Overall, the mean value of the slope index was 0.004, and the vegetation cover in the area showed a significant trend of improvement during 2000–2019 (Fig. 5 a).
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Analysis of spatial and temporal changes in vegetation cover and its drivers in the Aksu River Basin, China.
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The sentences
The annual rate of decrease in the low vegetation zone was − 0.0078 a −1 , with a decreasing trend in the zone’s share of the whole study area; the rate of increase in the medium–low vegetation zone was 0.0035 a −1 , and increasing trends were also observed in the medium, medium–high, and high vegetation zones.
The NDVI of 73.76% of the vegetation areas in the zone showed an increasing trend.