Sulfur constraints on the carbon cycle of a blanket bog peatland

Boothroyd, I.M.; Worrall, F.; Moody, C.S.; Clay, G.D.; Abbott, G.D.; Rose, R.. 2021 Sulfur constraints on the carbon cycle of a blanket bog peatland. Journal of Geophysical Research: Biogeosciences, 126 (8), e2021JG006435. 20, pp. https://doi.org/10.1029/2021JG006435

Before downloading, please read NORA policies.

Preview

Text
© 2021. American Geophysical Union. All Rights Reserved.
N531197JA.pdf - Published Version
Download (1MB) | Preview

Official URL: https://doi.org/10.1029/2021JG006435

Abstract/Summary

The reduction of sulfate (SO42−) represents an alternative terminal electron acceptor for the oxidation of organic matter in peat soils. The greenhouse gas budget in peatlands will be constrained by how much a peatland can utilize SO42− reduction as an alternative to methanogenesis. Using records of atmospheric deposition and stream chemistry coupled with elemental analysis of peat soil, vegetation, particulate organic matter (POM) and dissolved organic matter (DOM), this study estimated a 23-years long sulfur (S) budget for a blanket bog-covered catchment in the North Pennines, England. The study showed that: (a) Atmospheric deposition of total S significantly declined over the study period from 2.4 to 0.5 t S/km2/yr. (b) Long term accumulation of S into deep peat at 1 m depth averaged 127 kg S/km2/yr. (c) Total S fluvial flux peaked as 4.5 t S/km2/yr with an average of 0.7 t S/km2/yr. (d) On average, over 23 years, 0.25 t S/km2/yr were reduced to either mineral sulphides or hydrogen sulphide; however, in eight out of the 23 years the catchment was a net producer of S to the streams of the catchment. At maximum observed, S reduction capacity the peatland was capable of a net removal of 71% of atmospheric S deposition. Allowing for the efficiency of energy transfer in the redox process and the oxidation state of peat organic matter means that for every mole of SO42− reduced, 1.69 moles of CO2 were produced, and an average of 0.47 t C/km2/yr are diverted from methanogenesis.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2021JG006435
UKCEH and CEH Sections/Science Areas:	Unaffiliated
ISSN:	2169-8953
Additional Keywords:	atmospheric deposition, fluvial flux, greenhouse gases
NORA Subject Terms:	Ecology and Environment
Date made live:	06 Oct 2021 16:05 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/531197

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1029/2021JG006435

UKCEH and CEH Sections/Science Areas:

Unaffiliated

ISSN:

2169-8953

Additional Keywords:

atmospheric deposition, fluvial flux, greenhouse gases

NORA Subject Terms:

Ecology and Environment