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Related Experiment Video

Updated: Mar 6, 2026

Investigation of Plant Interactions Across Common Mycorrhizal Networks Using Rotated Cores
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The relation between above- and belowground biomass allocation patterns and competitive ability.

R Aerts1, R G A Boot1, P J M van der Aart1

  • 1Dept of Plant Ecology and Evolutionary Biology, University of Utrecht, P.O. Box 800.84, NL-3508 TB, Utrecht, The Netherlands.

Oecologia
|March 18, 2017
PubMed
Summary
This summary is machine-generated.

Molinia caerulea outcompetes Erica tetralix and Calluna vulgaris in nutrient-rich conditions, primarily through belowground competition. This grass demonstrates plasticity in resource allocation, overcoming trade-offs between above- and belowground resource acquisition.

Keywords:
AllocationCanopy structureCompetitionPlasticityRooting pattern

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Area of Science:

  • Plant Ecology
  • Community Ecology
  • Plant Physiology

Background:

  • Heathland ecosystems are characterized by nutrient-poor soils, influencing plant community structure.
  • Molinia caerulea dominates nutrient-rich areas, while Erica tetralix and Calluna vulgaris thrive on nutrient-poor soils.
  • Interspecific competition plays a crucial role in shaping plant community dynamics.

Purpose of the Study:

  • To investigate the competitive interactions between Molinia caerulea, Erica tetralix, and Calluna vulgaris under varying nutrient levels and competition types.
  • To determine the mechanisms driving the competitive success of Molinia caerulea in nutrient-rich environments.
  • To assess the trade-offs between aboveground and belowground resource competition in these species.

Main Methods:

  • A 2-year replacement series experiment was conducted with factorial combinations of nutrient supply (unfertilized and fertilized) and competition types (no, aboveground, belowground, full).
  • Biomass allocation, root-to-shoot ratios, and spatial arrangement of plant organs were analyzed.
  • Nutrient levels included 10 g N + 2 g P + 10 g K m⁻² yr⁻¹.

Main Results:

  • Molinia caerulea consistently allocated more biomass to roots than Erica and Calluna, regardless of nutrient availability.
  • Belowground competition was the primary driver of competitive outcomes in fertilized conditions, with Molinia outcompeting the evergreens.
  • Aboveground competition did not significantly affect biomass, but Molinia adjusted its canopy structure by positioning leaves higher.
  • Increased nutrient supply enhanced biomass for all species, with Molinia showing the greatest increase.

Conclusions:

  • Molinia caerulea's competitive advantage at high nutrient levels is due to high productivity, root biomass allocation, extensive root systems, and canopy plasticity.
  • The study suggests that trade-offs between above- and belowground resource competition can be overcome through phenotypic plasticity in resource allocation and organ arrangement.
  • Species-specific differences in specific leaf area and specific root length also contribute to competitive ability.