highly significantp < 0.001
In PD, the MNTD index showed a highly significant positive correlation with the MPD index ( p < 0.001), and both indices had no significant correlation with the PD index, the Shannon–Wiener index, and the Margalef index.
In PD, the MNTD index showed a highly significant positive correlation with the MPD index ( p < 0.001), and both indices had no significant correlation with the PD index, the Shannon–Wiener index, and the Margalef index.
It is worth noting that the Pielou evenness index showed a significant trend of first decreasing and then increasing with increasing longitude ( p < 0.01) (Figure 3c ).