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Differential distribution patterns of ammonia-oxidizing archaea and bacteria in acidic soils of Nanling National Nature Reserve forests in subtropical China

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Abstract

In addition to ammonia-oxidizing bacteria (AOB) the more recently discovered ammonia-oxidizing archaea (AOA) can also oxidize ammonia, but little is known about AOA community structure and abundance in subtropical forest soils. In this study, both AOA and AOB were investigated with molecular techniques in eight types of forests at surface soils (0–2 cm) and deep layers (18–20 cm) in Nanling National Nature Reserve in subtropical China. The results showed that the forest soils, all acidic (pH 4.24–5.10), harbored a wide range of AOA phylotypes, including the genera Nitrosotalea, Nitrososphaera, and another 6 clusters, one of which was reported for the first time. For AOB, only members of Nitrosospira were retrieved. Moreover, the abundance of the ammonia monooxygenase gene (amoA) from AOA dominated over AOB in most soil samples (13/16). Soil depth, rather than forest type, was an important factor shaping the community structure of AOA and AOB. The distribution patterns of AOA and AOB in soil layers were reversed: AOA diversity and abundances in the deep layers were higher than those in the surface layers; on the contrary, AOB diversity and abundances in the deep layers were lower than those in the surface layers. Interestingly, the diversity of AOA was positively correlated with pH, but negatively correlated with organic carbon, total nitrogen and total phosphorus, and the abundance of AOA was negatively correlated with available phosphorus. Our results demonstrated that AOA and AOB were differentially distributed in acidic soils in subtropical forests and affected differently by soil characteristics.

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Acknowledgments

This research was supported by a research grant to Yong-Feng Wang from National Natural Science Foundation of China [31470562] and fund to Guangdong Nanling Forest Ecology Station from The National Forestry Bureau of China. We would like to thank Mr. Sanwu Zhang for support in field sampling and Ms. Kelly Lau at The University of Hong Kong for general laboratory support in this research work. We are grateful to the editor and the reviewers for their careful revisions and constructive suggestions.

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Correspondence to Yong-Feng Wang.

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The authors declare that they have no conflict of interest.

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Xian-Hua Gan and Fang-Qiu Zhang have contributed equally to this work.

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Gan, XH., Zhang, FQ., Gu, JD. et al. Differential distribution patterns of ammonia-oxidizing archaea and bacteria in acidic soils of Nanling National Nature Reserve forests in subtropical China. Antonie van Leeuwenhoek 109, 237–251 (2016). https://doi.org/10.1007/s10482-015-0627-8

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  • DOI: https://doi.org/10.1007/s10482-015-0627-8

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