Abstract
Background and aims
Microbial communities are the primary drivers of organic matter decomposition in peatlands. However, limited knowledge is available regarding depth-dependent microbial community structure and function in East Asian peatlands, using cultivation independent approaches.
Methods
We investigated the vertical stratification of prokaryote and fungal communities in a moderately rich fen in northeast China (Hani) and a rich fen in southwest China (Riganqiao).
Results
Fungal and prokaryotic operational taxonomic unit (OTU) composition exhibited strong site and/or depth responses. Prokaryotic OTUs exhibited the greatest alpha diversity at the mesotelm ‘hot spot’, whereas the predicted metagenomic metabolic functions did not align with the pattern of prokaryote alpha diversity. The large cover of shrubs contributed to a greater relative abundance of ericoid- and ecto-mycorrhizal fungi at Hani, whereas Riganqiao showed more arbuscular mycorrhizal fungi. Soil pH and water table depth were among the predominant abiotic factors associated with microbial community composition.
Conclusions
Projected shifts in hydrology and/or vegetation with global change may cause substantial impacts on peatland microorganisms and thus the associated biogeochemistry. It is critical to better understand the mechanism of the discrepancy between microbial community structure and the functions at the mesotelm ‘hot spot’ when evaluating the ecosystem functions in peatlands.
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Acknowledgments
The work was supported by the National Natural Science Foundation of China (41601098), the Young Excellence Program for the Teachers of College of Forestry, Northwest A&F University (Z111021603), Natural Science Foundation of Shaanxi Province of China (2016JQ3022). The DNA sequencing work was supported by the USDA Forest Service Northern Research Station Climate Change Program, the US National Science Foundation [grant number DEB-1146149], and the U.S. Department of Energy Joint Genome Institute Community Science Program [Proposal ID 1445]. The work conducted by the U.S. Department of Energy Joint Genome Institute, a DOE Office of Science User Facility, is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. We are grateful to Nate Basiliko and Michael Carson of Laurentian University for nutrient analyses. We thank Prof. Tim Moore of McGill University, Dr. Erik Lilleskov of the US Forest Service and two anonymous reviewers for their thoughtful comments that significantly improved this manuscript.
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Wang, M., Tian, J., Bu, Z. et al. Structural and functional differentiation of the microbial community in the surface and subsurface peat of two minerotrophic fens in China. Plant Soil 437, 21–40 (2019). https://doi.org/10.1007/s11104-019-03962-w
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DOI: https://doi.org/10.1007/s11104-019-03962-w