Water consumption, efficiency and future extremum of accompanying China's social commodity consumption
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Abstract:
To objectively evaluate the real water consumption and water efficiency link, the water consumption accompanying social commodity consumption was studied based on virtual water analysis. Based on the national and provincial water resource input-output tables. A virtual water flux and comprehensive water use efficiency evaluation model was built to evaluate the virtual water flux. Water consumption accompanying social commodity consumption and comprehensive water use efficiency of China′s provinces in 2007, 2012, and 2017, and the extreme value of water consumption accompanying social commodity consumption in the future was predicted.The results showed that the domestic virtual water input area converged to high-income areas, and the virtual water output area converged to water resources-intensive product production areas. Considering the virtual water circulation, the comprehensive water use efficiency of each province had the same characteristics, and the per capita comprehensive water consumption had a good logarithmic relationship with the level of economic development. The more developed the economy and the higher the living standard of residents, the higher the per capita comprehensive water consumption. Due to changes in the structure of international trade commodities, China′s economic and social water usage was higher than that of water consumption accompanying social commodity consumption before 2012, and then the latter exceeded the former. It is expected that China′s water consumption accompanying social commodity consumption will reach the extreme value of 6 907 billion cubic meters in 2035-2040, 427 billion cubic meters higher than the water usage of economic and social.Water usage of economic and social and water consumption accompanying social commodity consumption, respectively, reflected the scale of water use at the production end and the consumption end. With the improvement of economic and social living standards and the transformation of trade structure, China′s water consumption accompanying social commodity consumption has exceeded the economic and social water usage, and will still show an increasing trend in the future. The difference between the two was mainly solved through virtual water. It is necessary to reasonably optimize the commodity import and export structure to avoid economic and social risks caused by bulk imports.
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