Response of Soil Microbial Communities to Karst Desertification in Soil and Water Conservation Agroforestry Systems.

From the perspective of community composition, OTU-level community structure exhibited highly significant correlations with SMC, FC, pH, and Total_K ( p < 0.01), and significant correlations with Clay and SOC ( Table S3 ).

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According to Figure 3 , Chao indices for BJ, QZ, and HJ were 7136, 8192.07, and 7139.14, respectively, and Shannon indices were 11.78, 11.96, and 11.67, indicating that soil bacterial richness and evenness both showed a trend of first increasing then decreasing with worsening KD.

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Among the assigned functions, chemoheterotrophy and aerobic chemoheterotrophy dominated across all sites and showed an increasing trend with increasing KD severity, indicating that under MHKD conditions, bacterial metabolic activities are increasingly focused on the decomposition and utilization of limited organic carbon resources.

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