国家科技期刊平台
NSTL
维普
万方数据
