东海内陆架岩心中木质素的沉积记录

Sedimentary Lignin Records in a Core from the East China Sea Inner Shelf

通过对东海内陆架T06岩心样品中木质素的测定,依据木质素参数对古环境、古气候的指示作用,探究了陆源有机碳在该区域的沉积记录,以及8.8 ka B.P.以来浙闽沿岸在不同历史环境下有机物的输送机制。研究结果显示,东海内陆架海域东亚冬季风驱动的水动力输送对沉积物中木质素酚类单体的含量变化及其相关参数起着至关重要的调控作用;反之,木质素含量及其相关参数可以在一定程度上指示东亚冬季风的变化,可能是重建东亚冬季风的可靠指标。本研究还发现,木质素相关参数剧烈波动的“50年”时期,可能是由于气候变化和长江流域洪水不断,导致大量非木本被子植物残渣和表层土壤的输入,并最终在水动力和洋流作用下沉积埋藏。

The sedimentary record of organic carbon from the East China Sea inner shelf was explored by determining the lignin in core T06.The transport mechanism of organic matter in different historical environments along the Zheji⁃ang⁃Fujian coast was also investigated for the period since 8.8 ka B.P.by the indicator function of lignin on the pa⁃leoenvironment and paleoclimate.The results revealed that hydrodynamic transport driven by the East Asian winter monsoon in the East China Sea inner shelf played an important role in the variation of the content and its related pa⁃rameters of lignin phenols in the sediments.Vise verse,the lignin content and its related parameters in the mud areas along the Zhejiang⁃Fujian coast indicate the influence of variation in the East Asian winter monsoon in the study area to some extent.Therefore,these are reliable indicators for reconstructing East Asian winter monsoonal climate change.The current study also revealed a“50 years”period during which dramatic data fluctuations were observed.The period might have been due to climate change and continuous flooding in the Yangtze River Basin.This led to the transport of a large amount of non-woody angiosperm residue and surface soil to the study area,which were finally de⁃posited and buried in the sediment core,via hydrodynamic transport and ocean currents.