4) Comparison of the three subregions
The most active period of vegetation dynamics in the DSR was 2010–2015, with 9.58% of the statistically significant area changes in this region. The most active period of vegetation dynamics in the GSR and FSR was 2000–2005, which accounted for 9.33% and 18.78% of significantly changed areas, respectively, of the total areas of each subregion.
The overall trend across the three subregions was of vegetation recovery. The ranking of areas with significant restoration was: FSR (51.52%) > GSR (31.88%) > DSR (25.73%); and the ranking of areas with significant degradation was: FSR (2.57%) > DSR (0.53%) > GSR (0.33%). This shows that the FSR is the subregion with the most fluctuations in vegetation change on the MP, with the highest proportion of the area experiencing significant recovery and degradation. The GSR and DSR remained relatively stable, showing an overall improving trend. On the whole, the improvement indicated by the NDVI occurred mostly in the south and east of the study area.