Abstract
Elucidating the biodiversity of CO2-assimilating bacterial and algal communities in soils is important for obtaining a mechanistic view of terrestrial carbon sinks operating at global scales. “Red” acidic soils (Orthic Acrisols) cover large geographic areas and are subject to a range of management practices, which may alter the balance between carbon dioxide production and assimilation through changes in microbial CO2-assimilating populations. Here, we determined the abundance and diversity of CO2-assimilating bacteria and algae in acidic soils using quantitative PCR and terminal restriction fragment length polymorphism (T-RFLP) of the cbbL gene, which encodes the key CO2 assimilation enzyme (ribulose-1,5-bisphosphate carboxylase/oxygenase) in the Calvin cycle. Within the framework of a long-term experiment (Taoyuan Agro-ecosystem, subtropical China), paddy rice fields were converted in 1995 to four alternative land management regimes: natural forest (NF), paddy rice (PR), maize crops (CL), and tea plantations (TP). In 2012 (17 years after land use transformation), we collected and analyzed the soils from fields under the original and converted land management regimes. Our results indicated that fields under the PR soil management system harbored the greatest abundance of cbbL copies (4.33 × 108 copies g−1 soil). More than a decade after converting PR soils to natural, rotation, and perennial management systems, a decline in both the diversity and abundance of cbbL-harboring bacteria and algae was recorded. The lowest abundance of bacteria (0.98 × 108 copies g−1 soil) and algae (0.23 × 106 copies g−1 soil) was observed for TP soils. When converting PR soil management to alternative management systems (i.e., NF, CL, and TP), soil edaphic factors (soil organic carbon and total nitrogen content) were the major determinants of bacterial autotrophic cbbL gene diversity. In contrast, soil phosphorus concentration was the major regulator of algal cbbL community composition. Our results provide new insights into the diversity, abundance, and modulation of organisms responsible for microbial autotrophic CO2 fixation in red acidic soils subjected to changing management regimes.
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Acknowledgments
This study was financially supported by the National Natural Science Foundation of China (41430860; 41271279; 41301275), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB15020401), and the Chinese Academy of Sciences Visiting Professorship for Senior International Scientists awarded to Prof. A. S. Whiteley (2013T2S0013).
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Yuan, H., Ge, T., Chen, X. et al. Abundance and Diversity of CO2-Assimilating Bacteria and Algae Within Red Agricultural Soils Are Modulated by Changing Management Practice. Microb Ecol 70, 971–980 (2015). https://doi.org/10.1007/s00248-015-0621-8
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DOI: https://doi.org/10.1007/s00248-015-0621-8