Abstract: Vegetation coverage and water area were calculated based on EOS/MODIS and FY-3 /MERSI satellite data,combined with surface classification data,meteorological data,nighttime light image,Hunan statistical yearbook data,through quantitative calculation,to explore the climatic and anthropogenic causes of vegetation coverage decline of different surface types in Dongting lake area.The results showed that the decrease of vegetation coverage in Dongting lake area from 2000 to 2019 was mainly concentrated in paddy fields,population gathering areas and wetland areas;From the perspective of climate impact,vegetation decline in paddy fields and population gathering areas was closely related to less precipitation in May to August,the decreased area of wetland vegetation coverage was related to climate change and water area,the decrease degree of vegetation coverage was more closely related to the change of water area,and water storage in the Three Gorges could reduce the impact of water on wetland vegetation.From the perspective of human factors,the vegetation coverage of paddy field,population gathering area and wetland was respectively affected by the agricultural planting structure,regional GDP,nighttime light index,and poplar cutting.

Key words: Dongting lake, vegetation coverage, decline, cause, water area, night time light index, remote sensing