Fig. 2

Pairwise Pearson’s correlation analyses between each of the two soil characteristics. Red and blue indicate positive and negative correlation, respectively. The figures demonstrate the scale of correlation. Lat Latitude, Lng Longitude, SOC Soil Organic Carbon, AN Available N, AP Available P; AK Available K, MMB Molecular Microbial Biomass. Num_OTUs are the numbers of bacterial OUTs, respectively. Simpson, Shannon, Chao1, and ACE are the α-diversity index. *Significant level (*P < 0.05; **P < 0.01; ***P < 0.001)