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Investigation of Plant Interactions Across Common Mycorrhizal Networks Using Rotated Cores
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Directly quantifying multiple interacting influences on plant competition.

Clare J Trinder1, Rob W Brooker2, Hazel Davidson1

  • 1School of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, UK.

Plant, Cell & Environment
|November 11, 2020
PubMed
Summary
This summary is machine-generated.

Plant competition for nitrogen (N) is influenced by species identity and N ion type. Biomass production reflects longer-term competition outcomes better than direct N uptake measurements.

Keywords:
15NDactylis glomerataPlantago lanceolataammoniumdirect uptakeinterspecific competitionintraspecific competitionisotope pool-dilutionnitrate

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Area of Science:

  • Plant Ecology
  • Belowground Competition
  • Nutrient Cycling

Background:

  • Understanding plant competition is crucial for predicting ecosystem dynamics.
  • Belowground competition for essential nutrients like nitrogen (N) significantly impacts plant communities.
  • Differentiating direct nutrient uptake from biomass as competition indicators is key.

Purpose of the Study:

  • To investigate factors influencing direct belowground competition for ammonium and nitrate between herbaceous perennials.
  • To compare the direct measurement of N uptake with biomass production as proxies for competition.
  • To analyze the effects of species identity, N availability, N ion type, and location on plant competition.

Main Methods:

  • Directly measured simultaneous capture of soil ammonium and nitrate by co-existing Dactylis glomerata and Plantago lanceolata.
  • Utilized linear models to assess direct effects and pairwise interactions of various factors.
  • Measured plant biomass as an indirect proxy for competition outcomes.

Main Results:

  • Focal species identity, N ion type (ammonium/nitrate), and their interaction with neighbor N uptake significantly affected both N uptake and biomass.
  • Location primarily influenced biomass production, with less effect on N uptake.
  • N uptake increased linearly with biomass only in isolated plants, not in competitive settings.

Conclusions:

  • Biomass production serves as a more integrative, longer-term proxy for the cumulative effects of multiple plant interactions, including N competition.
  • Direct N capture and biomass accumulation provide distinct insights into the mechanisms and outcomes of plant competition.
  • Plant competition dynamics are complex, influenced by species-specific traits and environmental factors affecting nutrient availability and uptake.