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The effective oxidation state of a peatland.

Worrall, F. and Clay, G.D. and Moody, C.S. and Burt, T.P. and Rose, R. (2016) 'The effective oxidation state of a peatland.', Journal of geophysical research : biogeosciences., 121 (1). pp. 145-158.

Abstract

The oxidative ratio (OR) of the organic matter of the terrestrial biosphere is a key parameter in the understanding of the magnitude of the carbon sink represented both by the terrestrial biosphere and by the global oceans. However, no study has considered the oxidation state of all the organic pools and fluxes within one environment. In this study all organic matter pathways (dissolved organic matter, particulate organic matter, CO2, and CH4) were measured within an upland peat ecosystem in northern England. The study showed the following: (1) The peat soil of ecosystem was accumulating oxygen at a rate of between −16 and −73 t O km−2 yr−1; (2) Although there was no significant variation in oxidation state in the peat profile, there was a significant increase in degree of unsaturation with depth; (3) The dissolved organic matter leaving the ecosystem was significantly more oxidized than the other carbon pools analyzed while the particulate organic matter was not significantly different from the peat soil profile; and (4) Assuming that all carbon flux from the site was as CO2, the OR of the ecosystem was 1.07; when the nature and speciation of the release pathways were considered, the ecosystem OR was 1.04. At the global scale, correcting for the speciation of carbon fluxes means that the annual global fluxes of carbon to land = 1.49 ± 0.003 Gt C/yr and to the oceans = 2.01 ± 0.004 Gt C/yr.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1002/2015jg003182
Publisher statement:Worrall, F., G. D. Clay, C. S. Moody, T. P. Burt, and R. Rose (2016), The effective oxidation state of a peatland, Journal of Geophysical Research: Biogeosciences, 121(1), 145–158, 10.1002/2015jg003182 (DOI). To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Date accepted:12 December 2015
Date deposited:03 May 2016
Date of first online publication:15 January 2016
Date first made open access:15 July 2016

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