摘要
分析了浙江南部近海(东海陆架泥质区)沉积物柱状样中游离态和碱不稳定结合态脂类生物标志物的组成。沉积物中的脂肪酸呈现以C16脂肪酸为主峰的单峰形分布趋势,具明显偶碳优势,除表层沉积物中脂肪酸以游离态为主外,结合态为柱状样中脂肪酸的主要存在形态,脂肪酸的垂直分布主要由降解作用控制;以甾醇和脂肪醇为主体的醇酮组分主要以游离态形式存在于沉积物中,但植醇主要分布于结合态中,降解作用同样是决定醇酮组分垂直分布的主要因素,只是对于烯酮来说,东海水体的富营养化很可能也极大影响了其垂直分布,另外在1950—1969年左右的沉积物中,多种脂类物质的含量出现异常,经分析这很可能反映了1954年长江特大洪水和1969年长江中下游洪水对当时东海上层水体生态系统的影响;烷烃呈现以C29,C31和C17烷烃为主峰的双峰形分布趋势,游离态为烷烃的主要存在形式,且UCM(不可分辨成分)峰仅出现在游离态烷烃组分的气相色谱图中。
Previous studies show that： the composition and form distribution of lipids vary distinctly in different sediments,so to study the composition and form distribution of lipids biomarkers in southern coastal area of Zhejiang Province（the mud areas of the East China Sea shelf）,a sediment core is collected,free and OH——labile lipids of the core are released via sequential treatments.Results show that fatty acids are in obvious even carbon number predominance,and characteristic of single peak with C16-fatty acids as the main peak,the vertical content distribution of fatty acids is mainly controlled by degradation,bound form is the main existent form of fatty acids in the core except in surficial sediment,where fatty acids mainly exist in free forms.AK（fractions of alcohols and ketones） which are constituted mainly by sterols and fatty alcohols exist as free forms in majority,but phytols perform distinctly which mainly exist in bound forms,degradation mightily affects their vertical content distributions,but for ketones,eutrophication of the upper water in the East China Sea probably also play an important role,and in sediments of about 1950-1969,the contents of many lipids vary abnormally,we consider that this may illuminate the possible change of the ecosystem of upper water in the East China Sea caused by Changjiang River floods in 1954 and 1969.Hydrocarbons are characteristic of double peaks,and the concentration of C29,C31 are higher than other hydrocarbons,hydrocarbons are mainly exist in free forms,and UCM（Unresolved Complex Mixtures） peaks only emerge in chromatograms of free hydrocarbons fractions.Fatty acids and AK in each form are mainly from marine sources while terrestrial input is the main source of hydrocarbons.
出处
《海洋学报》
CAS
CSCD
北大核心
2011年第5期83-90,共8页
基金
国家重点基础研究发展计划(2010CB428701
2001CB409703)
国家自然科学基金项目(41076065)
关键词
东海陆架泥质区
沉积物
脂类生物标志物
形态分布
the mud areas of the East China Sea shelf
sediments
lipids biomarkers
form distribution
