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Plant Ecology

, Volume 197, Issue 2, pp 183–195 | Cite as

Large-scale manipulation of plant litter and fertilizer in a managed successional temperate grassland

  • L. Brian Patrick
  • Lauchlan H. FraserEmail author
  • Mark W. Kershner
Article

Abstract

Plant litter may play an important role in herbaceous plant communities by limiting primary production and influencing plant species richness. However, it is not known how the effect of litter interacts with fertilization. We tested for the role of litter and fertilization in a large-scale experiment to investigate effects on diversity and biomass of plant species, growth forms, native vs. non-native groups, and abiotic ecosystem components (e.g., soil moisture, PAR). We manipulated plant litter (removed vs. left in situ) and nutrient availability (NPK-fertilized vs. unfertilized) for 4 years in 314-m2 plots, replicated six times, in an old-field grassland. While many of our species-level results supported previously published studies and theory, our plant group results generally did not. Specifically, grass species richness and forb biomass was not affected by either fertilization or plant litter. Moreover, plant litter removal significantly increased non-native plant species richness. Relative to native plant species, all of our experimental manipulations significantly increased both the biomass and the species richness of non-native plant species. Thus, this grassland system was sensitive to management treatments through the facilitation of non-native plant species. We coupled biotic and abiotic components within a nonmetric multidimensional scaling (NMS) analysis to investigate treatment effects, which revealed that specific treatments altered ecosystem development. These results suggest that fertilization and plant litter may have larger impacts on plant communities and on ecosystem properties than previously understood, underscoring the need for larger-scale and longer-term experiments.

Keywords

Disturbance Nitrogen NMS ordination Non-native species Plant functional group Species diversity 

Notes

Acknowledgments

The authors would like to thank J. Yao, W. Cook, and R. Holt for helpful comments on an early draft of this paper. We also thank C. Carlyle, C. Picard, T. Miletti, J. Karnezis, S. Carty, E. Madson, A. Landau, E. Lawrence, several other graduate and undergraduate students for their help in the field and laboratory, B. Andreas for help identifying some plant species, and The University of Akron and the Bath Township Trustees for allowing us to use the BNP. A Research Initiative II grant to L. Fraser from the University of Akron helped fund the project and a Canada Research Chair awarded to L. Fraser provided the time to finish the writing.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • L. Brian Patrick
    • 1
  • Lauchlan H. Fraser
    • 2
    Email author
  • Mark W. Kershner
    • 1
  1. 1.Department of Biological SciencesKent State UniversityKentUSA
  2. 2.Department of Natural Resource SciencesThompson Rivers UniversityKamloopsCanada

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