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A re-evaluation of wetland carbon sink mitigation concepts and measurements: A diagenetic solution

Created 23/06/2025

Updated 23/06/2025

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The capacity of wetlands to mitigate greenhouse gas (GHG) emissions is the sum of two services–the protection of vulnerable organic stocks from remineralisation, and the capacity to sequester GHGs relative to their anthropogenic replacements. Organic carbon accumulation (CA) down through the sediment column is often taken as the measure of sequestration because of its capacity to record long-term variability and trends. However, we demonstrate that: i) CA is not equivalent to sequestration as net ecosystem production (NEP) for open systems; it requires the subtraction of the initial deposition rate of labile allochthonous carbon sources; ii) CA also requires subtraction of intrinsically allochthonous recalcitrants down through the sediment column, and together with subtraction of autochthonous recalcitrants from organic stock services; iii) CA as a climatic mitigation service also requires a diagenetic correction, as the annual deposition of labile organic carbon continues to remineralise over the long-term; and iv) preserving of a wetland has a significantly greater mitigation potential than restoring one. To address the above concerns, a global diagenetic solution is proposed, applied, and tested for a tropical seagrass and mangrove. As expected traditional CA estimates were disproportionately larger than their respective cal. NEPs and together with stocks fell within the ranges reported in the literature, with a final carbon accreditation highly dependent on the choice of their anthropogenic replacements. The review demonstrates that mitigation concepts and measurements for natural carbon sequestration solutions require re-evaluation to avoid GHG emissions above their capacity or reduce the ability to fulfil emission targets.

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Field Value
Title A re-evaluation of wetland carbon sink mitigation concepts and measurements: A diagenetic solution
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/97790a91-3209-40c4-a096-48e5f2c36b5e
Contact Point
Australian Ocean Data Network
JohnBarry.Gallagher@utas.edu.au
Reference Period 01/11/2016 - 01/03/2017
Geospatial Coverage
Map data © OpenStreetMap contributors
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Data Portal Australian Oceans Data Network

Data Source

This dataset was originally found on Australian Oceans Data Network "A re-evaluation of wetland carbon sink mitigation concepts and measurements: A diagenetic solution". Please visit the source to access the original metadata of the dataset:
https://catalogue.aodn.org.au/geonetwork/srv/eng/csw/dataset/a-re-evaluation-of-wetland-carbon-sink-mitigation-concepts-and-measurements-a-diagenetic-soluti