Abstract
Background and aims
Climate change alters regional plant species distributions, creating new combinations of litter species and soil communities. Biogeographic patterns in microbial communities relate to dissimilarity in microbial community function, meaning novel litters to communities may decompose differently than predicted from their chemical composition. Therefore, the effect of a litter species in the biogeochemical cycle of its current environment may not predict patterns after migration. Under a tree migration sequence we test whether litter quality alone drives litter decomposition, or whether soil communities modify quality effects.
Methods
Litter and soils were sampled across an elevation gradient of different overstory species where lower elevation species are predicted to migrate upslope. We use a common garden, laboratory microcosm design (soil community x litter environment) with single and mixed-species litters.
Results
We find significant litter quality and microbial community effects (P < 0.001), explaining 47 % of the variation in decomposition for mixed-litters.
Conclusion
Soil community effects are driven by the functional breadth, or historical exposure, of the microbial communities, resulting in lower decomposition of litters inoculated with upslope communities. The litter x soil community interaction suggests that litter decomposition rates in forests of changing tree species composition will be a product of both litter quality and the recipient soil community.
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Acknowledgments
This research was funded by the U.S. Forest Service through a cooperative agreement to MAB and JK, the U.S. Environmental Protection Agency through a Science to Achieve Results (STAR) Fellowship to ADK, and the U.S. National Science Foundation through the Coweeta Long Term Ecological Research (LTER) Program. We thank the National Park Service for granting us a research permit for the Blue Ridge Parkway National Park.
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Keiser, A.D., Knoepp, J.D. & Bradford, M.A. Microbial communities may modify how litter quality affects potential decomposition rates as tree species migrate. Plant Soil 372, 167–176 (2013). https://doi.org/10.1007/s11104-013-1730-0
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DOI: https://doi.org/10.1007/s11104-013-1730-0