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[1]SUN Guikai,HUANG Rui,WANG Guoshuai,et al.Spatiotemporal Variation of Water Use Efficiency and Its Influencing Factors in Xijiang River Basin from 2001 to 2018[J].Research of Soil and Water Conservation,2023,30(03):327-335.[doi:10.13869/j.cnki.rswc.2023.03.042]

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Spatiotemporal Variation of Water Use Efficiency and Its Influencing Factors in Xijiang River Basin from 2001 to 2018

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 327-335 Column: Public date: 2023-04-10

Title:: Spatiotemporal Variation of Water Use Efficiency and Its Influencing Factors in Xijiang River Basin from 2001 to 2018

Author(s):: SUN Guikai^1,2,3,4, HUANG Rui^1,2,3,4, WANG Guoshuai^1,2,3,4, WANG Xicai^1,2,3,4, MA Long^1,2,3,4, WANG Lei^1,2,3,4, MO Chongxun^1,2,3,4; (1.College of Civil Engineering, Guangxi University, Nanning 530004, China; 2.Key Laboratory of Disaster Prevention and Structural Safety, Ministry of Education, Nanning 530004, China; 3.Engineering Research Center of Water Safety and Intelligent Regulation in Karst Areas of Guangxi Zhuang Autonomous Region, Guangxi University, Nanning 530004, China; 4.Guangxi Key Laboratory of Disaster Prevention, Mitigation and Engineering Safety, Nanning 530004, China)

Keywords:: GPP; water use efficiency; spatiotemporal changes; influencing factors; Xijiang River Basin

CLC:: TV11; P343

DOI:: 10.13869/j.cnki.rswc.2023.03.042

Abstract:: [Objective]Exploring the interrelationship between the carbon and water cycles in watersheds in the context of global climate change has significant implications for the scientific allocation of water resources in watersheds. [Methods] Xijiang River Basin was taken as an example, the water use efficiency(WUE)of regional ecosystem vegetation was quantified based on gross primary productivity(GPP)and evapotranspiration(ET)data in GLASS products from 2001 to 2018, then the spatial and temporal evolution characteristics of WUE and its influencing factors were studied by using the methods of trend analysis and partial correlation analysis. [Results] The WUE of vegetation in Xijiang River Basin generally showed an increasing trend from 2001 to 2018. The WUE of forest land grew at the fastest rate, followed by grassland and the slowest by cropland. In terms of spatial distribution, WUE values gradually increased from cultivated land in central Guangxi to the surrounding areas, and low WUE values also sporadically distributed in the tablelands and hilly areas in the eastern of Yunnan. WUE values in 15.23% and 12.12% of the area of Xijiang River Basin were significantly and positively correlated with temperature and precipitation, respectively. WUE in 11.54% of the area of Xijiang River Basin was significantly and negatively correlated with solar radiation. NDVI was significantly and positively correlated with WUE; WUE with the rise of the altitude showed a rising-flat-rising trend, and at altitude of around 2 100 m, there is a significant fluctuation of WUE. [Conclusion] The above results indicate that climate factors, NDVI, altitude and human activities all affect the water use efficiency of Xijiang River Basin to different degrees. This study can provide reference for the management of stone desertification in the southwest karst region of China and the construction of ecological protection forest system in the basin.

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Last Update: 2023-04-10