Responses to competition for nitrogen between subtropical native tree seedlings and exotic grasses are species-specific and mediated by soil N availability

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2019
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Greenfield, Lucy
Pritsch, Karin
Schmidt, Susanne
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Competitive interactions between native tree seedlings and exotic grasses frequently hinder forest restoration. We investigated the consequences of competition with exotic grasses on the growth and net nitrogen (N) uptake capacity of native rainforest seedlings used for reforestation depending on soil N availability and N source. Tree seedlings and grasses were grown in the greenhouse in different competition regimes (one tree species vs one grass species) and controls (grass monocultures or single tree seedlings) at low and high soil N. After 8 weeks, we quantified net N uptake capacity using 15N-labelled organic (i.e., glutamine and arginine) and inorganic (i.e., ammonium and nitrate) N sources and biomass indices. Depending on soil N availability, we observed different species-specific responses to growth and N acquisition. Tree seedlings generally increased their net N uptake capacity in response to competition with grasses, although overall seedling growth was unaffected. In contrast, the responses to competition by the grasses were species-specific and varied with soil N availability. The different N acquisition strategies suggest the avoidance of competition for N between trees and grasses. Overall, the results highlight that quantifying underlying mechanisms of N acquisition complements the information on biomass allocation as a measure of responses to competition, particularly with varying environmental conditions.

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ISO 690BUENO, Andrea, Lucy GREENFIELD, Karin PRITSCH, Susanne SCHMIDT, Judy SIMON, 2019. Responses to competition for nitrogen between subtropical native tree seedlings and exotic grasses are species-specific and mediated by soil N availability. In: Tree Physiology. 2019, 39(3), pp. 404-416. ISSN 0829-318X. eISSN 1758-4469. Available under: doi: 10.1093/treephys/tpy096
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@article{Bueno2019-03-01Respo-43239,
  year={2019},
  doi={10.1093/treephys/tpy096},
  title={Responses to competition for nitrogen between subtropical native tree seedlings and exotic grasses are species-specific and mediated by soil N availability},
  number={3},
  volume={39},
  issn={0829-318X},
  journal={Tree Physiology},
  pages={404--416},
  author={Bueno, Andrea and Greenfield, Lucy and Pritsch, Karin and Schmidt, Susanne and Simon, Judy}
}
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