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Impacts of forest conversion on soil bacterial community composition and diversity in subtropical forests

Meng, Miaojing, Lin, Jie, Guo, Xiaoping, Liu, Xin, Wu, Jiasen, Zhao, Youpeng, Zhang, Jinchi
Catena 2019 v.175 pp. 167-173
Actinobacteria, Cunninghamia lanceolata, bacterial communities, bamboos, carbon nitrogen ratio, community structure, forest types, gamma-Proteobacteria, land use, mixed forests, phylogeny, soil bacteria, soil pH, species diversity, total nitrogen, tropical forests
Forest conversion may affect the soil microbial community through impacts on soil properties. However, our understanding of the effects on the soil bacterial community remains limited. The objective of this study was to understand the impacts of forest conversion of native broad-leaved species on soil bacterial structure and diversity. The phylogeny structure and diversity of the soil bacterial communities were compared among four forest types. We found that the soil total nitrogen (TN) and C:N ratios were significantly different between a mixed forest and other forest types. The native forest and mixed forest contained a higher relative abundance of Actinobacteria, Gammaproteobacteria, and Acidimicrobiia compared with the Chinese fir and Bamboo forests, but more unique operational taxonomic units (OTUs) were found in the Chinese fir and Bamboo forests. Soil bacteria in bamboo forest and Chinese fir forest showing a higher diversity but a lower total sequencing number than native forest and mixed forest. Among the soil properties, pH was an important variable that contributing to both soil bacterial communities and soil alpha diversities. Our work suggests that after a long-tern forest conversion, both land-use history and vegetation species strongly influence soil bacteria communities, and soil pH is a main factor that influences soil bacterial structure.