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Resource contrast in patterned peatlands increases along a climatic gradient.

Maarten B Eppinga1, Max Rietkerk, Lisa R Belyea

  • 1Department of Environmental Sciences, Copernicus Institute, Utrecht University, P.O. Box 80115, 3508 TC Utrecht, The Netherlands. Maarten.Eppinga@uvm.edu

Ecology
|September 15, 2010
PubMed
Summary
This summary is machine-generated.

Peatland hummock-hollow patterning shifts with climate, from nutrient-rich hollows in wet areas to nutrient-rich hummocks in drier regions. This study confirms climate

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Area of Science:

  • Ecology
  • Biogeochemistry
  • Peatland Science

Background:

  • Ecosystem spatial patterning is influenced by multiple mechanisms.
  • Hummock-hollow patterning in peatlands is a key example of ecosystem spatial patterning.
  • Previous models predict differing nutrient distribution mechanisms based on drainage vs. evapotranspiration dominance.

Purpose of the Study:

  • To test predictions of nutrient distribution mechanisms in patterned peatlands across a climatic gradient.
  • To investigate the role of climate in driving hummock-hollow nutrient contrasts.
  • To evaluate existing models of peatland patterning and suggest improvements.

Main Methods:

  • Compared nutrient distributions in patterned peatlands across Scotland, Sweden, and Siberia.
  • Quantified nutrient distribution using resource contrast (hummock-hollow nutrient availability difference).
  • Analyzed data along a climatic gradient from wet, drainage-dominated to drier, evapotranspiration-dominated conditions.

Main Results:

  • Resource contrast showed a clear trend along the climatic gradient.
  • Contrasts were negative to slightly positive in Scotland (wet), positive in Sweden (temperate), and strongly positive in Siberia (continental).
  • Findings support previous models predicting climate-driven shifts in nutrient distribution.

Conclusions:

  • Climate significantly influences the mechanisms driving hummock-hollow patterning in peatlands.
  • Results suggest models should incorporate dissolved/adsorbed nutrient phases and nutrient uptake/storage.
  • Future climate change may alter peatland ecosystem functioning by modifying nutrient redistribution.