The Variation of Evapotraspiration and the Impacts on It in the Source Region of the Yangtze River

Abstract

Abstract:

The source region of the Yangtze River has experienced ecohydrology deterioration in lastest 2 to 3 decades. To analyse the region hydrological variations, exploit Surface Energy Balance System (SEBS), based on NOAA remote sensing data, and the meteorological data provided by local meteorological stations, we calculated the annual evapotranspiration (ET) in the source region of the Yangtze River from 1991 to 2001. Employing linear regression method to count the evapotranspiration trends in every pixel, we analysed the interannual variation of evapotranspiration spatially. Using Geographic Information System, the impacts of temperature, surface land temperature, precipitation and NDVI (vegetation index) on evapotranspiration variation have been assessed. The results show that evapotraspiration increases at the speed of 6.8 mm/a. The rising temperatures with the Global Warming are the main factors to lead to the interannual evapotraspiration increasing in the lastest two decades. In space, evapotranspiration increases at the left bank of the Yangtze River, which is sunny aspect, while the evapotranspiration decreases at the right bank of the river, back sides of the mountains. Precipitation and vegetation coverage have a good positive correlation with evapotranspiration respectively.Evapotranspiration in the southeast of the region with large rainfall and relatively dense vegetation is larger than that in the northwest of the region with small rainfall and sparse vegetation. Findings of this study may be significant for finding out relationship between water resources and climate changes.

Key words: evapotranspiration, SEBS, NDVI, source region of the Yangtze River

CLC Number:

P332.2

PEI Chao-Zhong, QIAN Kai-Zhu, LV Jing-Jing, XIN Yuan-Hong. The Variation of Evapotraspiration and the Impacts on It in the Source Region of the Yangtze River[J]. Geoscience, 2010, 24(2): 362-368.

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