3.1 Variation in rhizosphere soil properties at different forest ages
During the restoration of R. pseudoacacia , rhizosphere soil properties typically changed along the chronosequence (Table S2). Across all samples, most soil properties (SOC, SOM, TN, AP, NO3--N, NH4+-N, MBC, MBN, DOC, and DON) increased significantly from RS15 to RS35. In contrast, SOC, SOM, and TN contents were significantly lower in RS45 than in RS35. Furthermore, soil pH values decreased significantly from RS15 to RS35, while there was no considerable change in soil pH values between RS45 and RS15.