摘要
海洋浮游植物承担着目前地球上光合作用的一半任务 ,对大气CO2 浓度和全球碳循环有重要的调控作用。从“铁假说”到“硅假说” ,反映了大洋“生物泵”尤其是海洋中的不同浮游植物群对过去气候变化的响应和反馈。根据不同浮游植物产生的特定生物标志物可以定量再造海洋浮游植物群落组成 ,如岩藻黄素、C2 8甾醇主要来自硅藻 ;而 19′ 己酰氧基岩藻黄素、C3 7—C3 9烯酮主要来自定鞭藻中的颗石藻。许多研究已成功利用现代环境中的色素和古代沉积物中的类脂物质 ,恢复水体中不同浮游植物的生物量和群落组成。虽然目前海洋浮游植物与生物标志物之间的关系还有待完善 ,但与其他方法相比仍不失为一种快速、有效的方法 。
Marine phytoplanktons (marine “bio-pumps”) bear half of the photosynthesis in the earth and play an important role in modulating the CO_2 concentration and global carbon cycle. The transition from the “iron hypothesis” to “silica hypothesis” reflects the responds and feedbacks of the “bio-pumps”, especially different marine phytoplanktons to the past climate changes. Different biomarkers produced by different phytoplanktons can be used to reconstruct marine phytoplankton community set-ups.For examples,fucoxanthin and C_(28)-sterols are mainly from Bacillariophyceae, whereas 19′-Hexanoyloxyfucoxanthin and C_(37)-C_(39) alketones are mainly from Haptophyceae. Special pigments in the water and lipids in the sediments have been successfully used to reconstruct the phytoplankton biomass and communies. Although the relationship between the phytoplanktons and the biomarkers needs much improvement, it is still proved a fast and efficient method compared with other methods and will have an important prospect in the future marine detection and paleoclimate research.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2004年第4期73-79,共7页
Marine Geology & Quaternary Geology
基金
国家重点基础研究发展规划项目 (G2 0 0 0 785 0 0 )
