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Title: Tropical peatland carbon storage linked to global latitudinal trends in peat recalcitrance

Journal Article · · Nature Communications
ORCiD logo [1];  [2];  [3]; ORCiD logo [2];  [4];  [5];  [5];  [6];  [7];  [8];  [2];  [2];  [9];  [10];  [11];  [11];  [12];  [13]; ORCiD logo [14];  [8] more »;  [8];  [5];  [5] « less
  1. Florida State Univ., Tallahassee, FL (United States); The Ohio State Univ., Columbus, OH (United States)
  2. Duke University Wetland Center, Nicholas School of the Environment, Durham, NC (United States)
  3. University of Potsdam (Germany); National Museum of Natural History, Washington, DC (United States)
  4. Univ. of Minnesota, Minneapolis, MN (United States)
  5. Florida State Univ., Tallahassee, FL (United States)
  6. Singapore-MIT Alliance for Research and Technology (Singapore)
  7. The Ohio State Univ., Columbus, OH (United States)
  8. Lebanese University, Beirut (Lebanon)
  9. Max Planck Institute for Biogeochemistry, Jena (Germany)
  10. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  11. Univ. of Arizona, Tucson, AZ (United States)
  12. McGill Univ., Montreal, QC (Canada)
  13. Univ. of Montreal, Quebec (Canada)
  14. North Carolina State Univ., Raleigh, NC (United States)

Peatlands represent large terrestrial carbon banks. Given that most peat accumulates in boreal regions, where low temperatures and water saturation preserve organic matter, the existence of peat in (sub)tropical regions remains enigmatic. Here we examined peat and plant chemistry across a latitudinal transect from the Arctic to the tropics. Near-surface low-latitude peat has lower carbohydrate and greater aromatic content than near-surface high-latitude peat, creating a reduced oxidation state and resulting recalcitrance. This recalcitrance allows peat to persist in the (sub)tropics despite warm temperatures. Because we observed similar declines in carbohydrate content with depth in high-latitude peat, our data explain recent field-scale deep peat warming experiments in which catotelm (deeper) peat remained stable despite temperature increases up to 9 °C. We suggest that high-latitude deep peat reservoirs may be stabilized in the face of climate change by their ultimately lower carbohydrate and higher aromatic composition, similar to tropical peats.

Research Organization:
Univ. of Arizona, Tucson, AZ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0010580; SC0012272; SC0016440; SC0004632; SC0012088
OSTI ID:
1506113
Journal Information:
Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 107 works
Citation information provided by
Web of Science

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Interactions between labile carbon, temperature and land use regulate carbon dioxide and methane production in tropical peat journal December 2019
Silicon accumulation in rice plant aboveground biomass affects leaf carbon quality journal September 2019
Carbon Chemistry of Intact Versus Chronically Drained Peatlands in the Southeastern USA journal September 2019
Scientists’ warning to humanity: microorganisms and climate change journal June 2019
Constraints on microbial communities, decomposition and methane production in deep peat deposits journal February 2020
Carbon Emissions From Oil Palm Plantations on Peat Soil journal August 2019
Assessing the peatland hummock–hollow classification framework using high-resolution elevation models: implications for appropriate complexity ecosystem modeling journal January 2019
Scientists’ warning to humanity: microorganisms and climate change text January 2019
Anthropogenic and climate signals in late-Holocene peat layers of an ombrotrophic bog in the Styrian Enns valley (Austrian Alps) journal September 2020