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Inorganic and black carbon hotspots constrain blue carbon mitigation services across tropical seagrass and temperate tidal marshes

Citation

Gallagher, JB and Prahalad, V and Aalders, J, Inorganic and black carbon hotspots constrain blue carbon mitigation services across tropical seagrass and temperate tidal marshes, Wetlands, 41 Article 65. ISSN 0277-5212 (2021) [Refereed Article]

Copyright Statement

Copyright Society of Wetland Scientists 2021

DOI: doi:10.1007/s13157-021-01460-3

Abstract

Total organic carbon (TOC) sediment stocks as a CO2 mitigation service require exclusion of allochthonous black (BC) and particulate inorganic carbon corrected for water–atmospheric equilibrium (PICeq). For the first time, we address this bias for a temperate salt marsh and a coastal tropical seagrass in BC hotspots that represent two different blue carbon ecosystems of Malaysia and Australia. Seagrass TOC stocks were similar to the salt marshes with soil depths < 1 m (59.3 ± 11.3 and 74.9 ± 18.9 MgC ha− 1, CI 95 % respectively). Both ecosystems showed larger BC constraints than did their pristine counterparts. However, the seagrass meadows’ mitigation services were largely constrained by both higher BC/TOC and PICeq/TOC fractions (38.0 % ± 6.6 and 43.4 % ± 5.9 %, CI 95 %) and salt marshes around a third (22 % ± 10.2 and 6.0 % ± 3.1 % CI 95 %). The results provide useful data from underrepresented regions, and, reiterates the need to consider both BC and PIC for more reliable blue carbon mitigation assessments to ensure that greenhouse gas emitters do not exceed the ecosystems’ capacity.

Item Details

Item Type:Refereed Article
Keywords:seagrass, saltmarsh, blue carbon, black carbon, inorganic carbon, pyrogenic carbon, particulate inorganic carbon, carbon sequestration, Tasmania, Southeast Asia
Research Division:Environmental Sciences
Research Group:Climate change impacts and adaptation
Research Field:Carbon sequestration science
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Mitigation of climate change
Objective Field:Climate change mitigation strategies
UTAS Author:Gallagher, JB (Dr John Barry Gallagher)
UTAS Author:Prahalad, V (Dr Vishnu Prahalad)
UTAS Author:Aalders, J (Mr John Aalders)
ID Code:144654
Year Published:2021
Deposited By:Oceans and Cryosphere
Deposited On:2021-06-02
Last Modified:2021-10-14
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