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Plant Ecology

, Volume 205, Issue 1, pp 87–104 | Cite as

N2 fixation in three perennial Trifolium species in experimental grasslands of varied plant species richness and composition

  • Georg Carlsson
  • Cecilia Palmborg
  • Ari Jumpponen
  • Michael Scherer-Lorenzen
  • Peter Högberg
  • Kerstin Huss-Danell
Article

Abstract

This study is the first to investigate quantitative effects of plant community composition and diversity on N2 fixation in legumes. N2 fixation in three perennial Trifolium species grown in field plots with varied number of neighbouring species was evaluated with the 15N natural abundance method (two field sites, several growing seasons, no N addition) and the isotope dilution method (one site, one growing season, 5 g N m−2). The proportion of plant N derived from N2 fixation, pNdfa, was generally high, but the N addition decreased pNdfa, especially in species-poor communities. Also following N addition, the presence of grasses in species-rich communities increased pNdfa in T. hybridum and T. repens L., while legume abundance had the opposite effect. In T. repens, competition for light from grasses appeared to limit growth and thereby the amount of N2 fixed at the plant level, expressed as mg N2 fixed per sown seed. We conclude that the occurrence of diversity effects seems to be largely context dependent, with soil N availability being a major determinant, and that species composition and functional traits are more important than species richness regarding how neighbouring plant species influence N2 fixation in legumes.

Keywords

BIODEPTH Biodiversity Clover Functional traits 15N natural abundance 15N isotope dilution 

Notes

Acknowledgements

We are grateful to Christa Mulder, Alexandra Prinz and Ernst-Detlef Schulze for substantial contributions to the set-up of the experiment and data collection, and Christa Mulder, Ernst-Detlef Schulze and Osei Ampomah for valuable discussions. We thank Ann-Sofi Hahlin and Kristina Johansson for technical assistance, and all of the people who assisted in maintaining the plots, harvests and sample preparations. Svalöf-Weibull AB (Lännäs, Sweden) kindly provided seeds. Funding for this project was provided by the European Commission (Framework IV, contract ENV4-CT95-0008) and the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Georg Carlsson
    • 1
    • 5
  • Cecilia Palmborg
    • 1
  • Ari Jumpponen
    • 1
    • 2
    • 3
  • Michael Scherer-Lorenzen
    • 4
  • Peter Högberg
    • 2
  • Kerstin Huss-Danell
    • 1
  1. 1.Department of Agricultural Research for Northern SwedenSwedish University of Agricultural Sciences (SLU)UmeåSweden
  2. 2.Department of Forest Ecology and Management, Soil Science SectionSwedish University of Agricultural Sciences (SLU)UmeåSweden
  3. 3.Division of BiologyKansas State UniversityManhattanUSA
  4. 4.ETH ZürichInstitute of Plant SciencesZürichSwitzerland
  5. 5.INRA-SupAgro, UMR 210 Eco&SolsMontpellier Cedex 1France

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