长链烷基二醇在海洋环境重建中的研究进展

长链烷基二醇类化合物(Long-chain alkyl diols)是指在碳链的1号位置和链中位置连接有羟基基团的类脂化合物,普遍存在于海洋、河流和湖泊环境中。由于这类化合物分布广泛、性质稳定不易降解、且检测手段较为简单,因此具有作为生物标志物的潜力,在生物地球化学领域引起了广泛的研究和关注。关于其生物来源尚未有定论,但是研究发现1,13-diols和1,15-diols可能主要来自真眼点藻,而14-diols主要来自硅藻Proboscia。目前根据长链烷基二醇建立的指标包括:硅藻生产力、上升流强度、盐度、温度、河流输入和表层海水营养盐浓度等,对古环境气候的重建有着重要的意义。归纳总结了目前长链烷基二醇指标的研究和应用进展,这有助于未来我国边缘海长链烷基二醇来源以及二醇指标的深入研究。

Progress of Long-Chain Alkyl Diols in Marine Environmental Reconstruction

Long-chain alkyl diols contain an alkyl chain with alcohol groups at C1 and at the middle position of carbon chain,which exist widely in seas,rivers and lakes. It has been proven that these compounds are relatively resistant to degradation and have an extended occurrence in the geological record. In addition,they are relatively easy to identify. Therefore,long-chain alkyl diols can be used as potential biomarkers to trace the past change in paleoenvironment and paleoclimate. Although the sources of long-chain alkyl diols are still uncertain,the studies indicate that 1, 13 and 1, 15-diols are mainly produced by eustigmatophytes,while 14-diols are mainly from diatom Proboscia. So far,some proxies based on long-chain alkyl diols have been established to indicate the change in diatom productivity,upwelling intensity,salinity,sea surface temperature,riverine organic matter input and surface seawater nutrient concentration,which are significant for paleoenvironmental reconstruction. Current research and application of long-chain alkyl diols proxies were summarized,which would be helpful for further studying the source of long-chain alkyl diols and the application of relevant proxies in China’s marginal sea.