Soil bacterial communities shaped by geochemical factors and land use in a less-explored area, Tibetan Plateau

BMC Genomics

Research Article

Jinfeng Wang¹  Hui Zhao¹  Fangqing Zhao¹  Fei Liu²  Xiangyu Guan³  Ximing Luo⁴  Jianjun Wang⁵ 

[1] Beijing Institutes of Life Science, Chinese Academy of Sciences, 100101, Beijing, China;Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences, 100083, Beijing, China;Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences, 100083, Beijing, China;School of Ocean Sciences, China University of Geosciences, 100083, Beijing, China;School of Ocean Sciences, China University of Geosciences, 100083, Beijing, China;State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 210008, Nanjing, China;

关键词: Bacterial community;    Homogenization;    Metagenomics;    Soil;    Tibetan Plateau;   

DOI  :  10.1186/1471-2164-14-820

 received in 2013-06-09, accepted in 2013-11-20,  发布年份 2013

来源: Springer

【 摘 要 】

BackgroundAs the largest low-latitude permafrost region, the Tibetan Plateau (TP) is an important part of the earth’s terrestrial ecosystem and one of the most vulnerable areas to climate change and human activities. However, to the best of our knowledge, the bacterial communities in TP soils and their roles in biogeochemical cycles remain limited.ResultsIn this study, we report the bacterial community structure and function as well as their correlation with environmental factors in TP major ecosystems (farmland, alpine meadow and oligosaline lake) by using metagenomic approaches. Compared with other soil samples in various environments, TP soils share a core set of microorganisms with a distinct abundance and composition. Among TP soil samples, the taxonomic and functional composition of bacterial communities among the upper (3-5 cm) and lower (18-20 cm) soils of farmland sites were highly similar, whereas the dissimilarities within alpine meadow samples were significantly greater than among farmland samples. A similar pattern was observed in elements cycles and pathways associated with adaption to environment and land use types. Canonical correlation analysis revealed that the bacterial communities in most of farmland and alpine meadow soil samples were also significantly correlated with geogenic variables. Specifically, the root-nodule bacteria are negatively correlated with the soil moisture and pH, while Thiobacillus associated with sulfur cycles show potential responses to low temperature and intense UV radiation.ConclusionsThese findings indicate that the bacterial community structure and functions in TP soils were influenced by both human activities and soil environmental properties, and that the bacterial communities appeared to be more homogenized in the farmland soils compared with pristine alpine meadows.

【 授权许可】

Unknown   
© Guan et al.; licensee BioMed Central Ltd. 2013. This article is published under license to BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.