The results show that there are obvious fluctuations of NDVI accumulation value series in different growing seasons in Yimeng mountain area. Among them, the vegetation dynamics in the Mengshan area showed an overall upward trend, especially after 1990s; the vegetation dynamics in the Tashan area showed no obvious trend change in general, but the volatility was large; the NDVI accumulation value in the growth season of Yishan area was 7.359, lower than that in the Mengshan and Tashan areas, and the vegetation dynamics had no obvious trend, but the volatility was obvious.<br>
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