Abstract:
Objective We explore the response mechanism of soil microbial community structure dynamics to the interference of stand structure adjustment in order to evaluate the impact of management treatment on the ecosystem of Pinus tabulaeformis Plantation.
MethodsBased on Pinus tabulaeformis plantations in Zhongtiao Mountain, Shanxi Province, we explored the group composition and diversity of soil microorganisms 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 environmental factors.
ResultsThe 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 significantly. 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 Mortierella. 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 community structure.
Conclusion The treated Pinus tabulaeformis plantation is still in the disturbance recovery period. The microbial community structure is similar to that of the control treatment, but is more abundant in Pinus tabulaeformis plantation after stand structure adjustment, which improves the proportion of nitrogen fixing bacteria in the soil. The increase in Proteobacteria and Basidiomycota leads to soil microorganisms shift towards organic matter decomposition.
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