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

Published

Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Hodgkins, SB; Richardson, CJ; Dommain, R; Wang, H; Glaser, PH; Verbeke, B; Winkler, BR; Cobb, AR; Rich, VI; Missilmani, M; Flanagan, N; Ho, M; Hoyt, AM; Harvey, CF; Vining, SR; Hough, MA; Moore, TR; Richard, PJH; De La Cruz, FB; Toufaily, J; Hamdan, R; Cooper, WT; Chanton, JP

Published Date

  • September 7, 2018

Published In

Volume / Issue

  • 9 / 1

Start / End Page

  • 3640 -

PubMed ID

  • 30194308

Pubmed Central ID

  • 30194308

Electronic International Standard Serial Number (EISSN)

  • 2041-1723

International Standard Serial Number (ISSN)

  • 2041-1723

Digital Object Identifier (DOI)

  • 10.1038/s41467-018-06050-2

Language

  • eng