highly significantp < 0.05
The percentage of areas showing significant and highly significant positive correlations (13.89%) is also higher than that of areas with a negative correlation (5.03%) at p < 0.05.
The percentage of areas showing significant and highly significant positive correlations (13.89%) is also higher than that of areas with a negative correlation (5.03%) at p < 0.05.
In contrast, a decreasing trend was observed in southern Xinjiang, northern Qinghai and Gansu, and western Inner Mongolia.
This indicates that the vegetation growth shows a favorable trend. 3.
Figure 3 illustrates that, in general, vegetation cover in northwest China has experienced a positive trend over the years.
Figure 2 c shows that during 1982–2000, NDVI trends were not significant, with only 20.63% of the regions exhibiting an increasing trend, and 78.36% showing no significant change.
[ 26 ] analyzed the process of vegetation restoration in the eastern margin ecotone of the Qinghai–Tibet Plateau (EMEQTP) from 2001 to 2019 and showed that the NPP under a natural restoration mode had the highest increase, at 20.1%, and its spatial change showed an overall trend of restoration.