title: The rhizospheric microbial community structure and diversity of deciduous and evergreen forests in Taihu Lake area, China.
abstract: Soil bacteria are important drivers of biogeochemical cycles and participate in many nutrient transformations in the soil. Meanwhile, bacterial diversity and community composition are related to soil physic-chemical properties and vegetation factors. However, how the soil and vegetation factors affect the diversity and community composition of bacteria is poorly understood, especially for bacteria associated with evergreen and deciduous trees in subtropical forest ecosystems. In the present paper, the microbial communities of rhizospheric soils associated with different types of trees were analyzed by Illumina MiSeq sequencing the V3-V4 region of the 16S rRNA gene. A total of 121,219 effective 16S rRNA gene sequences were obtained, which were classified into 29 bacterial phyla and 2 archaeal phyla. The dominant phyla across all samples (>5% of good-quality sequences in each sample) were Proteobacteria, Acidobacteria, Firmicutes and Bacteroidetes. The bacterial community composition and diversity were largely affected by both soil pH and tree species. The soil pH was the key factor influencing bacterial diversity, with lower pH associated with less diverse communities. Meanwhile, the contents of NO3- were higher in evergreen tree soils than those associated with deciduous trees, while less NH4+ than those associated with deciduous trees, leading to a lower pH and indirectly influencing the diversity and composition of the bacteria. The co-occurrence patterns were assessed by network analysis. A total of 415 pairs of significant and robust correlations (co-occurrence and negative) were identified from 89 genera. Sixteen hubs of co-occurrence patterns, mainly under the phyla Acidobacteria, Proteobacteria, Firmicutes and Bacteroidetes, may play important roles in sustaining the stability of the rhizospheric microbial communities. In general, our results suggested that local environmental conditions and soil pH were important in shaping the bacterial community of the Taihu Lake zone in east China.
authors.affiliation: The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China.|The Key Laboratory of Biotechnology for Medicinal Plant of Jiangsu Province, Jiangsu Normal University, Xuzhou, Jiangsu, China.
authors.forename: Zhiwen
authors.identifier: http://orcid.org/0000-0002-2632-1676
authors.initials: Z
authors.lastname: Wei
authors.affiliation: School of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan, China.
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Hu
authors.affiliation: The Bioscience and Engineering College, Jiangxi Agriculture University, Nanchang, Jiangxi, China.
authors.forename: Xunhang
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Marine and Biological Engineering, Yancheng Teachers University, Yancheng, Jiangsu China.
authors.forename: Yanzhou
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Wuxi Plum Garden and Hengshan Scenic Area, Wuxi, Jiangsu, China.
authors.forename: Leichun
authors.initials: L
authors.lastname: Jiang
authors.affiliation: The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China.
authors.forename: Zhengbing
authors.initials: Z
authors.lastname: Guan
authors.affiliation: The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Cai
authors.affiliation: The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China.
authors.forename: Xiangru
authors.initials: X
authors.lastname: Liao
mesh_terms: D001419:Bacteria / Q000235:genetics; D044822:Biodiversity; D002681:China; D017753:Ecosystem; D065928:Forests; D020411:Oligonucleotide Array Sequence Analysis; D018517:Plant Roots / Q000382:microbiology; D058441:Rhizosphere; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology