In deciduous broad-leaved forests, the Shannon–Wiener index showed a significant negative correlation ( p < 0.05) with available potassium (AP), while the Simpson index and Pielou index showed a highly significant negative correlation ( p < 0.01) with available potassium (AP).
In the mixed coniferous and broad-leaved forest, NRI and NTI showed a trend from less than 0 to greater than 0, indicating that there are both parts of the community structure that are higher than or lower than the random state.
This indicates that climate change is causing significant changes in the suitable habitats of some species—the distribution range of some species is expanding, while the suitable habitats of more species are showing a decreasing trend.