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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Published on: March 12, 2013

Litter evenness influences short-term peatland decomposition processes.

Susan E Ward1, Nick J Ostle, Niall P McNamara

  • 1Lancaster Environment Centre, Lancaster University, Lancaster, UK. s.e.ward@lancaster.ac.uk

Oecologia
|May 1, 2010
PubMed
Summary

Peatland plant species evenness significantly impacts decomposition rates and carbon release. Higher evenness and dominant species like Calluna vulgaris accelerate decomposition, influencing climate change dynamics.

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Area of Science:

  • Ecology
  • Biogeochemistry
  • Environmental Science

Background:

  • Peatlands store vast amounts of carbon, but climate and land-use changes may increase decomposition and C release.
  • Decomposition is influenced by abiotic factors (temperature, moisture) and biotic factors (litter quality, vegetation change).
  • While species identity and diversity effects on decomposition are studied, the impact of species evenness is less understood.

Purpose of the Study:

  • To investigate the effects of short-term changes in peatland plant species evenness on decomposition processes.
  • To assess how changes in litter evenness influence litter weight loss, carbon dioxide (CO2) respiration, and leachate carbon (C) and nitrogen (N).

Main Methods:

  • Incubation of mixed peatland plant litter assemblages for 307 days.
  • Measurement of litter weight loss, respired CO2, and leachate C and N.
  • Analysis of the influence of species evenness and dominant species identity on decomposition rates.

Main Results:

  • Increased species evenness in mixed litters enhanced decomposition rates, evidenced by greater weight loss and dissolved organic N in leachate.
  • Dominant species identity significantly affected decomposition rates; Calluna vulgaris dominance led to the highest rates, while Pleurozium schreberi dominance resulted in the lowest.
  • Interactions between evenness and dominant species were observed for litter weight loss and leachate N.
  • Positive non-additive effects of litter mixing were noted for litter weight loss.

Conclusions:

  • Changes in plant community evenness play a crucial role in short-term decomposition in UK peatlands.
  • Both species evenness and the identity of dominant species are critical factors regulating peatland decomposition and C cycling.
  • Understanding these dynamics is essential for predicting peatland responses to environmental change.