| 引用本文: | 赵艺棋,许慎栋,侯玉平,贺阳剑,韩广轩,谢宝华,李欢,宋维民,王晓杰,赵明亮.黄河三角洲典型潮沟区域土壤有机碳含量分布特征与来源解析[J].海洋科学,2025,49(6):1-14. |
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| 黄河三角洲典型潮沟区域土壤有机碳含量分布特征与来源解析 |
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赵艺棋1,2, 许慎栋2,3,4, 侯玉平1, 贺阳剑2,4, 韩广轩2,4, 谢宝华2,4, 李欢3, 宋维民2,4, 王晓杰2,4, 赵明亮2,4
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1.鲁东大学生命科学学院, 山东 烟台 264025;2.中国科学院烟台海岸带研究所/中国科学院海岸带环境过程与生态修复重点实验室/山东省海岸带环境过程重点实验室, 山东 烟台 264003;3.江苏省海岸海洋资源开发与环境安全重点实验室(河海大学), 江苏 南京 210098;4.中国科学院黄河三角洲滨海湿地生态系统野外观测研究站, 山东 东营 257500
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| 摘要: |
| 潮沟是潮滩湿地与海洋进行物质循环和能量交换的重要通道,控制着潮间带系统中水体、养分、沉积物和生物区系的分布。然而,目前针对潮沟区域土壤有机碳来源与分布的研究较少,关于潮沟系统及潮滩发育过程对土壤有机碳埋藏的影响机制认识不足。本研究以黄河三角洲典型潮沟区域为研究对象,分别于低潮滩、中潮滩和高潮滩采集柱状样品。通过分析土壤理化性质、稳定碳同位素(δ13C)和碳氮比值(C/N)等地球化学指标,解析潮滩土壤有机碳的来源、含量与分布特征。结果表明:潮沟土壤总有机碳(Total organic carbon,TOC)含量在0.46~10.38 g/kg,总体呈现由海向陆逐渐增加的趋势。在垂直方向上,TOC含量随深度增加呈现降低趋势。基于稳定碳同位素混合模型(IsoSource)分析,土壤有机碳来源为海洋、陆地和自生植物混合来源,其中海源贡献整体相对较高,平均占比为45%。进一步分析发现,伴随着潮滩的发育与植被的演替,地上生物量与土壤粒度显著影响着有机碳的含量与分布,随着植被地上生物量和土壤黏土比例升高,TOC含量逐渐增加,研究表明,潮沟系统复杂的水文、植被和土壤理化性质显著影响着土壤有机碳的来源分布和埋藏过程。 |
| 关键词: 潮滩湿地 潮沟 土壤有机碳 稳定碳同位素 来源 |
| DOI：10.11759/hykx20250119001 |
| 分类号:X171.1 |
| 基金项目:江苏省海岸海洋资源开发与环境安全重点实验室(河海大学)开放基金资助项目(JSCE202302)；国家重点研发计划项目(2024YFF0-808801)；国家自然科学基金资助项目(42471140) |
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| Characterization of soil organic carbon distribution and source analysis in a typical tidal creek area of the Yellow River Delta |
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ZHAO Yiqi1,2, XU Shendong2,3,4, HOU Yuping1, HE Yangjian2,4, HAN Guangxuan2,4, XIE Baohua2,4, LI Huan3, SONG Weimin2,4, WANG Xiaojie2,4, ZHAO Mingliang2,4
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1.School of Life Science, Ludong University, Yantai 264025, China;2.Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences/Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Chinese Academy of Sciences/Shandong Provincial Key Laboratory of Coastal Environmental Processes, Yantai 264003, China;3.Jiangsu Key Laboratory of Coast Ocean Resources Development and Environmental Security, Hohai University, Nanjing 210098, China;4.Yellow River Delta Field Observation and Research Station of Coastal Wetland Ecosystem, Chinese Academy of Sciences, Dongying 257500, China
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| Abstract: |
| The tidal creek is an important channel for material circulation and energy exchange between tidal flats and the ocean, and it controls the distribution of water, nutrients, sediments, and biota in the intertidal system. However, studies on the source and distribution of soil organic carbon in the tidal creek area are limited. The mechanism underlying the influence of the tidal creek system and tidal flat development process on soil organic carbon burial is unclear. Thus, this study collected six sedimentary columns from low, medium, and high tidal flats in a typical tidal creek of the Yellow River Delta. By analyzing geochemical indicators, including soil physicochemical properties, stable carbon isotopes (δ13C), and carbon/nitrogen ratio (C/N), we ascertained the source, contents, and distribution characteristics of soil organic carbon in tidal flats. The total organic carbon (TOC) content of the tidal flats was 0.46–10.38 g/kg, with a general trend of gradually increasing from low to high tidal flats; TOC content was inversely proportional to the depth. The IsoSource stable isotope mixing model analysis indicated that the soil organic carbon sources were a mixture of marine, terrestrial, and autotrophic plants, in which the overall contribution of marine sources was relatively higher, at an average of 45%. Further analysis revealed that along with the development of mudflats and vegetation succession, aboveground biomass and soil grain size substantially affected the content and distribution of organic carbon. Specifically, the TOC content was directly proportional to the aboveground vegetation biomass and the proportion of soil clay. Our study demonstrates that the complex hydrological, vegetative, and physicochemical soil characteristics of the tidal creek system markedly influence the source, distribution, and sequestration of soil organic carbon. |
| Key words: tidal flats tidal creek soil organic carbon stable carbon isotope source |
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