Spatiotemporal variation and GeoDetector analysis of NDVI at the northern foothills of the Yinshan Mountains in Inner Mongolia over the past 40 years.

High-volatility and extremely high-volatility vegetation accounted for 17.87 and 5.15 % of the total study area, respectively, and the overall NDVI changes showed a trend of low and medium volatility, with great variability across the study area. 3.4.

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This is calculated as follows: S lope N D V I = M e d i a n ( N D V I j − N D V I i j − i ) In the formula, Slope NDVI represents the trend of NDVI, NDVI j and NDVI i are the NDVI values in the jth and ith years of the image element, respectively, when Slope NDVI > 0, it indicates that the NDVI shows an increasing trend, and vice versa shows a decreasing trend.

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