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余宿中,任春华,姜发军,许剑峰,秦洲,陈廷,江晓,胡超群.马尾藻生长对近岸海域DOM分子组成的影响及其碳汇意义[J].广西科学,2026,33(2):375-382. [点击复制]
- YU Suzhong,REN Chunhua,JIANG Fajun,XU Jianfeng,QIN Zhou,CHEN Ting,JIANG Xiao,HU Chaoqun.Impact of Sargassum spp.Growth on the Molecular Composition of DOM in Coastal Waters and Its Implications for Carbon Sink[J].Guangxi Sciences,2026,33(2):375-382. [点击复制]
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| 马尾藻生长对近岸海域DOM分子组成的影响及其碳汇意义 |
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余宿中1,2, 任春华1, 姜发军3, 许剑峰1,2, 秦洲1,2, 陈廷1, 江晓1, 胡超群1
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| (1.中国科学院南海海洋研究所, 热带海洋生物资源与生态实验室, 广东广州 510301;2.中国科学院大学海洋学院, 北京 100049;3.广西科学院, 广西海洋科学院(广西红树林研究中心), 广西近海海洋环境科学重点实验室, 广西南宁 530007) |
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| 摘要: |
| 马尾藻(Sargassum spp.)生长对近岸海域的碳汇过程具有重要影响，但其对碳汇功能的调控机制尚不明确。本研究在涠洲岛马尾藻海域和无藻海域(作对照)设置监测站位，结合傅里叶变换离子回旋共振质谱和三维荧光光谱技术，系统解析了马尾藻生长对近岸海域溶解性有机质(Dissolved Organic Matter，DOM)分子种类、元素组成及其荧光特征的影响。结果表明，马尾藻海域新增DOM分子数整体上高于无藻海域，其DOM分子类别随马尾藻生长阶段呈现明显的动态演变特征。同时，荧光指数(FI)也表明马尾藻经历“生长释放—衰败转化”的动态周期：生长旺盛期，藻体代谢活跃，释放大量活性生物源组分，马尾藻海域类色氨酸荧光强度升高，生物源指数(BIX)较初期提升30.68%；衰败期，微生物介导的转化作用增强，马尾藻海域腐殖化指数(HIX)上升，难降解组分积累。与无藻海域相比，马尾藻海域表现出更强的主动碳汇潜力。马尾藻持续释放化学成分多样的DOM，驱动微生物碳泵将其向惰性溶解有机质(rDOM)转化，从而在生源要素周转与有机碳固存之间建立了动态平衡。本研究从分子水平揭示了大型藻类生境在海洋碳封存中的关键作用，为评估近岸蓝碳生态系统功能提供了新的科学依据。 |
| 关键词: 马尾藻 溶解性有机质(DOM) 分子成分 碳汇 |
| DOI：10.13656/j.cnki.gxkx.20260603.015 |
| 投稿时间：2026-01-19修订日期：2026-03-19 |
| 基金项目:国家重点研发计划项目“海洋牧场生态系统演变过程与固碳增汇途径”(2022YFD2401301)和广西科学院创新团队启动资助项目(CQ-C-202301)资助。 |
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| Impact of Sargassum spp.Growth on the Molecular Composition of DOM in Coastal Waters and Its Implications for Carbon Sink |
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YU Suzhong1,2, REN Chunhua1, JIANG Fajun3, XU Jianfeng1,2, QIN Zhou1,2, CHEN Ting1, JIANG Xiao1, HU Chaoqun1
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| (1.Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, Guangdong, 510301, China;2.College of Marine Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China;3.Guangxi Key Laboratory of Marine Environmental Science, Guangxi Academy of Marine Sciences (Guangxi Mangrove Research Center), Guangxi Academy of Sciences, Nanning, Guangxi, 530007, China) |
| Abstract: |
| The growth of Sargassum spp.significantly influences carbon sequestration processes in coastal water.However,the mechanisms regulating their carbon sink function remain unclear.In this study,monitoring stations were established in a Sargassum spp.-covered sea area and an algae-free sea area (as control) around Weizhou Island.By integrating fourier transform ion cyclotron resonance mass spectrometry and three-dimensional excitation-emission matrix fluorescence spectroscopy,this study systematically analyzed the effects of Sargassum spp. growth on the compound diversity,element composition,and fluorescence characteristics of Dissolved Organic Matter (DOM).The results showed that the number of newly added DOM molecules in the Sargassum spp.-covered sea area was generally higher than that in the algae-free sea area.The categories of DOM molecules showed obvious dynamic evolution characteristics as Sargassum spp.grew at different stages.The Fluorescence Index (FI) indicated that Sargassum spp.underwent a dynamic cycle of “growth release-decay transformation”.During the peak growth stage,algae showed intensified metabolic activity,releasing substantial bioactive components.Consequently,the tryptophan-like fluorescence intensity increased in the Sargassum spp.-covered sea area,with the Biological Index (BIX) rising by 30.68% compared with that at the initial stage.During the decay stage,microbially mediated transformation intensified,leading to an elevated Humification Index (HIX) and the accumulation of refractory components in the Sargassum spp.-covered sea area.Compared with the algae-free sea area,the Sargassum spp.-covered seas area exhibited enhanced active carbon sink potential.The chemically diverse DOM continuously released by Sargassum spp. drove the microbial carbon pump to convert it into recalcitrant Dissolved Organic Matter (rDOM),thereby establishing a dynamic balance between biogenic element turnover and organic carbon sink.This study reveals the critical role of macroalgae in marine carbon sink at the molecular level,providing a scientific basis for assessing the functions of coastal blue carbon ecosystems. |
| Key words: Sargassum spp. Dissolved Organic Matter (DOM) molecular composition carbon sink |
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