Spatio-temporal variations of evapotranspiration in Poyang Lake Basin using MOD16 products
Under the support of ArcGIS spatial analysis module, this paper mainly aims at mod16-ET product to conduct a systematic research on the spatial and temporal characteristics in the Poyang Lake Basin during 2000-2010. The results indicated that MOD16-ET product is more applicable for the analysis of spatio-temporal distribution characteristic of evapotranspiration. In addition to water bodies and wetlands, the average ET from 2000 to 2010 changed obviously, and the sudden ascent happened in 2003 and 2007, which exceeded the average ET value by 49.28 mm and 46.71 mm respectively. The spatial distribution of the ET had obvious regional characteristics. ET values in the central part of the basin are higher than those in the surrounding areas in terms of their spatial distribution, especially in the high vegetation coverage areas. Furthermore, the seasonal variation of ET shows a unimodal pattern, and its peak value occurs in July. The spatial distribution of ET is related to land cover characteristics, which have effect on the ET distribution in the Poyang Lake Basin, and the order of ET intensity by land cover types is woodland > grassland > farmland > unused land > building land. The results of the study are of great theoretical and practical significance to analyses of the cause of drought and effective use of water resources across the Poyang Lake Basin.
MOD 16Poyang Lake Basinevapotranspirationspatio-temporal variationland-cover type
NETL
NSTL
万方数据
维普
