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Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (5): 318-327.DOI: 10.7522/j.issn.1000-694X.2025.00024

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Relationship between NDVI and precipitation in the Hexi Corridor desert area

Lingfei Zhong1(), Hu Liu2, Lihua Zhang1()   

  1. 1.College of Geography and Environment Science,Northwest Normal University,Lanzhou 730030,China
    2.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
  • Received:2024-11-23 Revised:2025-02-19 Online:2025-09-20 Published:2025-09-27
  • Contact: Lihua Zhang

Abstract:

In arid desert areas, some natural vegetation mainly depends on groundwater for survival, which is known as groundwater-dependent vegetation. Protecting groundwater-dependent vegetation is an important task in ecological construction in arid areas, and using remote sensing products to rapidly identify groundwater-dependent vegetation has important practical significance for ecological protection in arid areas. We selected six sample areas dependent on different sources of moisture in the Hexi Corridor, analysed the correlation between vegetation NDVI changes and precipitation from 2001 to 2020 in each sample area, and explored the feasibility of applying NDVI products to identify groundwater-dependent vegetation. The result shows that the average NDVI value of the six sample areas from 2001 to 2020 was between 0.11-0.29, and the coefficient of variation was between 0.07-0.59; the maximum value was between 0.20-0.32, and the minimum value was between 0.07-0.26. Pearson's correlation results showed that the correlation coefficients between the average NDVI and growing season precipitation in the six sampling areas ranged from 0.16 to 0.55, the correlation coefficients between the maximum NDVI and growing season precipitation ranged from 0.24 to 0.65, and the correlation coefficients between the minimum NDVI and growing season precipitation ranged from 0.10 to 0.30; the correlation coefficients between the variability of NDVI and the growing season precipitation ranged from 0.21 to 0.70. The correlation coefficients between NDVI variability and growing season precipitation ranged from 0.21 to 0.70. In general, the correlation of desert vegetation NDVI variability with growing season precipitation was greater than that with annual precipitation, and the correlation between groundwater-dependent vegetation NDVI and precipitation was smaller than that of precipitation-dependent vegetation; the correlation of NDVI growing season variability with growing season precipitation was higher than that with the correlation of the mean growing season NDVI with growing season precipitation. Therefore, the growing season NDVI variability can better infer the dependence of vegetation on groundwater through the dependence of vegetation on precipitation.

Key words: Hexi Corridor, precipitation, groundwater burial depth, NDVI, dependence of vegetation on groundwater

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