干旱区生态环境知识资源中心

This paper selected 250 periods of MODIS EVI data from 2000 and 2010 in the Ebinur basin, the maximum and average of EVI of each year were chosen as indicators to analysis vegetation changing trends. Simultaneously, the Landsat TM data of Ebinur basin was utilized as the source data. The Maximum likelihood method was chosen to extract the water surface area of Ebinur to dig the changing trends of water surface area. Three types of trend were observed null, positive and negative. Over the study area the trend is insignificant, and the positive and negative rate of vegetation cover is 9.65% and 9.77% respectively. Based on a land cover map and DEM data, the analysis has shown that the negative areas are mainly located at the high elevation grass and lower elevation sand, especially the vast sand in the north of Ebinur Lake and downstream of Guertu River. Additionally, the positive and negative rate of vegetation cover in the Haloxylon forest protected area of Ganjia Lake are 16.17% and 1.75%, which shows a vegetation cover degradation trend. Nonetheless, the tendency of such artificial vegetation as farmland or green space, whose rates of negative and positive are 4.14% and 55.75% respectively, appear more favorable. After 2005, the surface area of Ebinur Lake is greatly decreased than before, Ebinur Lake gradually shrinks at the rate of 50km(2/)a, and large-area sand riverbeds around the lake are exposed. In general, the currency of artificial vegetation of Ebinur basin in recent years has an optimism momentum, and nature vegetation is significant degradation as well as water area of Ebinur Lake. And trend of desertification in such area is deteriorating.