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Related Experiment Video

Updated: Aug 8, 2025

Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites
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Biochar mitigates allelopathic effects in temperate trees.

Leeladarshini Sujeeun1, Sean C Thomas1

  • 1Institute of Forestry and Conservation, John H. Daniels Faculty of Architecture, Landscape, and Design, University of Toronto, Toronto, ON, Canada.

Ecological Applications : a Publication of the Ecological Society of America
|March 3, 2023
PubMed
Summary
This summary is machine-generated.

Biochar (BC) can counteract tree allelopathy. This study shows BC mitigates growth suppression from invasive Norway maple and native black walnut, benefiting native seedlings like silver maple and paper birch.

Keywords:
allelopathybiocharcharcoalcompetitioninvasive speciesleaf litter

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Area of Science:

  • Forest Ecology
  • Soil Science
  • Plant Physiology

Background:

  • Allelopathic trees, both native and invasive, can dominate North American forests.
  • Pyrogenic carbon (PyC), found in forest soils, can reduce the availability of plant-inhibiting chemicals (allelochemicals).
  • Biochar (BC), a form of PyC, is produced from biomass pyrolysis.

Purpose of the Study:

  • To investigate if biochar (BC) can reduce the allelopathic effects of black walnut and Norway maple.
  • To assess BC's impact on the growth of silver maple and paper birch seedlings.

Main Methods:

  • Seedling growth was tested in soils with leaf litter from black walnut, Norway maple, and American basswood (control).
  • Varying BC dosages were applied to these litter-incubated soils.
  • Seedling responses to juglone, a black walnut allelochemical, were also examined with and without BC.

Main Results:

  • Allelopathic leaf litter and juglone significantly suppressed seedling growth.
  • BC treatments substantially reduced these suppressive effects, indicating allelochemical sorption.
  • BC application increased silver maple biomass by ~35% and paper birch biomass by over 100% in some cases.

Conclusions:

  • Biochar (BC) can effectively counteract tree allelopathy in temperate forests.
  • Natural PyC may influence forest community structure.
  • BC shows potential as a soil amendment to mitigate invasive species' allelopathic impacts.