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| 海南儋州湾红树林区沉积有机质来源及碳储量 |
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褚梦凡1,2, 肖晓彤1,2, 丁杨1,2, 赵美训1,2
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1.深海圈层与地球系统前沿科学中心和海洋化学理论与工程技术教育部重点实验室, 中国海洋大学, 山东 青岛 266100;2.青岛海洋科学与技术试点国家实验室 海洋生态与环境科学功能实验室, 山东 青岛 266237
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| 摘要: |
| 本文测定了海南儋州湾南岸柱状沉积物的粒度、总有机质参数（TOC、C/N和δ13C）和类脂生物标志物含量，并通过端元混合模型使用红树植物特征标志物蒲公英萜醇含量、长链正构烷烃含量和δ13C值半定量区分了海南儋州湾南岸沉积有机质来源，尤其是红树林的贡献。另外，通过估算沉积物的有机碳储量来评估儋州湾红树林区域的储碳能力。在沉积有机质中，陆源、水源和红树植物有机质所占平均比例分别为47%，36%和17%。沉积物柱状样中单位厘米深度沉积物的碳储量范围在0.12~2.90 t/ha。本研究表明，儋州湾地区沉积物中来自于红树林的有机质比例较低，且其碳埋藏量可能低于全球平均水平。修复和保护儋州湾红树林，能够有效提升湿地的碳埋藏效率，从而减缓大气CO2上升对环境的负面影响。本文应用生物标志物和碳同位素方法，半定量区分了红树林生态系统各种来源有机碳的贡献，将蒲公英萜醇作为红树林特征生物标志物应用在计算模型中，能够量化红树植物来源有机碳的贡献，加深对红树林系统有机碳埋藏情况的了解。 |
| 关键词: 生物标志物 沉积有机质来源 碳储量 红树林 儋州湾 |
| DOI：10.11759/hykx20200215001 |
| 分类号:P734.5 |
| 基金项目:国家自然科学基金项目（U1706219）；山东省重大科技创新工程专项（2018SDKJ0504-1） |
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| Sediment organic matter sources and carbon stock associated with a mangrove reserve in Danzhou Bay, Hainan, China |
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CHU Meng-fan1,2, XIAO Xiao-tong1,2, DING Yang1,2, ZHAO Mei-xun1,2
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1.Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;2.Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China
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| Abstract: |
| The average grain size, total organic carbon concentration, stable carbon isotope content (δ13C), and lipid biomarker concentration were measured in a 40-cm-long sediment core collected from southern Danzhou Bay, Hainan Province, China. The mixing model was used to semiquantitatively estimate the organic matter (OM) from different sources, particularly those from mangroves. Furthermore, the carbon stock in the sediments was estimated to evaluate the carbon sink capacity. Our results showed that the terrestrial, aquatic, and mangrove OM were on average 47%, 36%, and 17% in sediments, respectively. The carbon stock per cm in sediments was 0.12-2.90 t/ha. The results of this study indicated that the proportion of mangrove sedimentary OM was low in southern Danzhou Bay and that the carbon sequestration rate was lower than the global average. Therefore, mangrove protection and restoration in Danzhou Bay can potentially increase the carbon sequestration rate in wetlands, reducing the negative effect of the increasing CO2 concentration on the environment. The biomarker and carbon isotope approach used in this study can be applied to semiquantitatively estimate the sources of OM in tropical estuarine and coastal sediments. The usage of taraxerol as a mangrove-specific biomarker is a practical method to quantify the mangrove-derived OM, improving the understanding of OM burial in mangrove systems. |
| Key words: biomarkers organic matter source carbon stock mangroves Danzhou Bay |