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Thermodynamic control of the carbon budget of a peatland

Worrall, Fred; Moody, Catherine S.; Clay, Gareth D.; Burt, Tim P.; Kettridge, Nicholas; Rose, Rob

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Catherine S. Moody

Gareth D. Clay

Tim P. Burt

Nicholas Kettridge

Rob Rose


The transformations and transitions of organic matter into, through, and out of an ecosystem must obey the second law of thermodynamics. This study considered the transition in the solid components of the organic matter flux through an entire ecosystem. Organic matter samples were taken from each organic matter reservoir and fluvial transfer pathway in a 100% peat‐covered catchment (Moor House National Nature Reserve, North Pennines, UK) and were analyzed by elemental analysis and bomb calorimetry. The samples analyzed were as follows: bulk aboveground and belowground biomass; individual plant functional types (heather, mosses, and sedges); plant litter layer; peat soil; and samples of particulate and dissolved organic matter (POM and DOM). Samples were compared to standards of lignin, cellulose, and plant protein. It was possible to calculate: enthalpy of formation ( urn:x-wiley:21698953:media:jgrg21153:jgrg21153-math-0001); entropy of formation ( urn:x-wiley:21698953:media:jgrg21153:jgrg21153-math-0002); and Gibbs free energy of formation ( urn:x-wiley:21698953:media:jgrg21153:jgrg21153-math-0003) for each of the samples and standards. The increase (decreasing negative values) in urn:x-wiley:21698953:media:jgrg21153:jgrg21153-math-0004 through the ecosystem mean that for all but litter production, the transformations through the system must be balanced by production of low (large negative values) urn:x-wiley:21698953:media:jgrg21153:jgrg21153-math-0005 products, not only CO2 or CH4 but also DOM. The change in urn:x-wiley:21698953:media:jgrg21153:jgrg21153-math-0006 down the peat profile shows that reaction of the soil organic matter decreases or even ceases at depth and the majority of the reaction has occurred above 40 cm below the surface. This approach represents a new objective way to test and trace organic matter transformations in and through an ecosystem.


Worrall, F., Moody, C. S., Clay, G. D., Burt, T. P., Kettridge, N., & Rose, R. (2018). Thermodynamic control of the carbon budget of a peatland. Journal of Geophysical Research: Biogeosciences, 123(6), 1863-1878.

Journal Article Type Article
Acceptance Date May 8, 2018
Online Publication Date May 17, 2018
Publication Date May 17, 2018
Deposit Date Jun 14, 2018
Publicly Available Date Dec 15, 2018
Journal Journal of Geophysical Research: Biogeosciences
Print ISSN 2169-8953
Electronic ISSN 2169-8961
Publisher American Geophysical Union
Peer Reviewed Peer Reviewed
Volume 123
Issue 6
Pages 1863-1878


Published Journal Article (1.6 Mb)

Copyright Statement
Worrall, Fred, Moody, Catherine S., Clay, Gareth D., Burt, Tim P., Kettridge, Nicholas & Rose, Rob (2018). Thermodynamic control of the carbon budget of a peatland. Journal of Geophysical Research: Biogeosciences 123(6): 1863-1878, 10.1029/2017JG003996. To view the published open abstract, go to and enter the DOI.

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