Spatial patterns of dominant bacterial community components and their influential factors in the southern Qinling Mountains, China

Yonghua Zhao; Manya Luo; Yujie Zhou; Xia Jia; Shuaizhi Kang; Shuyuan Yang; Qi Mu

doi:10.3389/fmicb.2022.1024236

Spatial patterns of dominant bacterial community components and their influential factors in the southern Qinling Mountains, China

Front Microbiol. 2022 Dec 23:13:1024236. doi: 10.3389/fmicb.2022.1024236. eCollection 2022.

Authors

Yonghua Zhao¹, Manya Luo¹, Yujie Zhou¹, Xia Jia¹, Shuaizhi Kang¹, Shuyuan Yang¹, Qi Mu¹

Affiliation

¹ Key Laboratory of Degraded and Unused Land Consolidation Engineering of the Ministry of Natural Resources, Shaanxi Key Laboratory of Land Consolidation, School of Land Engineering, School of Water and Environment, Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Chang'an University, Xi'an, China.

Abstract

Introduction: Soil bacteria not only maintain the biodiversity of forest ecosystems but also affect soil nutrient cycling and ecosystem function. Nonetheless, the spatial pattern and patchy distribution of dominant bacterial community components in soil are still rarely explored.

Method: The spatial pattern and distribution of the dominant bacterial community components and their influential factors were investigated using traditional statistics, geostatistics, and kriging spatial interpolation methods in the Huoditang region of the Qinling Mountains, China.

Results: The dominant bacterial phyla were Proteobacteria, Acidobacteria, Chloroflexi, Rokubacteria, Actinobacteria, and Verrucomicrobia in this region. Among the bacterial phyla, Proteobacteria occupied an area of 2.56 km² (the greatest) in the highest patch category, followed by Planctomycetes. Moreover, among the lowest patch category, Firmicutes occupied the lowest area (11.93 km²). The results of kriging maps showed that the dominant bacterial group presented "peak," "bimodal," and "multimodal" distributions in Huoditang. Proteobacteria, Acidobacteria, Chloroflexi, Gemmatimonadetes, Nitrospirae, and ASV (amplicon sequence variants) had significant spatial autocorrelation (< 0.68 km). Variance partitioning analysis confirmed that soil nutrients (36.5%) were the significant driving factors shaping the bacterial community structure, followed by environmental factors (28.2%) and topographic factors (7.8%). Furthermore, pH (9.1%), soil organic carbon (SOC, 6.6%), available phosphorus (AP, 4.7%), and elevation (3.9%) were the most important driving factors for the spatial distribution of bacterial community groups in the Huoditang Forest of the Qinling Mountains. The findings provide a new perspective for studying the spatial distribution characteristics and driving factors of dominant soil bacterial community components in subtropical forest ecosystems.

Keywords: Qinling Mountains; bacterial phyla; environmental factors; soil nutrients; spatial pattern; topographic factors.