莱州湾-龙口湾表层沉积物有机质特征及来源分析
发布时间：2018-07-26 07:20
【摘要】：通过对莱州湾-龙口湾表层沉积物样品中总有机碳(TOC)、总氮(TN)、有机碳与总氮的比值(C/N)、稳定碳氮同位素(δ13C、δ15N)生物地球化学指标的测定,分析了该区域沉积物中有机质的特征和来源.结果显示,莱州湾表层沉积物中TOC含量为0.47%±0.40%,龙口湾TOC含量为0.82%±0.37%,TN含量相差不大,因此龙口湾沉积物有机质相对含量高于莱州湾.港口的建设使龙口湾内水体流速减慢,加上龙口湾入海河流较少,使得龙口湾沉积物平均粒径(19.40μm)远低于莱州湾(43.89μm),比较容易吸附有机质.莱州湾沉积物中δ13C值为-24.96‰—21.46‰,平均值为-23.63‰;龙口湾表层沉积物中δ13C值为-23.02‰—22.39‰,平均值为-22.73‰.由此看来,莱州湾沉积物中有机质主要来源于陆生C3植物和藻类,而龙口湾有机质大部分来源于藻类,少数来自陆生C3植物.根据经典的二元模式计算,龙口湾陆源有机质的贡献比例范围为23.15%—33.67%,平均值为28.84%,莱州湾陆源贡献比例范围为7.65%—65.97%,平均值为43.75%.莱州湾沿岸有众多河流入海,尤其是含沙量最多的黄河,给湾内带来大量的陆上有机质,而龙口湾入海河流较少,沉积物中的陆上有机质较少.
[Abstract]:The characteristics and sources of organic matter in the sediments of Laizhou Bay and Longkou Bay were analyzed by measuring the ratio of total organic carbon (TOC),) total nitrogen to total nitrogen (C / N) and stable carbon and nitrogen isotopes (未 13C, 未 15N) in the surface sediments of Laizhou Bay and Longkou Bay. The results show that the content of TOC in surface sediments of Laizhou Bay is 0.47% 卤0.40%, and the content of TOC in Longkou Bay is 0.82% 卤0.37%, so the content of organic matter in sediments of Longkou Bay is higher than that in Laizhou Bay. With the construction of the port, the velocity of water in Longkou Bay is slower than that in Laizhou Bay (43.89 渭 m), and the average grain size of sediment in Longkou Bay (19.40 渭 m) is much lower than that in Laizhou Bay (43.89 渭 m),). The 未 13C values of sediments in Laizhou Bay ranged from -24.96 鈥，
本文编号：2145269
[Abstract]:The characteristics and sources of organic matter in the sediments of Laizhou Bay and Longkou Bay were analyzed by measuring the ratio of total organic carbon (TOC),) total nitrogen to total nitrogen (C / N) and stable carbon and nitrogen isotopes (未 13C, 未 15N) in the surface sediments of Laizhou Bay and Longkou Bay. The results show that the content of TOC in surface sediments of Laizhou Bay is 0.47% 卤0.40%, and the content of TOC in Longkou Bay is 0.82% 卤0.37%, so the content of organic matter in sediments of Longkou Bay is higher than that in Laizhou Bay. With the construction of the port, the velocity of water in Longkou Bay is slower than that in Laizhou Bay (43.89 渭 m), and the average grain size of sediment in Longkou Bay (19.40 渭 m) is much lower than that in Laizhou Bay (43.89 渭 m),). The 未 13C values of sediments in Laizhou Bay ranged from -24.96 鈥，
本文编号：2145269
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