| 引用本文： |
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骆丽珍,耿晓晓,庞巧珠,陈丹丹.八门湾潟湖沉积物有机碳、总氮和叶绿素a的分布及埋藏特征分析[J].广西科学,2026,33(2):420-429. [点击复制]
- LUO Lizhen,GENG Xiaoxiao,PANG Qiaozhu,CHEN Dandan.Distribution and Burial Characteristics of Organic Carbon,Total Nitrogen,and Chlorophyll a in Sediments of the Bamenwan Lagoon[J].Guangxi Sciences,2026,33(2):420-429. [点击复制]
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| 摘要: |
| 为揭示海南文昌八门湾潟湖沉积物有机质相关指标的空间分布特征及垂向变化规律，本研究分析了8个代表性站位0—20 cm沉积剖面中总有机碳(TOC)、总氮(TN)、叶绿素a(Chl-a)含量及碳氮比(C/N)的分布特征，并采用Spearman秩相关性分析探讨各指标之间的相关关系。结果表明，TOC、TN和Chl-a在站位间及沉积剖面内均表现出显著的空间异质性，且表层(0—6 cm)沉积物的空间差异较为突出，中深层(>6 cm)则相对减弱，反映出表层沉积物对近期环境输入与水动力过程的灵敏响应。多数站位中TOC与TN在剖面内变化较为一致，表明二者具有协同变化特征。相比之下，Chl-a呈现明显的表层富集和随深度增加而递减的垂直分布特征，说明藻源色素信号主要集中于表层沉积物。TN、Chl-a与C/N之间呈现出截然不同的相关关系，指示不同层位有机质来源与保存状态的差异。在空间分布上，TOC、TN与Chl-a的高值区集中于潟湖里端及中央航道附近，表明该区域可能具有较强的有机质和氮素汇聚特征。本研究阐明了八门湾潟湖沉积物有机质的源—汇动态，为近岸碳汇增汇研究及生态风险管控提供了科学依据。 |
| 关键词: 八门湾潟湖 沉积物 有机碳 总氮 叶绿素a |
| DOI：10.13656/j.cnki.gxkx.20260603.020 |
| 投稿时间：2026-01-12修订日期：2026-03-03 |
| 基金项目:海南省重点研发项目(ZDYF2025SHFZ037)和自然资源部2024年度部省合作项目(2024ZRBSHZ102)资助。 |
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| Distribution and Burial Characteristics of Organic Carbon,Total Nitrogen,and Chlorophyll a in Sediments of the Bamenwan Lagoon |
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LUO Lizhen1, GENG Xiaoxiao1,2, PANG Qiaozhu1, CHEN Dandan1
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| (1.Hainan Academy of Ocean and Fisheries Sciences, Haikou, Hainan, 570125, China;2.School of Ecology, Hainan University, Haikou, Hainan, 570100, China) |
| Abstract: |
| To characterize the spatial distribution and vertical profiles of organic matter and nutrients in the sediments of the Bamenwan Lagoon (Wenchang,Hainan Island),this study quantified the Total Organic Carbon (TOC),Total Nitrogen (TN),Chlorophyll-a (Chl-a),and the carbon-to-nitrogen (C/N) ratio in 0—20 cm sediment cores collected from eight representative stations.Spearman rank correlation analysis was performed to examine the relationships among these indicators.The results showed pronounced spatial heterogeneity in TOC,TN,and Chl-a among stations and within sediment profiles.Inter-station differences were the strongest in surface sediments(0-6 cm)and weakened at greater depths (>6 cm),indicating that surface layers responded more sensitively to recent environmental inputs and depositional dynamics.The vertical profiles of TOC and TN were highly consistent at most stations,suggesting a coupled variation pattern between them.Chl-a displayed a clear stratified pattern with the concentration decreasing with the increase in depth,suggesting that pigment signals were mainly concentrated in shallow sediments.The complex correlation structures among TN,Chl-a,and C/N ratio at certain stations further impled depth-dependent differences in organic-matter sources and preservation states.Spatially,elevated TOC,TN,and Chl-a were concentrated in the inner lagoon and near the central navigation channel,which confirmed that this area may act as important zones of organic matter and nitrogen accumulation.Overall,this study elucidates the source-sink dynamics of organic matter in lagoon sediments,providing scientific support for the research on enhancing coastal carbon sinks and the ecological risk management. |
| Key words: Bamenwan Lagoon sediment organic carbon total nitrogen Chlorophyll-a |
