南海表层沉积物中有机物分布研究

AN ORGANIC GEOCHEMICAL STUDY ON SURFACE SEDIMENTS FROM SOUTH CHINA SEA

对南海表层沉积物中正构烷烃和多环芳烃的含量与分布进行了调查研究。发现南海表层沉积物的正构烷烃碳数分布范围多在C_16－C_33，奇偶优势指数OEP值略大于1，显示有机质输入有混合源的特征；共检出近60种多环芳烃化合物，包括萘、菲、蒽、芴、萤蒽、芘、系列化合物和惹烯、等陆源输入标志物。在此基础上，将所获得的数据进行了因子分析，其结果显示南海表层沉积物的物质输入有如下的特点：陆源高等植物输入和燃烧产物的贡献从北向南递减，而海源输入的特征是由北向南显著。

The abundances of n-ALKs and PAHs in 9 surface sediment samplesfrom the South China Sea are analyzed to determine the input source variations. WithOEP>1 and weak odd to even carbon preference for n-alkanes, these samplesindicate probably the mixed contributions of organic materials. Moreover, about 60polycyclic aromatic hydrocarbons (PAHs) are discovered in the sediments, includingsome biomarkers such as perylene, retene and tetrahydrocarbons. The results of factoranalysis suggest that the contribution of high plants and combustion products decreasesfrom the north to the south; while marine autochthonous input increases from thesouth to the north of the South China Sea.