Nomenclature: Allan (1961)with amendments suggested by Connor & Edgar (1987), and Webb et al.(1988).
Contrasting impacts of a native and an invasive exotic shrub on flood-plain succession
Article first published online: 24 FEB 2009
2005 IAVS - the International Association of Vegetation Science
Journal of Vegetation Science
Volume 16, Issue 1, pages 135–142, February 2005
How to Cite
Bellingham, P. J., Peltzer, D. A. and Walker, L. R. (2005), Contrasting impacts of a native and an invasive exotic shrub on flood-plain succession. Journal of Vegetation Science, 16: 135–142. doi: 10.1111/j.1654-1103.2005.tb02347.x
- Issue published online: 24 FEB 2009
- Article first published online: 24 FEB 2009
- Received 7 April 2004; Accepted 21 January 2005. Co-ordinating Editor: M. Pärtel.
- Buddleja davidii;
- Coriaria arborea;
- N:P stoichiometry;
- Nutrient accumulation;
- Primary succession;
- Soil nutrient
Abstract. Question: How do Coriaria arborea, an N-fixing native shrub, and Buddleja davidii, a non-N-fixing exotic shrub, affect N:P stoichiometry in plants and soils during early stages of primary succession on a flood-plain?
Location: Kowhai River Valley, northeast South Island, New Zealand.
Methods: We measured soil and foliar nutrient concentrations, light levels, plant community composition and the above-ground biomass of Coriaria and Buddleja in four successional stages: open, young, vigorous and mature.
Results: Coriaria occurred at low density but dominated above-ground biomass by the vigorous stage. Buddleja occurred at 5.3 ± 1.0 stems/m2 in the young stage and reached a maximum biomass of 520–535 g.m-2 during the young and vigorous stages. Mineral soil N increased with above-ground Coriaria biomass (r2= 0.45), but did not vary with Buddleja biomass. In contrast, soil P increased with Buddleja biomass (r2= 0.35), but not with Coriaria biomass. In early successional stages, 70–80% of the species present were exotic, but this declined to about 15% by the mature stage. Exotic plant species richness declined with increasing Coriaria biomass, but no other measures of diversity varied with either Coriaria or Buddleja biomass.
Conclusion: These results demonstrate that Buddleja dominates early succession and accumulates P whereas Coriaria dominates later succession and accumulates N. A key ecosystem effect of the invasive exotic Buddleja is alteration of soil N:P stoichiometry.