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Global seagrass carbon stock variability and emissions from seagrass loss
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Journal Article
Global seagrass carbon stock variability and emissions from seagrass loss
2025
Overview
Seagrass ecosystems are recognized for their capacity to sequester and store organic carbon, but there is large variability in soil organic carbon stocks associated with plant traits and environmental conditions, making the quantification and scaling of carbon storage and fluxes needed to contribute to climate change mitigation highly challenging. Here, we provide estimates of carbon stocks associated with seagrass systems (biomass and soil) through analyses of a comprehensive global database including 2700+ seagrass soil cores. The median global soil C
org
stock estimate is 24.2 (12.4 – 44.9) Mg C
org
ha
−1
in the top 30 cm of soil, 27% lower than estimates from previous global syntheses, refining the IPCC Tier 1 soil C
org
stock currently used for carbon accounting in places without local data. We estimate that seagrass carbon stocks at risk of degradation could emit 1,154 Tg (665 – 1699) CO
2
with a social cost of $213 billion (2020 US dollars), if no action is taken to conserve these habitats.
Johannes Krause et al. synthesized seagrass carbon stock data from 2700+ soil cores to find that they vary by plant functional group and coastal setting, indicating where conservation efforts would most effectively avoid emissions from seagrass loss
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
