Abstract
The paradigm in prairie ecology is that fire is one of the key factors determining vegetation composition. Fire can impact grassland ecosystems in various ways, including changing plant species composition and inducing nitrogen loss. I found that 17 years of different burning frequencies in infertile grassland had only a minor impact on the vegetation composition and diversity. The only major impact from increasing the frequency of fires was a decrease of Poa pratensis abundance. However, other plant species did not respond to the change in Poa abundance. This result contrasts with previous studies in savannas and more productive grasslands, where the balance between trees, grasses, and the elimination of the litter layer can result in large vegetation changes. However, in this system primary productivity was low, litter did not accumulate and no major vegetation shifts occurred. Thus, the long-term vegetation impacts of burning in an infertile, low-productivity prairie were minimal.
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Acknowledgements
This research has been supported by the University of Nebraska and NSF grants 0080382, 0087206 and 0100133. Thanks are due to Troy Mielke and the Cedar Creek interns for help in the field, and Amy Symstad, Kate Bradley, Ramesh Laungani, Cathleen McFadden and Kate Stoysich for comments.
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Communicated by Alan Knapp.
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Knops, J.M.H. Fire does not alter vegetation in infertile prairie. Oecologia 150, 477–483 (2006). https://doi.org/10.1007/s00442-006-0535-8
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DOI: https://doi.org/10.1007/s00442-006-0535-8