海洋科学2025，Vol.49Issue(6)：1-14,14.DOI:10.11759/hykx20250119001
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
Characterization of soil organic carbon distribution and source analysis in a typical tidal creek area of the Yellow Riv-er Delta
摘要
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 physico-chemical properties,stable carbon isotopes(δ13C),and carbon/nitrogen ratio(C/N),we ascertained the source,con-tents,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 af-fected 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 hydro-logical,vegetative,and physicochemical soil characteristics of the tidal creek system markedly influence the source,distribution,and sequestration of soil organic carbon.关键词
潮滩湿地/潮沟/土壤有机碳/稳定碳同位素/来源Key words
tidal flats/tidal creek/soil organic carbon/stable carbon isotope/source分类
资源环境引用本文复制引用
赵艺棋,赵明亮,许慎栋,侯玉平,贺阳剑,韩广轩,谢宝华,李欢,宋维民,王晓杰..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):1-14,14.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) （河海大学）
国家重点研发计划项目(2024YFF0-808801) （2024YFF0-808801）
国家自然科学基金资助项目(42471140)Jiangsu Key Laboratory of Coast Ocean Re-sources Development and Environmental Security,Hohai University,No.JSCE202302 （42471140）
the National Key R&D Program of China,No.2024YFF0808801 （）
the National Natural Science Foundation of China,No.42471140 （）
