highly significantP < 0.001
The result revealed a significant IBD effect ( P < 0.05) in the XJ–KZ and XJ–MGL regions ( r = 0.3822, P = 0.0249 and r = 0.4786, P = 0.0196, respectively), especially a highly significant relevance at the species level ( r = 0.6024, P < 0.001, Table 4 ).