Research on the Evolution of Aquatic Vegetation in Wuliangsuhai Wetland of Inner Mongolia, China

Abstract

In this paper, we selected the largest lakes wetlands Wuliangsuhai which in the same latitude of earth as study object. The TM satellite imagery of 2001 and 2010 was the data source. By Sensor calibrating and geometric precision correcting of information preprocessing, I analysis of different bands, spectral values, normalized difference vegetation index NDVI and water index NDWI characteristics on the basis of the establishment of the decision tree, classify information, and extract Wuliangsuhai aquatic vegetation information. This research has got a good extraction aquatic vegetation results of lakes and wetlands; the classification accuracy was 91.92% and 88.31% respectively. The results showed that wetland submerged plants area of 2010 in Wuliangsuhai lakes shrank by 67.81 % compared to 2001, and the water surface area of lake increased by 60.67%. These reflect that the eutrophication get a degree of control in Wuliangsuhai lakes wetland.