| 摘要: |
| 牡蛎礁是蓝色碳汇的重要组成部分,其通过钙化作用、生物同化作用以及生物沉积作用等来完成对碳的封存,以达到碳中和的目的。目前我国关于热带天然牡蛎礁碳库储量的研究较少,因此评估了海南岛近岸4处典型天然牡蛎礁(文昌龙楼、文昌会文、昌江昌化和儋州海头)的碳库储量,并分析了其时空变化特征及其原因。结果表明,海头、昌化、龙楼和会文的碳库储量及单位面积平均碳库储量分别为15923.42 tC(3.46 kg.m-2)、2119.01tC(6.09 kg.m-2)、龙楼494.53 tC(2.49 kg.m-2)和会文197.63 tC(3.67 kg.m-2),4处礁区的总碳库储量为18734.6 tC。海头和昌化牡蛎礁单位面积碳库储量可能受到温度变化影响,在7月和12月出现下降趋势,而在水温适宜的10月和2月,牡蛎快速生长,同时带动单位面积碳库储量的上升,值得注意的是牡蛎的繁殖可能是10月份单位面积碳库储量上升的另一重要因素。龙楼地区的牡蛎礁长期受到剧烈的海浪冲刷,将部分牡蛎遗壳固定的碳带至海底进行封存,进而导致牡蛎礁上的单位面积碳库储量在6至12月一直处于下降水平。在养殖活动频繁的会文地区,礁区水质可能出现恶化,导致牡蛎礁在22年7月、10月和23年2月出现牡蛎种群下降。研究表明,海南岛近岸牡蛎礁是我国热带海域潜在的碳储存库,其碳储量受温度及周边养殖活动的影响较大,应加强保护与监测,使其有效发挥碳汇功能,同时其碳汇价值也值得进一步深入评估。 |
| 关键词: 碳汇 热带牡蛎礁 生物固碳 囊牡蛎 |
| DOI：10.11693/hyhz20231200273 |
| 分类号: |
| 基金项目:国家重点研发计划课题2022YFD2401305, 2019YFD0901304 |
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| Assessment of total carbon pool storage and changes of typical oyster reefs in the east and west coasts of Hainan Island |
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Shi Kai1,2, Xiao Yu-Lin1,2, Sun Chun-Yang3,4,5, Xu Qiang1,2, Jia Cheng-Hao3,4,5, Wang Yuan-Hang1,2, Wang Ai-Min1,2
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1.School of Marine Biology and Fisheries;2.Hainan UniversityState Key Laboratory of Marine Resource Utilization in South China Sea;3.School of ecology and environment;4.Hainan University;5.State Key Laboratory of Marine Resource Utilization in South China Sea
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| Abstract: |
| Oyster reef is an important component of blue carbon sink, which completes carbon sequestration through calcification, biological assimilation and biological deposition to achieve the purpose of carbon neutralization. At present, there are few studies on carbon pool reserves of tropical natural oyster reefs in China. Therefore, this study evaluated carbon pool reserves of four typical natural oyster reefs (Wenchang Longlou, Wenchang Huiwen, Changjiang Changhua and Danzhou Haitou) offshore Hainan Island, and analyzed their temporal and spatial variation characteristics and their causes. The results show that the carbon pool reserves and average carbon pool reserves per unit area in Haitou, Changhua, Longlou and Huiwen are 15923.42 tC (3.46 kg.m-2), 2119.01 tC (6.09 kg.m-2), 494.53 tC (2.49 kg.m-2) in Longlou and 197.63 tC (3.67 kg.m-2) in Huiwen, respectively. The total carbon pool reserves in the four reef areas are 18734.6 tC. The carbon storage per unit area of Haitou and Changhua oyster reefs may be affected by temperature changes, and the carbon storage per unit area decreases in July and December. However, in October and February, when the temperature is suitable, the oyster grows rapidly, and at the same time, the carbon storage per unit area increases. It is worth noting that the oyster reproduction may be another important factor for the carbon storage per unit area to increase in October. The oyster reef in Longlou area was washed by severe ocean waves for a long time, which sealed some carbon bands fixed by oyster shells to the seabed, and then caused the carbon storage per unit area on the oyster reef to decrease from June to December. In the Huiwen area where aquaculture activities are frequent, the reef water quality may deteriorate, resulting in the decline of oyster population in July, October and February of 2022. The results show that the oyster reef is a potential carbon reservoir in tropical waters of China, and its carbon storage is greatly affected by temperature and surrounding aquaculture activities. Therefore, it should be protected and monitored to make it play its role as a carbon sink effectively, and its carbon sink value deserves further evaluation. |
| Key words: carbon sink tropical oyster reef biological carbon sequestration Saccostra. |