Characteristics of Soil Microbial Diversity at Different Restoration Years As shown in Table 1 , the bacterial α-diversity indices (Chao1 and Shannon) in rhizosphere soil exhibited an initial increase followed by a decreasing trend with extended restoration duration.
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Rhizosphere and Non-Rhizosphere Soil Microbial Communities in Alpine Desertified Grassland Affected by Vegetation Restoration.
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The relative abundance of Actinobacteria exhibited highly significant positive correlations with carbon, nitrogen, phosphorus, and enzyme activity indicators, indicating that Salix cupularis restoration promoted improvements in soil physicochemical properties and nutrient accumulation, thereby enhancing bacterial community diversity and increasing Actinobacteria abundance.
The results demonstrated that in the rhizosphere, the relative abundance of Actinobacteria showed an increasing trend with restoration duration, reaching 30.82%, 32.87%, 33.70%, and 36.59% at 4, 8, 16, and 24 years, respectively, representing increases of 3.47%, 5.52%, 6.36%, and 9.25% compared to CK ( p < 0.05).