【摘要】 该文对长江口、黄河口以及废黄河口现代沉积物中生物标志化合物组成进行分析。结果表明 :长江与黄河沉积物中的生物标志化合物组成有较大的差别 ,长江沉积物中具明显奇偶优势的高碳数正构烷烃以及 C2 9甾烷的相对含量较高 ,Pr/Ph值较大 ,受陆生高等植物的影响明显 ;黄河低碳数正构烷烃和 C2 7甾烷的相对含量较高 ,Pr/Ph值较小 ,受陆生高等植物的影响较弱。甾烷、萜烷的成熟度指数显示长江高于黄河、现代黄河高于废黄河。这些差异主要受流域环境背景和流域内人文过程两大不同因素的影响更多还原

【Abstract】 Organic geochemical measurments of the biomarker have be en carried out on three samples of the surface sediments collected from the bays o f the Changjiang River, the Huanghe River and the Old Huanghe River. The result shows that there are remarkable differences of the biomarkers between the sedime nts of the Changjiang River and the Huanghe River. In the sample of the Changjia ng River, the higher molecular weight n-alkanes with a strong odd/even predomin ance are dominant, and the relative content of C 29 sterane and Pr/Ph are c omparatively higher. All of these indicate that there is an obvious terrestrial plant input. But, in the sample of Huanghe River, the relative content of lower molecular weight n-alkanes and C 27 sterane are comparatively higher, and Pr/Ph is lower than that of the sample from the Changjiang River. The terrestria l plant input is not obvious. The maturity indices calculated from the hopane an d sterane are also very different in the two types of the surface sediments. The maturity indices of the biomarker in the sediment from the Changjiang River are greater than those from the Huanghe River. These phenomena may be caused mainly by the environmental and the anthropogenic differences between the drainage are as of the two great rivers.更多还原