Comprehensive evaluation of ecosystem health of East Dongting Lake Wetland based on remotely sensed images

Nowadays, Dongting Lake Wetland is facing with a series of ecological problems such as ecological deterioration, biodiversity reduction, ecological adjustment function decreasing. This study took the East Dongting Lake wetland as research area, and comprehensively evaluated the health status of wetland ecosystem by using of CBERS remotely sensed images. Firstly, the model of decision tree for classification was built by analyzing the spectral features of remotely sensed images, and extracted out the distribution area of different ecosystems such as rivers, freshwater lakes, freshwater marshes, poplar dominant wetland and reed dominant wetland, based on remotely sensed images of dry season and wet season in different years, and the spatial distribution map of wetland types in the East Dongting Lake of different phases were obtained. Then, health status evaluation indices and correlative evaluation system of the East Dongting Lake wetland were set up, and the health status of the East Dongting Lake wetland in different phases were evaluated and graded. The reasons of the deterioration of the East Dongting Lake wetland were obtained by investigation. The research result can provide the scientific decision-making basis for protection of biodiversity and regional ecological security in the East Dongting Lake.