A preliminary study of carbon dioxide and methane emissions from patchy tropical seagrass meadows in Thailand.

Autor: Halim M; Division of Biological Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand., Stankovic M; Excellence Center for Biodiversity of Peninsular Thailand, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand.; Dugong and Seagrass Research Station, Prince of Songkla University, Hat Yai, Songkhla, Thailand., Prathep A; Division of Biological Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand.; Excellence Center for Biodiversity of Peninsular Thailand, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
Jazyk: angličtina
Zdroj: PeerJ [PeerJ] 2024 Oct 08; Vol. 12, pp. e18087. Date of Electronic Publication: 2024 Oct 08 (Print Publication: 2024).
DOI: 10.7717/peerj.18087
Abstrakt: Background: Seagrass meadows are a significant blue carbon sink due to their ability to store large amounts of carbon within sediment. However, the knowledge of global greenhouse gas (GHG) emissions from seagrass meadows is limited, especially from meadows in the tropical region. Therefore, in this study, CO 2 and CH 4 emissions and carbon metabolism were studied at a tropical seagrass meadow under various conditions.
Methods: CO 2 and CH 4 emissions and carbon metabolism were measured using benthic chambers deployed for 18 h at Koh Mook, off the southwest coast of Thailand. The samples were collected from areas of patchy Enhalus acoroides , Thalassia hemprichii , and bare sand three times within 18 h periods of incubation: at low tide at 6 pm (t0), at low tide at 6 am (t1), and at high tide at noon (t2).
Results: Seagrass meadows at Koh Mook exhibited varying CO 2 and CH 4 emissions across different sampling areas. CO 2 emissions were higher in patchy E. acoroides compared to patchy T. hemprichii and bare sand areas. CH 4 emissions were only detected in vegetated areas (patchy E. acoroides and T. hemprichii ) and were absent in bare sand. Furthermore, there were no significant differences in net community production across sampling areas, although seagrass meadows were generally considered autotrophic. Koh Mook seagrass meadows contribute only slightly to GHG emissions. The results suggested that the low GHG emissions from Koh Mook seagrass meadows do not outweigh their role as significant carbon sinks, with a value 320 t CO 2 -eq . This study provided baseline information for estimating GHG emissions in seagrass meadows in Thailand.
Competing Interests: The authors declare that they have no competing interests.
(© 2024 Halim et al.)
Databáze: MEDLINE
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