JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (8): 1337-1347.doi: 10.11849/zrzyxb.20160799

• Resource Ecology • Previous Articles     Next Articles

Spatio-temporal Variation of Water Supply Service in Bailong River Watershed Based on InVEST Model

XIE Yu-chu1, 2, GONG Jie2, QI Shan-shan2, WU Jing1, HU Bao-qing1   

  1. 1. a. Key Laboratory of Environment Change and Resources Use in Beibu Gulf (Ministry of Education), b. Key Laboratory of Earth Surface Process and Intelligent Simulation, Guangxi Teachers Education University, Nanning 530001, China;
    2. Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
  • Received:2016-07-25 Revised:2016-11-25 Online:2017-08-20 Published:2017-08-20
  • Supported by:
    Scientific research fund for Guangxi Teachers Education University, No. 0819-2016L12National Natural Science Foundation of China, No. 41271199Opening Fund of Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Ministry of Education (Guangxi Teachers Education University), No. 2015GXESPXT03.

Abstract: Water supply service is not only an essential ecosystem service for supporting human well-being, but also a hot topic in ecology and hydrology. The quantitative assessment and mapping of spatiotemporal variation of water supply service have important significance for water conservation planning, water management and establishment of ecological compensation mechanism in the water source areas. Bailong River Watershed (BRW), a vital ecological function region of water supply and conservation in the upper Yangtze River, locates in the transitional ecotone of the Loess Plateau, Qinba Mountains and Tibet Plateau. Based on InVEST model simulations, RS, GIS spatial analysis, field observation and survey, BRW was selected as a case to estimate water supply service and analyze the impact of vegetation types, elevation, slope, slope direction on the spatiotemporal pattern of water supply service. Moreover, the reference factors and data, such as land use, meteorology (eg. precipitation, evapotranspiration), soil and the DEM data, were preprocessed and calculated. The results showed that the average annual water yield and total water yield in the BRW were approximately 388 mm and 9.0 billion m3. There was a significant spatial heterogeneity of water supply in the basin. The southern and southeast areas of the BRW had higher volume of water supply per unit area, especially in the forest areas and nature reserves, such as Dieshan mountain forest region, Baishuijiang National Nature Reserve. Low water yield area mainly distributed in central valleys of BRW between Zhouqu and Hanwang town, which were not only dry-hot valleys but also centralized agricultural and urban areas. The comparison of water conservation capacity between different types of vegetation landscape indicated that the spruce and fir, quercus, broadleafed forest, mixed coniferous and broad-leafed forest, evergreen coniferous forest and other high-forest had high water yield capacity in the BRW. The areas with the highest water yield distributed from 1 500 to 3 500 m and from 15° to 40°. Moreover, the water yield capacity was higher on shady slope than on sunny slope.

Key words: Bailong River Watershed, ecosystem service, InVEST model, water supply

CLC Number: 

  • X171