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| Attribution analysis based on Budyko hypothesis for land evapotranspiration change in the Loess Plateau, China |
HE Guohua1,2, ZHAO Yong1,2,*( ), WANG Jianhua1,2, GAO Xuerui3, HE Fan1,2, LI Haihong1,2, ZHAI Jiaqi1,2, WANG Qingming1,2, ZHU Yongnan1,2 |
1State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China
2 China Institute of Water Resources and Hydropower Research, Beijing 100038, China
3Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China |
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Abstract Land evapotranspiration (ET) is an important process connecting soil, vegetation and the atmosphere, especially in regions that experience shortage in precipitation. Since 1999, the implementation of a large-scale vegetation restoration project has significantly improved the ecological environment of the Loess Plateau in China. However, the quantitative assessment of the contribution of vegetation restoration projects to long-term ET is still in its infancy. In this study, we investigated changes in land ET and associated driving factors from 1982to 2014 in the Loess Plateau using Budyko-based partial differential methods. Overall, annual ET slightly increased by 0.28 mm/a and there were no large fluctuations after project implementation. An attribution analysis showed that precipitation was the driving factor of inter-annual variability of land ET throughout the study period; the average impacts of precipitation, potential evapotranspiration, and vegetation restoration on ET change were 61.5%, 11.5% and 26.9%, respectively. These results provide an improved understanding of the relationship between vegetation condition change and climate variation on terrestrial ET in the study area and can support future decision-making regarding water resource availability.
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Received: 03 September 2018
Published: 10 December 2019
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Corresponding Authors:
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HE Guohua, ZHAO Yong, WANG Jianhua, GAO Xuerui, HE Fan, LI Haihong, ZHAI Jiaqi, WANG Qingming, ZHU Yongnan. Attribution analysis based on Budyko hypothesis for land evapotranspiration change in the Loess Plateau, China. Journal of Arid Land, 2019, 11(6): 939-953.
URL:
http://jal.xjegi.com/10.1007/s40333-019-0107-5 OR http://jal.xjegi.com/Y2019/V11/I6/939
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