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| Virtual water flow and its impact on agricultural water utilization among provinces of China |
| GUO Xiangping1,2, YU Tao2, WU Mengyang2, GAO Shuang2, CAO Xinchun1,2* |
| 1.Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Ministry of Education, Hohai University, Nanjing, Jiangsu 210098, China; 2.College of Agricultural Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
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Abstract Based on simulating the virtual water flow among provinces, the effect of virtual water flow on agricultural water use in China was evaluated from the perspectives of water-saving effect and regional water use efficiency. The results show that the virtual water of food flows from north to south on the whole. Heilongjiang and Jilin account for 69.1% of the tatal output, Guangdong, Zhejiang, Fujian, and Shanghai account for 56.2% of the total input. Meanwhile, the virtual water flow among provinces has saved 199.4 millions m3 of water resources in China, the WFP and WUP in the whole input regions and the WFP in the main input regions are increased, the WUP and WFP in all output regions except Heilongjiang and Jilin are descended. All the provinces, cities and autonomous regions should formulate strategies for the effective utilization and management of water resources based on their respective local condition and goal orientation, the main grain-producing areas in Northeast China should develop regional water-saving agriculture and improve the efficiency of agriculture water use.
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Received: 11 April 2018
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