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

Gallagher, JB, Prahalad, V ORCID: 0000-0002-3547-616X and Aalders, J ORCID: 0000-0002-9786-4811 2021 , 'Inorganic and black carbon hotspots constrain blue carbon mitigation services across tropical seagrass and temperate tidal marshes' , Wetlands, vol. 41 , pp. 1-13 , doi: 10.1007/s13157-021-01460-3.

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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, 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 Type: Article
Authors/Creators:Gallagher, JB and Prahalad, V and Aalders, J
Keywords: seagrass, saltmarsh, blue carbon, black carbon, inorganic carbon, pyrogenic carbon, particulate inorganic carbon, carbon sequestration, Tasmania, Southeast Asia
Journal or Publication Title: Wetlands
Publisher: Soc Wetland Scientists
ISSN: 0277-5212
DOI / ID Number: 10.1007/s13157-021-01460-3
Copyright Information:

Copyright Society of Wetland Scientists 2021

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