A re-evaluation of wetland carbon sink mitigation concepts and measurements: A diagenetic solution
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.
Simple
Identification info
- Date (Creation)
- 2021-09-14
- Citation identifier
-
https://doi.org/10.25959/NNHB-T463
- Title
- Information and documentation - Digital object identifier system
- Date (Publication)
- 2021-11-29T00:00:00
- Citation identifier
-
ISO 26324:2012
Principal investigator
- Status
- complete
Principal investigator
Extent
Temporal extent
- Time period
- 2016-11-01 2017-03-01
- Maintenance and update frequency
- none-planned
Resource format
- Date
- Keywords (Theme)
-
- Blue carbon
- Teal carbon
- Net ecosystem production
- Carbon accumulation
- Allochthonous recalcitrants
- NASA/GCMD Keywords, Version 8.5
Resource constraints
- Classification
- Unclassified
Resource constraints
- Use limitation
- The data described in this record are the intellectual property of the University of Tasmania through the Institute for Marine and Antarctic Studies.
Resource constraints
- Linkage
-
http://i.creativecommons.org/l/by/4.0/88x31.png
License Graphic
- Title
- Creative Commons Attribution 4.0 International License
- Website
-
http://creativecommons.org/licenses/by/4.0
License Text
- Other constraints
- Cite data as: Gallagher, J.B. (2021). A re-evaluation of wetland carbon sink concepts and measurements: A diagenetic solution down sediments. Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS). https://doi.org/10.25959/NNHB-T463
- Language
- English
- Character encoding
- UTF8
- Supplemental Information
- 10.1071/mf19119 10.1016/j.ecss.2004.04.015
Distribution Information
- Distribution format
-
-
Microsoft Excel
-
Microsoft Excel
- OnLine resource
-
DATA ACCESS - Supplementary Info S1 [model description]
- OnLine resource
-
DATA ACCESS - Supplementary Info S2
- OnLine resource
-
DATA ACCESS - Supplementary Info S3
Resource lineage
- Statement
- Sediment cores, carbon and nitrogen contents and their stable isotope ratios, and 210Pb and 137Cs geochronology
- Hierarchy level
- Dataset
Metadata
- Metadata identifier
-
050291b3-e5a8-4ca8-9ed5-c02b98dc28a1
- Language
- English
- Character encoding
- UTF8
Point of contact
Type of resource
- Resource scope
- Dataset
- Metadata linkage
-
https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/050291b3-e5a8-4ca8-9ed5-c02b98dc28a1
Point of truth URL of this metadata record
- Date info (Creation)
- 2015-05-06T11:44:25
- Date info (Revision)
- 2015-05-06T11:44:25
Metadata standard
- Title
- ISO 19115-3:2018