Analysis of vegetation ecological water use growth in karst rocky desertification area under the background of rapid economic growth
CHEN Ke1, YANG Shengtian2, ZHANG Liping3, GUAN Yabing2, WANG Zhaoduo1, ZHANG Xitong1
1. College of Tourism Culture and Geography, Huanggang Normal University, 438000, Huanggang, Hubei, China; 2. State Key Laboratory of Remote Sensing Science, Beijing Normal University, 100875, Beijing, China; 3. School of Water Resources and Hydropower Engineering, Wuhan University, 430072, Wuhan, China
Abstract：[Background] Due to the special geological structure and the destruction of vegetation in karst rocky desertification area, the rainfall quickly leaks and is lost. With the rapid economic development, there are the dual pressures of ensuring water for production and domestic use as well as ecological water for vegetation. Guiyang city, the capital of Guizhou province, has developed rapidly in recent years and is located in the center of karst rocky desertification in southwest China, was selected as the study area to analyze the growth potential of vegetation ecological water use.[Methods] With a combination of vertical comparison and horizontal comparison, the change trends of production water usage, domestic water usage and ecological water usage in the study area from 2003 to 2013 were compared, and the total water resources of the study area were combined to analyze the growth potential of ecological water consumption. In addition, remote sensing technology was also combined to reveal the potential growth area of vegetation ecological water usage.[Results] 1) Guiyang is relatively rich in water resources, but the groundwater that was difficult to use directly accounted for up to 30.12% of local total water resources in every year. 2) Relative to annual change in precipitation, the production and domestic water usage were relatively stable, and maintained at around 1.023×109 m3 every year since 2008. 3) Compared with production and domestic water usage, Guiyang's ecological water consumption showed a slow growth trend, and it would be a substantial increase in the future. 4) The multi-year average green water in Guiyang city accounted for 48.71% of the precipitation, which was 16 percentage points lower than the global average(65%), and there will be growth potential.[Conculsions] For karst rocky desertification areas with relatively abundant water resources but severe vegetation destruction, increasing ecological water usage has great potential, and it is a more feasible way to increase ecological water usage by restoring vegetation. The above analysis presents certain reference significance for the study of ecological water usage and reduction of soil erosion in similar areas.
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CHEN Ke, YANG Shengtian, ZHANG Liping, GUAN Yabing, WANG Zhaoduo, ZHANG Xitong. Analysis of vegetation ecological water use growth in karst rocky desertification area under the background of rapid economic growth. SSWC, 2021, 19(5): 72-81.
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2021, Vol. 19 
