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Journal of Arid Land

Article Title

Attribution analysis based on Budyko hypothesis for land evapotranspiration change in the Loess Plateau, China

Authors

Guohua HE, 1 State 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;
Yong ZHAO, 1 State 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;Follow
Jianhua WANG, 1 State 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;
Xuerui GAO, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China
Fan HE, 1 State 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;
Haihong LI, 1 State 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;
Jiaqi ZHAI, 1 State 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;
Qingming WANG, 1 State 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;
Yongnan ZHU, 1 State 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;

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 1982 to 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.

Keywords

climate change; vegetation; evapotranspiration; control factor; arid region

First Page

935

Last Page

953

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