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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (2): 223-233.DOI: 10.7522/j.issn.1000-694X.2022.00018

Previous Articles    

Temporal and spatial changes of vegetation coverage and water production in the Weihe River Basin from 2000 to 2020

Yaowen Zhang(), Bo Zhang(), Rongpeng Yao, Libing Wang   

  1. College of Geography and Environmental Science,Northwest Normal Uninersity,Lanzhou 730070,China
  • Received:2021-12-29 Revised:2022-03-02 Online:2022-03-20 Published:2022-03-30
  • Contact: Bo Zhang

Abstract:

As one of the earliest areas in the Loess Plateau to implement ecological management projects, the Weihe River Basin is of great significance to the Yellow River Basin and the Loess Plateau. Based on the InVEST water production model and Landsat remote sensing images, this paper analyzes the changes of vegetation coverage and responses of water production in the watershed. The research results show that the overall vegetation coverage in the Weihe River Basin showed a significant increase trend from 2000 to 2020. The spatial distribution of NDVI in the Weihe River Basin showed a decreasing-increasing-decreasing trend from the southeast to the northwest. The area of ??the extremely significant improvement area accounted for 69.2% of the entire watershed, and the vegetation coverage type had shifted to high vegetation coverage as a whole, and the ecological environment of the watershed gradually improved. The overall water production was on the rise. However, in the areas with gentle slopes and strong population activities, the water production was high. The water production in each season, except for summer, showed an overall increasing trend. Affected by ecological engineering, the water production in summer showed a trend of first increasing and then decreasing, and the water production in winter showed a trend of first decreasing and then increasing; The vegetation type is mostly forest land, and the area with large slope has a significant negative correlation between water production and vegetation coverage. With the increase of vegetation coverage, the water production showed an increasing trend. When the vegetation coverage reached the threshold, the water production of the watershed no longer increased, and even decreased.

Key words: Weihe River Basin, NDVI, InVEST model, water production, ecosystem services

CLC Number: