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Scientia Silvae Sinicae ›› 2021, Vol. 57 ›› Issue (7): 101-110.doi: 10.11707/j.1001-7488.20210711

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Responses of Soil Bacterial Community Structure and Phenotype to Soil Heterogeneity in Larix principis-rupprechtii Forest

Pengyu Zhao1,Xue Bai1,Pingmei Yan1,Xiaodong Zhao1,Xiaoying Wu1,Baofeng Chai2,*   

  1. 1. Department of Biology, Taiyuan Normal University Jinzhong 030619
    2. Institute of Loess Plateau, Shanxi University Taiyuan 030006
  • Received:2020-09-17 Online:2021-07-25 Published:2021-09-02
  • Contact: Baofeng Chai

Abstract:

Objective: This study investigated the phenotypic plasticity of soil microbial communities in Larix principis-rupprechtii forests in Shanxi Province to reveal the relationship between the structure and phenotype of the microbial community,and the response to environmental heterogeneity,so as to provide a theoretical basis for explaining the mechanism of species coexistence. Method: In Yedoufeng of Wutai Mountain,Pangquangou Nature Reserve of Guandi Mountain,and Luya Mountain,8,10,and 5 samples in the pure forest of Larix principis-rupprechtii were selected along the altitude gradient,respectively. The mixed soil samples of 0-10 cm soil layer in the forests were collected. The composition and structure of soil microbial community were determined by high-throughput sequencing. The change of soil microbial community phenotype was predicted by BugBase analysis. Through statistical analysis of data,the response mechanism of community structure and phenotype to environmental heterogeneity was revealed. Result: The results of this study showed that the large elevation gradients and micro-habitat differences in the Yedoufeng Mountain,Guandi Mountain Pangquangou Nature Reserve,and Luya Mountain led to significant differences in soil chemical properties among the sites. The results of high-throughput sequencing showed that the relative abundance of Proteobacteria was the highest,followed by Acidobacteria,Actinobacteria and Chloroflexi Bacteria. Phenotypic analysis of the floar showed that phenotypes related to oxygen demand (aerobic,anaerobic),biofilm formation and Mobile Element Containing were significantly different in different study sites. In addition,the structure and phenotype of bacterial communities had potential environmental adaptation consistency and similar spatial distribution patterns. Soil pH and organic carbon,total carbon and total nitrogen content had significant effects on soil bacterial community structure and phenotype. Conclusion: The structure and phenotype of the forest microbial community are significantly affected by the physicochemical properties of the soil,and there are great differences among different research sites,but the structure and phenotype of the soil microbial community are consistent in their environmental adaptability,showing a synergistic change law,so that the overall shows a similar biogeographic distribution pattern. Microorganisms can adjust their phenotypes to enhance their adaptability to environmental heterogeneity.

Key words: microorganism, community structure, phenotype, environmental factors, response

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