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Effects of nitrogen and sulphur gradients on plant competition, N and S use efficiencies and species abundance in a grassland plant mixture

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Abstract

Sulphur (S) depletion of grassland soils has occurred in Europe for many decades. This is known to promote a decrease in ecosystem productivity and is suspected to alter plant community structure. Considering the strong links between nitrogen (N) and S metabolism in plants, these effects should depend on N availability. We tested this hypothesis in a pot experiment, considering a four grassland species plant mixture (three Poaceæs: Lolium perenne, Agrostis capillaris and Poa pratensis and one Fabaceæ: Trifolium repens), and submitted it to a double N and S gradient. We used labelled 15N-fertilizer and 34S-fertilizer in order to determine both nutrient use efficiencies by each species and to analyze the influence of competition for these nutrients on plant mixture dynamics. We compared species relative physiological performance (RPP) in the monoculture and their relative ecological performance (REP) in the mixture of the four species. We analysed gradient effects at establishment and at regrowth after cutting. At establishment, grass production and S use efficiency increased along the N gradient. The S gradient slightly favoured the dominance of L. perenne, increased A. capillaris production and enhanced N use efficiency of both species. At regrowth, increased S promoted more significant effects, enhancing T. repens performance in increasing its N2 fixation ability and maintaining this at high N. It also induced a change in grass species relative performance (dry matter production and N use efficiency) at high N, enhancing that of L. perenne and decreasing that of A. capillaris. At both establishment and regrowth, RPP did not reflect REP, meaning that species behave differently along the gradient when grown in mixture. Finally, the S gradient and the N gradient modulated relative plant species abundance. It appears that modulation of S availability could be used as a tool to drive grassland community structure.

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Acknowledgments

We wish to thank R Ségura and AF Ameline for assistance in the maintenance of the experiment. We also thank P Beauclair and J Bonnefoy for help during harvests. T. Gordon and anonymous referees improved the manuscript through helpful comments. Their assistance is gratefully acknowledged.

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Authors and Affiliations

  1. INRA, UMR950, 14000, Caen, France

    T. Tallec, S. Diquélou, C. Fauveau, M. P. Bataillé & A. Ourry

  2. Université de Caen Basse-Normandie, UMR950 Ecophysiologie Végétale Agronomie et nutrition N, C, S, 14032, Caen cedex, France

    T. Tallec, S. Diquélou, C. Fauveau, M. P. Bataillé & A. Ourry

Authors
  1. T. Tallec
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  2. S. Diquélou
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  3. C. Fauveau
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  4. M. P. Bataillé
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  5. A. Ourry
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Correspondence to S. Diquélou.

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Responsible Editor: Herbert Johannes Kronzucker.

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Tallec, T., Diquélou, S., Fauveau, C. et al. Effects of nitrogen and sulphur gradients on plant competition, N and S use efficiencies and species abundance in a grassland plant mixture. Plant Soil 313, 267–282 (2008). https://doi.org/10.1007/s11104-008-9699-9

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  • DOI: https://doi.org/10.1007/s11104-008-9699-9

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