Dynamics of Soil Microbial Groups in Pinus tabulaeformis Plantation in Response to Stand Structure Adjustment
[Objective]We explore the response mechanism of soil microbial community structure dynam-ics to the interference of stand structure adjustment in order to evaluate the impact of management treat-ment on the ecosystem of Pinus tabulaeformis Plantation.[Methods]Based on Pinus tabulaeformis plant-ations in Zhongtiao Mountain,Shanxi Province,we explored the group composition and diversity of soil mi-croorganisms under the stand structure adjustment through the high-throughput sequencing technology to analyze the diversity、composition and structure of soil microbial community and its correlation with envir-onmental factors.[Results]The results showed that stand structure adjustment could reduce the pH value of soil and the content of soil nutrients.The dominant flora of soil microorganisms did not change signific-antly.Proteus,actinomycetes and Acidobacteria were the dominant bacterial groups in the soil of Pinus tabulaeformis plantation,while the dominant fungal groups were Ascomycetes,Basidiomycetes and Mor-tierella.The richness of soil microorganisms in Pinus tabulaeformis plantation increased significantly after adjustment,but the difference was not significant in diversity.RDA analysis showed that pH,total nitrogen,soil organic matter and available nitrogen were the main factors driving changes in soil microbial com-munity structure.[Conclusion]The treated Pinus tabulaeformis plantation is still in the disturbance recov-ery period.The microbial community structure is similar to that of the control treatment,but is more abund-ant in Pinus tabulaeformis plantation after stand structure adjustment,which improves the proportion of ni-trogen fixing bacteria in the soil.The increase in Proteobacteria and Basidiomycota leads to soil microor-ganisms shift towards organic matter decomposition.
P.tabuliformis plantationstructural adjustmenttarget tree managementsoil microorganismsoil microbial community structure
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