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| DOI：10.13522/j.cnki.ggps.2021071 |
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| Spatiotemporal Variation of Water Use Efficiency and Its Drivers in South China |
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LIU Wenyu, CHEN Xiaohong
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1. Sun Yet-sen University, Zhuhai 519082, China;
2. Center for water resources and environment, Sun Yet-sen University, Guangzhou 510275, China
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| Abstract: |
| 【Background and objective】Spatiotemporal variation in water use efficiency and its underlying drivers are important factors in ecosystem management. South China is relatively abundant in water resources and saving water has not yet received as much attention as in other parts of the country. However, seasonal water shortage does occur and it is hence imperative to improve its water use efficiency. The purpose of this paper is to analyze the spatiotemporal variation of water use efficiency in this region.【Method】A comprehensive index system for evaluating water use efficiency was constructed based on living standards, agriculture, industry, ecology and economy in each province in southern China. The water use efficiency and its temporal change from 2000 to 2018 in each province was evaluated based on administrative region. The provincial variation of each index was analyzed using the Thiel coefficient, and its drivers were analyzed using the grey correlation method.【Result】Among the four provinces we analyzed, Fujian province was most effective in water use during this period, far ahead of Hainan and Guangdong provinces, while Guangxi autonomous region was the worst. The difference in water consumption per 10 000 yuan GDP and 10 000 yuan industrial-added value was the greatest between the four studied provinces. In contrast, the difference in irrigation water use efficiency and water consumption per capita was the smallest. Water use efficiency in the four provinces was mostly affected by water consumption and drainage, in addition to the economy and total water resource availability.【Conclusion】Water use efficiency in south China has been in steady increase. Overall, water use efficiency decreased from the southeast to northwest, and was higher in the highly industrialized province such as Fujian and Guangdong provinces. In addition to water-related factors, variation in water use efficiency was also affected by economic development and water resource availability. |
| Key words: Southern China; water use efficiency; TOPSIS analysis; information weight; Thiel coefficient; grey correlation method |
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