Organic Matter Chemistry Drives Carbon Dioxide Production of Peatlands

A. E. Normand, B. L. Turner, L. J. Lamit, A. N. Smith, B. Baiser, M. W. Clark, C. Hazlett, E. S. Kane, E. Lilleskov, J. R. Long, S. P. Grover, K. R. Reddy

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Peatlands play a critical role in the global carbon (C) cycle, encompassing ∼30% of the 1,500 Pg of C stored in soils worldwide. However, this C is vulnerable to climate and land-use change. Ecosystem models predict the impact of perturbation on C fluxes based on soil C pools, yet responses could vary markedly depending on soil organic matter (SOM) chemistry. Here, we show that one SOM functional group responds strongly to environmental factors and predicts the risk of carbon dioxide (CO2) release from peatlands. The molecular composition of SOM in 125 peatlands differed markedly at the global scale due to variation in temperature, land-use, vegetation, and nutrient status. Despite this variation, incubation of peat from a subset of 11 sites revealed that O-alkyl C (i.e., carbohydrates) was the strongest predictor of aerobic CO2 production. This explicit link provides a simple parameter that can improve models of peatland CO2 fluxes.

Original languageEnglish (US)
Article numbere2021GL093392
JournalGeophysical Research Letters
Volume48
Issue number18
DOIs
StatePublished - Sep 20 2021

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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