The influence of seagrass traits and environmental controls on soil organic carbon stocks in Chrouy Pros Bay, Cambodia

Seagrass habitats are valued for their ecosystem services, including organic carbon burial and storage, which has generated interest in their conservation as a nature-based solution for climate change mitigation. Globally, there is large variability in the magnitude and controls of seagrass carbon s...

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Vydané v:The Science of the total environment Ročník 993; s. 180000
Hlavní autori: Krause, Johannes R., Chroeng, Chantha, Glue, Matt, Mesa, Lim, Ngoun, Tharamony, Tak, Chandara, Bayley, Daniel T.I., Fourqurean, James W.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Netherlands Elsevier B.V 01.09.2025
Predmet:
Alismatales
Bays
Biomass
Blue carbon
Cambodia
Carbon - analysis
Carbon Sequestration
Ecosystem
Environmental Monitoring
Facilitation
Mangrove
Organic carbon
Provenance
Seagrass
Soil - chemistry
Traits
Cambodia
Facilitation
Blue carbon
Organic carbon
Provenance
Mangrove
Seagrass
Traits
ISSN:0048-9697, 1879-1026, 1879-1026
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Shrnutí:Seagrass habitats are valued for their ecosystem services, including organic carbon burial and storage, which has generated interest in their conservation as a nature-based solution for climate change mitigation. Globally, there is large variability in the magnitude and controls of seagrass carbon storage related to environmental conditions and seagrass traits. Here, we investigated seagrass soil and biomass carbon stocks alongside plant traits at Chrouy Pros Bay in the Gulf of Thailand, to present the first estimates of organic carbon storage in Cambodian seagrass meadows. The organic carbon stocks of 122 ± 52 Mg C ha−1 in the top 1 m of soil are higher than the best available global estimate, and higher than recent regional estimates for other sites dominated by the seagrass Halodule pinifolia (Miki) Hartog. Seagrass traits differed with elevation in the tidal frame, where intertidal seagrasses had higher shoot density but lower biomass per shoot compared to shallow subtidal seagrasses, which undergo leaf etiolation in response to light limitation in this turbid bay. Interestingly, the sparser, subtidal meadows had larger organic carbon stocks than denser intertidal meadows, reflecting environmental conditions more conducive to organic matter burial and/or low remineralization rates. Organic carbon stocks increased with the proportion of allochthonous (mangrove and terrestrial) organic matter, which contributed 56 % to 95 % of organic carbon to seagrass-associated sediments across all sampling sites, highlighting that material fluxes connect the blue carbon ecosystems at this bay. This connectivity suggests that holistic approaches encompassing multiple habitats are needed to effectively manage coastal blue carbon ecosystems. [Display omitted] •First report of Corg stocks in Cambodian seagrasses higher than global estimates•Seagrass traits and carbon stocks differed with elevation in the tidal frame.•Growth form maximized facilitation in intertidal and light attenuation in subtidal•Carbon stocks increased with the proportion of allochthonous organic matter.•Connected blue carbon habitats require holistic management approaches.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2025.180000