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.
PeerJ. 2024 Oct 8;12:e18087. doi: 10.7717/peerj.18087. eCollection 2024.
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 and CH emissions and carbon metabolism were studied at a tropical seagrass meadow under various conditions.
CO and CH 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 , , 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).
Seagrass meadows at Koh Mook exhibited varying CO and CH emissions across different sampling areas. CO emissions were higher in patchy compared to patchy and bare sand areas. CH emissions were only detected in vegetated areas (patchy and ) 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 . This study provided baseline information for estimating GHG emissions in seagrass meadows in Thailand.
由于海草床能够在沉积物中储存大量碳，因此它们是重要的蓝色碳汇。然而，全球海草床温室气体（GHG）排放的知识有限，尤其是热带地区的海草床。因此，在这项研究中，在泰国西南海岸外的阁骨岛，研究了各种条件下热带海草床的 CO 和 CH 排放和碳代谢。
使用底栖室在阁骨岛进行了 18 小时的测量，以测量 CO 和 CH 排放和碳代谢。在 18 小时的孵育期内，分三次从斑块状、和裸沙三个区域采集样品：下午 6 点低潮时（t0）、早上 6 点低潮时（t1）和中午涨潮时（t2）。
阁骨岛的海草床在不同的采样区域表现出不同的 CO 和 CH 排放。与斑块状和裸沙区相比，斑块状区的 CO 排放较高。CH 排放仅在植被区（斑块状和）检测到，在裸沙区则不存在。此外，尽管海草床通常被认为是自养的，但不同采样区域的净群落生产力没有显著差异。阁骨岛海草床对温室气体排放的贡献微乎其微。结果表明，阁骨岛海草床的低温室气体排放并没有削弱其作为重要碳汇的作用，其碳汇价值为 320 t CO。本研究为估算泰国海草床温室气体排放提供了基线信息。
