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四海龙湾表层沉积物中有机质的组成特征及其源解析

房吉敦 吴丰昌 熊永强 谢文军 谢 彦 赵艳云 杨红军

房吉敦, 吴丰昌, 熊永强, 谢文军, 谢 彦, 赵艳云, 杨红军. 四海龙湾表层沉积物中有机质的组成特征及其源解析[J]. 环境科学研究, 2015, 28(3): 333-339.
引用本文: 房吉敦, 吴丰昌, 熊永强, 谢文军, 谢 彦, 赵艳云, 杨红军. 四海龙湾表层沉积物中有机质的组成特征及其源解析[J]. 环境科学研究, 2015, 28(3): 333-339.
FANG Jidun, WU Fengchang, XIONG Yongqiang, XIE Wenjun, XIE Yan, ZHAO Yanyun, YANG Hongjun. Composition and Source Identification of Organic Matter in Surface Sediments of Lake Sihailongwan, China[J]. Research of Environmental Sciences, 2015, 28(3): 333-339.
Citation: FANG Jidun, WU Fengchang, XIONG Yongqiang, XIE Wenjun, XIE Yan, ZHAO Yanyun, YANG Hongjun. Composition and Source Identification of Organic Matter in Surface Sediments of Lake Sihailongwan, China[J]. Research of Environmental Sciences, 2015, 28(3): 333-339.

四海龙湾表层沉积物中有机质的组成特征及其源解析

基金项目: 山东省自然科学基金项目(ZR2014DM002);山东省高校科技计划项目(J14LD03);滨州学院科研启动经费项目(2013Y14)

Composition and Source Identification of Organic Matter in Surface Sediments of Lake Sihailongwan, China

  • 摘要: 为研究玛珥湖四海龙湾表层沉积物中有机质的组成特征及来源,采集四海龙湾表层沉积物样品,并对其中的有机质进行了分析. 结果表明,四海龙湾表层沉积物中w(TOC)(TOC为总有机碳)为6.7%、w(TN)为0.6%、δ13Corg(TOC同位素丰度)为-28.0‰、δ15Ntotal(TN同位素丰度)为2.2‰. 可溶性有机质主要包括脂肪烃、脂肪醇、脂肪酸和GDGTs(甘油二烷基甘油四醚脂)等,其中脂肪酸是可溶性有机质的主要组分,约占可溶性有机质总量的68.8%,主要来源于内源性的藻类和厌氧菌; 脂肪烃主要来源于陆源的C3木本植物;结合态脂肪醇具有明显的内源来源特征,而游离态脂肪醇却呈现陆源来源特征. 四海龙湾沉积物中含有丰富的GDGTs,主要来源于陆源土壤,包括支链类GDGTs和类异戊二烯类GDGTs,其中类异戊二烯类GDGTs以GDGTⅣ和GDGTⅤ为主,但其在四海龙湾沉积物中的含量相对较小. 研究显示,四海龙湾流域陆源是沉积物中可溶性有机质的主要来源,陆源有机质的大量流入改变了四海龙湾的营养水平;不同种类可溶性有机质表现出不同的来源特征,这主要是由于微生物对不同种类有机质降解速率的不同所致,并且导致降解所产生的二次有机质数量也不同.

     

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