渤海表层沉积物中木质素的分布特征及其对陆源有机物来源的示踪意义

Distribution of lignin in the surface sediments of Bohai Sea and its implication for tracing terrigenous organic matter

以渤海表层沉积物的木质素含量(Σ8和Λ8)及其特征参数为主要指征,结合总有机碳(TOC)、总氮(TN)、总有机质的稳定碳同位素(δ13C)讨论了其中陆源有机物的来源和分布。结果表明,海源有机物是研究海域有机物的主要来源(相对于陆源有机物而言);入海河流和海洋动力过程是影响研究海域陆源有机物分布的主要因素;该海域的木质素源有机物主要来自黄河流域和渤海三湾湿地被子植物的输入;酸醛比(Ad/Al)V则表明表层沉积物中的陆源有机物发生了不同程度的降解。

In this paper,the source and distribution of terrigenous organic matter in Bohai Sea was discussed by using lignin yield（Σ8 and Λ8） and its characteristic parameters as major indicators combined with elemental（TOC,TN,C/N）,stable carbon isotopic（δ^13C） analysis.The results showed that marine organic matters were the dominant source of organic matter in the study area relative to terrigenous organic matter,the distribution of the organic matters in study area was mainly controlled by riverine input and ocean hydrodynamics,and that lignin derived organic matters were from the input of nonwoody angiosperms along the Yellow River basin and the wetlands in three bays around Bohai Sea.Acid to aldehyde ratio of vanillyl phenols [（Ad/Al）v] indicated that terrigenous organic matters in surface sediments had undergone varying degrees of degradation.