Actual ET modelling based on the Budyko framework and the sustainability of vegetation water use in the loess plateau
Actual ET modelling based on the Budyko framework and the sustainability of vegetation water use in the loess plateau
复制标题
基于Budyko框架的实际ET模型与黄土高原植被水分利用的可持续性
DOI：
10.1016/j.scitotenv.2016.11.163
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发表时间：
2017-02-01
影响因子：
9.8
通讯作者：
Wang, Yubao
中科院分区：
文献类型：
--
作者：
Gao, Xuerui;Sun, Miao;Wang, Yubao
近年来，在自然因素和人为保护措施的共同作用下，黄土高原的生态环境得到了显著改善，但也带来了一些与水有关的问题。保持降水与耗水量的平衡是生态修复可持续发展的重要基础。本研究利用Budyko框架模拟了161个子流域1990-2014年间的实际用水量。在模拟结果的基础上，分析了1990-2014年黄土高原水分平衡的演变特征。结果表明，随着植被覆盖度的增加，区域降水量和实际蒸散量均呈显著增加趋势，降水量平均增加速率为1.91 mm/a，大于实际蒸散量的增加速率1.34 mm/a。为进一步反映黄土高原的水分平衡状况，采用蒸散系数(ECC)定量表示植被耗水与总降水量的比值。在1990年至1999年、2000年至2004年、2005年至2009年和2010年至2014年四个子期内，环境容积率的平均值分别为0.868、0.863、0.851和0.837。分析表明，随着植被的恢复和生态的恢复，蒸散量在总降水量中所占的比例不断下降，产水量在总降水量中所占的比例不断增加。因此，目前黄土高原大部分地区植被水分利用具有较强的可持续性。(C)2016年，由爱思唯尔出版。
Jointly influenced by the natural factors and the artificial protection measures, the ecological environment of Loess Plateau has been significantly improved in recent years, but which has already brought about some water-related problems. To maintain the balance between precipitation and water consumption is an important foundation for sustainable development of the ecology remediation. This study used Budyko Framework to simulate the actual water consumption of 161 sub-basins from 1990 to 2014. Based on the simulation results, the research also analyzed the evolution characteristics of water balance in Loess Plateau from 1990 to 2014. Results show that, with the increase of vegetation coverage, the regional precipitation and actual evapotranspiration were both showing a significant increasing trend, and the increasing rate of precipitation was 1.91 mm/a on average, which was greater than the increasing rate of actual evapotranspiration of 1.34 mm/a. To further demonstrate the water balance regime in Loess Plateau, the evapotranspiration coefficient (ECC) was used to quantitatively indicate the ratio of the vegetation water consumption and the total precipitation. The average values of ECC were 0.868, 0.863, 0.851 and 0.837 respectively in four sub-periods of 1990-1999, 2000-2004, 2005-2009 and 2010-2014. The above analyses indicate that with the vegetation recovery and ecological restoration, the percentage of evapotranspiration in the total precipitation is keeping decreasing and in turn the percentage of water yield in the total precipitation is keeping increasing. Consequently, it seems more sustainable for vegetation water use in most areas of Loess Plateau currently. (C) 2016 Published by Elsevier B.V.