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Arid Land Geography ›› 2024, Vol. 47 ›› Issue (9): 1518-1529.doi: 10.12118/j.issn.1000-6060.2023.595

• Climatology and Hydrology • Previous Articles     Next Articles

Spatiotemporal variation of water conservation function evaluation based on InVEST model: A case of Lanzhou City

SHI Ying1(), BIE Qiang1,2,3(), SU Xiaojie1, LI Xinzhang1   

  1. 1. School of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
    2. National and Local Joint Engineering Research Center for Application of Geographic National Conditions Monitoring Technology, Lanzhou 730070, Gansu, China
    3. Gansu Provincial Engineering Laboratory of Geographic National Conditions Monitoring, Lanzhou 730070, Gansu, China
  • Received:2023-10-23 Revised:2024-01-03 Online:2024-09-25 Published:2024-09-24
  • Contact: BIE Qiang E-mail:11220886@stu.lzjtu.edu.cn;bieq@lzjtu.edu.cn

Abstract:

Under the background of “four waters and four determinations”, scientific and quantitative assessment of water conservation capacity is the basis for ensuring high-quality social and economic development and effective protection of the ecological environment. As an important part of the “double evaluation”, the evaluation of the importance of ecological protection plays a guiding role in the evaluation of agricultural production and urban construction. Based on the InVEST water yield module, the water conservation volume was obtained by using the terrain index, soil saturation water conductivity and flow velocity coefficient to obtain the water conservation volume, and the temporal and spatial evolution of water conservation in Lanzhou City of Gansu Province, China from 2000 to 2020 was quantitatively evaluated, and the impact of land use type change on it was discussed, and the importance level of water conservation function was divided. The results showed that: (1) From 2000 to 2020, except for the decrease of farmland area, the area of other land use types increased, and the increase of grassland was the most significant. (2) The spatial distribution of water conservation in Lanzhou City was “high-low distribution”, and the average unit water conservation was 15.42 mm, and the total water conservation volume was 2.03×108 m3. From 2000 to 2020, the average unit water conservation and total amount in Lanzhou increased, and the increase rate gradually increased. (3) The total water conservation of different land use types in Lanzhou is as follows: grassland>farmland>woodland>impervious surface>bare land>shrubs. Among them, the average unit water conservation capacity of forest land was the largest, while the total water conservation of grassland was the largest. (4) From 2000 to 2020, the area of the generally important and relatively important areas of water conservation function in Lanzhou decreased, and the area of moderately important, highly important and extremely important areas increased. The evaluation and importance classification of water conservation functions can provide scientific reference and guidance for consolidating the existing achievements of returning farmland to forest and grassland, promoting the construction of ecological civilization, and promoting regional economic development in China’s arid areas.

Key words: Lanzhou City, InVEST model, water conservation, land use change