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Background  The bacterial community of forest soils is influenced by environmental disturbance and/or meteorological temperature and precipitation. In this study, we investigated three bacterial communities in soils of a natural hardwood forest and two plantations of conifer,  Calocedrus formosana  and  Cryptomeria japonica , in a perhumid, low mountain area. By comparison with our previous studies with similar temperature and/or precipitation, we aimed to elucidate how disturbance influences the bacterial community in forest soils and whether bacterial communities in similar forest types differ under different climate conditions.    Results  Analysis of 16S ribosomal RNA gene clone libraries revealed that  Acidobacteria  and  Proteobacteria  were the most abundant phyla in the three forest soil communities, with similar relative abundance of various bacterial groups. However, UniFrac analysis based on phylogenetic information revealed differences of bacterial communities between natural hardwood forest and coniferous plantation soils. The diversities of bacterial communities of the replanted  Calocedrus  and  Cryptomeria  forests were higher than that in natural hardwood forest. The bacterial diversity of these three forest soil were all higher than those in the same forest types at other locations with less precipitation or with lower temperature. In addition, the distribution of some of the most abundant operational taxonomic units in the three communities differed from other forest soils, including those related to  Acidobacteria , α-, β- and γ- Proteobacteria .    Conclusions  Reforestation could increase the bacterial diversity. Therefore, soil bacterial communities could be shaped by the forestry management practices and climate differences in warm and humid conditions.    Electronic supplementary material  The online version of this article (doi:10.1186/s40529-014-0050-x) contains supplementary material, which is available to authorized users.

Comparison of soil bacterial communities in a natural hardwood forest and coniferous plantations in perhumid subtropical low mountains