Abstract
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. Nomenclature: Allan (1961) with amendments suggested by Connor & Edgar (1987), and Webb et al. (1988).
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Coriaria had low stem density but dominated biomass by the vigorous stage.
CoriariaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Coriaria occurred at low density but dominated above-ground biomass by the vigorous stage”
Claim · model-written summary
Buddleja stem density in the young stage was 5.3 ± 1.0 stems/m2.
BuddlejaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Buddleja occurred at 5.3 ± 1.0 stems/m2 in the young stage”
Claim · model-written summary
Buddleja biomass peaked at 520–535 g.m−2 during young and vigorous stages.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
Claim · model-written summary
Mineral soil nitrogen rose with Coriaria biomass.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral soil N increased with above-ground Coriaria biomass (r2 = 0.45)”
Claim · model-written summary
Mineral soil nitrogen did not vary with Buddleja biomass.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral soil N increased with above-ground Coriaria biomass (r2 = 0.45), but did not vary with Buddleja biomass”
t0“Buddleja davidii”
Claim · model-written summary
Soil phosphorus rose with Buddleja biomass.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil P increased with Buddleja biomass (r2 = 0.35)”
Claim · model-written summary
Soil phosphorus did not vary with Coriaria biomass.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil P increased with Buddleja biomass (r2 = 0.35), but not with Coriaria biomass”
t0“Coriaria arborea”
Claim · model-written summary
Exotic species made up 70–80% early but about 15% in the mature stage.
- Outcome
- species present were exotice0
- Direction
- declinede0
- Value
- 70–80%e0
- Qualifier
- about 15% by the mature stagee0
Not reportedTaxon
Verbatim
e0“In early successional stages, 70–80% of the species present were exotic, but this declined to about 15% by the mature stage”
t0“Coriaria arborea”
Claim · model-written summary
Exotic species richness declined as Coriaria biomass increased.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exotic plant species richness declined with increasing Coriaria biomass”
Claim · model-written summary
Other diversity measures did not vary with either shrub’s biomass.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no other measures of diversity varied with either Coriaria or Buddleja biomass”
Claim · model-written summary
Buddleja altered soil N:P stoichiometry.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A key ecosystem effect of the invasive exotic Buddleja is alteration of soil N:P stoichiometry”