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Satellite-Based Analysis of Evapotranspiration and Water Balance in the Grassland Ecosystems of Dryland East Asia
Xia J. Z.; Liang S. L.; Chen J. Q.; Yuan W. P.; Liu S. G.; Li L. H.; Cai W. W.; Zhang L.; Fu Y.; Zhao T. B.; Feng J. M.; Ma Z. G.; Ma M. G.; Liu S. M.; Zhou G. S.; Asanuma J.; Chen S. P.; Du M. Y.; Davaa G.; Kato T.; Liu Q.; Liu S. H.; Li S. G.; Shao C. L.; Tang Y. H.; Zhao X.
Source PublicationPlos One
2014
Volume9
Issue5
KeywordGross Primary Production Net Primary Production Land-cover China Modis Climate Precipitation Improvements Evaporation Droughts
AbstractThe regression tree method is used to upscale evapotranspiration (ET) measurements at eddy-covariance (EC) towers to the grassland ecosystems over the Dryland East Asia (DEA). The regression tree model was driven by satellite and meteorology datasets, and explained 82% and 76% of the variations of ET observations in the calibration and validation datasets, respectively. The annual ET estimates ranged from 222.6 to 269.1 mm yr(-1) over the DEA region with an average of 245.8 mm yr(-1) from 1982 through 2009. Ecosystem ET showed decreased trends over 61% of the DEA region during this period, especially in most regions of Mongolia and eastern Inner Mongolia due to decreased precipitation. The increased ET occurred primarily in the western and southern DEA region. Over the entire study area, water balance (the difference between precipitation and ecosystem ET) decreased substantially during the summer and growing season. Precipitation reduction was an important cause for the severe water deficits. The drying trend occurring in the grassland ecosystems of the DEA region can exert profound impacts on a variety of terrestrial ecosystem processes and functions.
Indexed BySCI
Language英语
ISSN1932-6203
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/29503
Collection历年回溯文献
Recommended Citation
GB/T 7714
Xia J. Z.,Liang S. L.,Chen J. Q.,et al. Satellite-Based Analysis of Evapotranspiration and Water Balance in the Grassland Ecosystems of Dryland East Asia. 2014.
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