第八届青年地学论坛

 China’s numerous cities are facing both quantity- and quality-induced water scarcity, which can be measured by the water footprint from a consumption (WF_cons) or production (WF_prod) perspective. Although WF_cons was widely assessed, the changes in WF_prod of China’s cities were still unclear. Taking 31 major cities as examples, this study revealed the dynamics of urban WF_prod in China from 2011 to 2016. First, the spatiotemporal patterns of WF_prod and water deficit were evaluated and then the main reasons for the WF_prod dynamics and its implications for urban sustainability were explored. A large-scale decrease in urban WF_prod in China was found, with the average WF_prod decreasing from 13.8 billion m³ to 10.4 billion m³ and the per capita WF_prod decreasing from 1618.6 m³/person to 1190.9 m³/person (i.e., falling by more than a quarter in just six years). Such shrinkage was particularly evident in drylands, eliminating the water deficit in Xi’an and Xining. The reduction in grey WF_prod caused by implementing water pollution prevention policies and other relevant measures played the most important role in the savings. In the future, the implementation of updated pollution discharge standards is projected to allow more cities to escape water deficits; however, the rapid growth of the domestic and ecological blue WF_prod caused by urbanization and urban greening would destabilize this prospect. Thus, attention should be given to both water pollution prevention and domestic and ecological blue WF_prod restriction to further alleviate urban water scarcity in China.
 

urban landscape sustainability; water security; water scarcity; water pollution; water demand