南海沉积物沉积有机态Fe与Fe限制的分析  

Analysis of the organic matter phase iron in sediments and iron-limitation in the South China Sea

作　　者：卢东伟[1,2] 陈绍勇[3] 龙爱民[1] 党爱翠[1,2] 程远月[1] 

机构地区：[1]中国科学院南海海洋研究所LED实验室,广东广州510301 [2]中国科学院研究生院,北京100039 [3]中国科学院广州地球化学研究所中国科学院边缘海地质重点实验室,广东广州510640

出　　处：《海洋通报》2011年第3期302-309,共8页Marine Science Bulletin

基　　金：国家自然科学基金(40676049);大洋协会项目(DYXM115-02-1-08);国家科技基础专项(2008FY110100)

摘　　要：Fe限制的研究对于探讨全球CO2变化及解决"温室效应"具有重要的意义。南海兼具开阔大洋和边缘海的特征,其古生产力的演变对区域及全球气候变化的研究具有重要作用。本文采用连续提取法对两个南海柱样沉积物中的Fe,Ba,Al等主要金属元素进行了形态分析,并将两个站位沉积物中沉积有机态Fe与Al/Ti比值、TOC、生源Ba等古生产力指标做进一步的相关分析。结果表明,残渣态为沉积物中金属元素的主要存在形态,而沉积有机态Fe与古生产力存在正相关关系。这表明了沉积有机态Fe与古生产力之间存在的关系,可能反映了所研究海域的海洋初级生产受到了Fe限制。Paleo-production is of great importance for global CO2-variance and greenhouse effect investigation.The South China Sea has the combined characteristics of open sea and marginal sea,and the evolution of its paleo-production is important for regional and global climate change.In this paper,the species of major metal elements including Fe,Ba and Al in two sediment cores from South China Sea were measured after sequential extraction,and the relationships between the organic matter phase of Fe and Al/Ti,TOC,biogenic Ba were analyzed.The results indicated that the first speciation of metal elements in sediments was residua,and there was a positive relationship between the organic matter phase of Fe and paleo-productivity.The different relationships between the organic matter phase of Fe and paleo-productivity in two studied sediment cores indicated that paleo-productivity might be iron-limited in the studied zones in the South China Sea.

关 键 词：古生产力 连续提取法 沉积有机态Fe Fe限制 

分 类 号：P736.221[天文地球—海洋地质]