Abstract
Abstract This paper studies on Poyang Lake natural wetlands. we calculation each month's vegetation area in Poyang Lake that according to cloudless images of MODIS in 2009. And it had a quantitative analysis for the changes of annual by Poyang Lake wetland vegetation with time; space; and the water level. Poyang Lake wetland vegetation is mainly located in the delta of the river lower reaches. The area is changing with month, each year there are two peaks. Before the flood season that the vegetation area increase from spring to April and May. Entering the flood season, the area had been decreased by water level raised; after season, the area increase again with water level dropped. To the autumn and winter, the areas decreased cause of vegetation withered.
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