Plantation rhizosphere soil microbes promote soil‒plant phosphorus feedback on the Tibetan Plateau

创建时间:2023-12-18 15:49



Mixed effects model, structural equation model, multivariate analysis




Plantation rhizosphere soil microbes promote soilplant phosphorus feedback on the Tibetan Plateau


Plant and Soil, 13 February 2023





Background and aims

Afforestation can alter belowground microbial diversity and affect soilplant feedback, which is crucial for understanding nutrient cycles and ecosystem productivity. Most studies have focused on the carbon and nitrogen cycles in forest ecosystems; however, there are few studies on the effect of afforestation in soil microbial diversity on phosphorus (P) nutrients. In this study, we explored the effect of soil microbial communities on soilplant P feedback under long-term afforestation.



Typical poplar plantations were selected from the Lhasa River Basin. We assessed the P content, activity of extracellular enzyme related to P acquisition, rhizosphere soil microbes, and mechanism of microbial community.



Increased bacterial richness and evenness were beneficial to soil and plant P nutrition; however, the community differentiation of bacteria and fungi had no positive effect on the P content. Ecological stochasticity drove for the assembly of the rhizosphere soil microbial community after afforestation on the Tibetan Plateau. Homogenizing dispersal dominated bacterial and fungal assemblies. Ecological drift was another stochastic process that affected the microbial assembly.



Bacterial richness and evenness had positive effects on soilplant P feedback, whereas microbial differentiation did not. Homogenizing dispersal and ecological drift are intrinsic factors that regulate the effects of microbial community diversity on soilplant P feedback processes.


This study provides the evidence on the intrinsic mechanism of belowground microbial diversity influencing soilplant P feedback. It also provides new insights into the selection of plantation species on the Tibetan Plateau from the perspective of enhancement of P nutrition by microbes.