Abstract
In boreal peatlands, the aboveground (plant) and belowground (microbial) communities are acutely linked because the whole soil profile is partially decomposed plant matter (peat), and dictates the nutrients available to the belowground system. We characterized the aboveground and belowground communities in two boreal peatlands: a Sphagnum-dominated fen and a Carex-dominated fen. We link the plant and microbial communities by observing plant, litter and peat carbon and nitrogen values. The Sphagnum-dominated fen had greater plant diversity but provided low quality litter inputs (high carbon:nitrogen) that formed peat and that corresponded with greater fungi:bacteria and Gram-positive:Gram-negative bacteria microbial community compared to the Carex-dominated fen. The higher quality plant inputs in the Carex-dominated fen supported a 5 × greater microbial biomass that was also 2 × more active (as measure by CO2 production). In this approach we highlight that peatlands and their component plant and microbial communities play-out along a common resource-spectrum that dictates ‘fast’ vs ‘slow’ carbon and nutrient cycling (i.e., a plant–soil interaction spectrum) that can, in turn, affect carbon storage potential. As peatland plant community composition is predicted to shift and decomposition rates are expected to increase under climate change, our work highlights the importance of understanding plant–soil microbial interactions.
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Acknowledgements
We thank the Ontario Ministry of Natural Resources and Forestry (Dr. Jim McLaughlin and Dr. Maara Packalen) for the access to the research sites and Dr. Brian Branfireun for continued support with our research program. We would also like to thank Christian Gallant and Dr. Aaron Mills from Agriculture and Agri-Food Canada for helpful comments and suggestions on the PLFA protocol and GC analysis. We thank Devdutt Kamath, Grace Carscallen, Ting Sun, Madelaine Anderson, Jennifer Blythe, Matthew Meehan and Carlos Barreto for assistance with field data collection. We also thank the two anonymous reviewers and editor for comments that greatly improved our manuscript.
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This work was supported by funding from NSERC (Natural Sciences and Engineering Research Council of Canada) Discovery Grants program to ZL (#418241-2012).
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CLL and ZL conceived and designed the study. CLL performed the study and analyzed the data. CLL and ZL wrote the manuscript.
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Lyons, C.L., Lindo, Z. Above- and belowground community linkages in boreal peatlands. Plant Ecol 221, 615–632 (2020). https://doi.org/10.1007/s11258-020-01037-w
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DOI: https://doi.org/10.1007/s11258-020-01037-w