Biological Invasions

, Volume 11, Issue 3, pp 651–661 | Cite as

Belowground mutualists and the invasive ability of Acacia longifolia in coastal dunes of Portugal

  • Susana Rodríguez-Echeverría
  • João A. Crisóstomo
  • Cristina Nabais
  • Helena Freitas
Original Paper

Abstract

The ability to form symbiotic associations with soil microorganisms and the consequences for plant growth were studied for three woody legumes grown in five different soils of a Portuguese coastal dune system. Seedlings of the invasive Acacia longifolia and the natives Ulex europaeus and Cytisus grandiflorus were planted in the five soil types in which at least one of these species appear in the studied coastal dune system. We found significant differences between the three woody legumes in the number of nodules produced, final plant biomass and shoot 15N content. The number of nodules produced by A. longifolia was more than five times higher than the number of nodules produced by the native legumes. The obtained 15N values suggest that both A. longifolia and U. europaeus incorporated more biologically-fixed nitrogen than C. grandiflorus which is also the species with the smallest distribution. Finally, differences were also found between the three species in the allocation of biomass in the different studied soils. Acacia longifolia displayed a lower phenotypic plasticity than the two native legumes which resulted in a greater allocation to aboveground biomass in the soils with lower nutrient content. We conclude that the invasive success of A. longifolia in the studied coastal sand dune system is correlated to its capacity to nodulate profusely and to use the biologically-fixed nitrogen to enhance aboveground growth in soils with low N content.

Keywords

AMF Broom Gorse Nitrogen Rhizobia 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Susana Rodríguez-Echeverría
    • 1
  • João A. Crisóstomo
    • 1
  • Cristina Nabais
    • 1
  • Helena Freitas
    • 1
  1. 1.Department of Botany, Centre for Functional EcologyUniversity of CoimbraCoimbraPortugal

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