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Regional comparison of water footprint in China based on the multi-regional input-output analysis: in the analytical level of economic regions

WU Zhaodan;WU Zhaolei;ZHANG Changzheng;School of Business Administration,Hohai University;Jiangsu Provincial Collaborative Innovation Center of World Water Valley and Water Ecological Civilization;Center of Africa Studies with One Belt One Road,Hohai University;School of Electric Power,North China University of Water Resources and Electric Power;School of Business,Hohai University;  
Based on the analytical level of economic regions,applying the multi-regional input-output analysis,Theil index spatial difference decomposition method and pseudo-Gini coefficient difference causes decomposition method,the water footprint similarities,differences and the difference genesis are unearthed in the scale of both the inter-economic region and the inter-province in each economic regions,from three aspects of total amount,department structure and relevant index,accompanied by the regions where water use is necessary to adjust in the water security system with Chinese characteristics. The results show that:( 1) The contribution of inter-economic region divergence and the inter-province difference in each economic region are almost the same to the overall spatial variation of water footprint in China.( 2) The water footprint in the northwest,middle and southwest regions are higher than that in any other economic regions. Both the inter-region divergence of per capita water footprint in the agriculture,forestry,animal husbandry and fishery and that of the population are the main cause of water footprint difference among economic regions. The water footprint of primary industry in the north coast region and northwest region and that of food manufacturing and tobacco processing industries in other regions are,respectively,the main component of the water footprint in the corresponding region.( 3) There are similarities and differences among the most contributors of the inter-province water footprint difference in each economic region. While most contributors of them come from the inter-province divergence of the corresponding department per capita water footprint. Some similarity and differences are also shown in the structures of the departments in provincial water footprint.( 4) It is greatly necessary to adjust water use in northeast region( especially Heilongjiang),Beijing-Tianjin region( especially Tianjin),Shandong,Shanghai,Hainan,Ningxia,Chongqing and Shanxi,while it is less necessary to adjust water use in the northern coastal region( except Shandong),the eastern costal region( except Shanghai),the northwest region( except Ningxia),followed by Yunnan and Jiangxi.
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