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Vegetation controls on surface energy partitioning and water budget over China
Journal of Hydrology ( IF 6.4 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jhydrol.2020.125646 Xin Lan , Yao Li , Rui Shao , Xiaohong Chen , Kairong Lin , Linyin Cheng , Hongkai Gao , Zhiyong Liu
Journal of Hydrology ( IF 6.4 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jhydrol.2020.125646 Xin Lan , Yao Li , Rui Shao , Xiaohong Chen , Kairong Lin , Linyin Cheng , Hongkai Gao , Zhiyong Liu
Abstract Understanding how biophysical processes respond to the surface energy partitioning and water budget is essential for modeling land surface processes. In general, evapotranspiration (ET) associated with vegetation dynamics can function as a vital nexus of the surface energy partitioning and water budget. Here, a dual-source ET model, the GIS-based Priestley-Taylor Jet Propulsion Laboratory (GIS-based PT-JPL) model, was constructed by incorporating a component of vegetation dynamics for quantifying the influences of vegetation greening on surface energy partitioning and water budget in mainland China from 1982 to 2015. To evaluate the effect of vegetation greening on evaporative water consumption, two simulation scenarios were compared: with and without revegetation. The results reveal that the increased Leaf Area Index led to a reduction in surface albedo by an average rate of −0.001 yr−2 from 1982 to 2015. The net terrestrial radiation exhibited a notable upward trend (at a rate of 0.0594 W·m−2·yr−2), which could be caused by the decrease in surface albedo and the positive greenhouse effect. The increase in net terrestrial radiation enhanced both sensible and latent heat flux, thus leading to a significant growing trend of ET (at a rate of 0.39 mm·yr−2) over mainland China. The results of two simulation scenarios show that the evaporative water consumption with revegetation was 5.1% higher than that without revegetation. And the ratio of water yield in 10 of 11 river basins decreased around 1.6–19.4% over the past three decades for revegetation. These findings broaden the current knowledge about how to ensure ecologically sustainable restoration and manage the long-term revegetation strategy.
更新日期：2020-10-01
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