运用生物标志物研究全新世南黄海泥质区陆源有机质输入的变化

发布时间：2018-08-09 08:30

【摘要】：分析南黄海中部泥质区柱状样ZY1和ZY3中的生物标志物,来研究全新世沉积有机质的来源和运输过程的变化.根据海源生物标志物(菜子甾醇、甲藻甾醇和长链烯酮含量的总和(?PB,Phytoplankton Biomarker)和泉古醇(crenarchaeol))、陆源生物标志物(烷醇(?n-alkanols)和土壤厌氧细菌生物标志物(br GDGTs))以及TMBR′和BIT指标,重建了全新世黄海海源有机质(marine organic matter,MOM)和陆源有机质(terrestrial organic matter,TOM)的沉积历史.结果表明海源有机质和陆源有机质的变化与陆地植被丰度、海洋浮游植物生产力和海洋环流系统的输运过程有关.受海洋环流系统不断增强的影响,全新世南黄海海源生物标志物含量呈增加趋势,指示了海源有机质输入的增多.陆源生物标志物含量变化波动较大,揭示了影响黄海陆源有机质埋藏的因素可能更复杂:早全新世(7200~6000cal a BP)陆源有机质输入量适中,由于环流系统还未形成,输运黄海陆源有机质有限,但仍存在河流输运的陆源有机质.中全新世(6000~3000cal a BP)陆源有机质含量较低,陆源有机质供应的减少和环流系统输运的增强共同导致陆源生物标志物含量减少,但是变化趋势比较稳定.晚全新世(3000cal a BP至今)南黄海陆源有机质增加,原因是尽管陆地有机质的供应减少,但由于环流系统增强,输运较多陆源有机质至南黄海中部.
[Abstract]:The biomarkers of columnar ZY1 and ZY3 in the middle of South Huang Hai were analyzed to study the source and transport process of sedimentary organic matter in Holocene. Based on the sum of marine biomarkers (cyanosterol, pyrophytosterol and long chain ketene Biomarker) and (crenarchaeol), (alkanols) and (br GDGTs), as well as TMBR 'and BIT indexes, The sedimentary history of the Holocene Huang Hai organic matter (marine organic mattermom) and the terrestrial organic matter (terrestrial organic mattert Tom) has been reconstructed. The results show that the changes of marine organic matter and terrestrial organic matter are related to the abundance of terrestrial vegetation, the productivity of marine phytoplankton and the transport process of marine circulation system. Under the influence of ocean circulation system, the content of biomarkers in the South Huang Hai source of the Holocene showed an increasing trend, indicating the increase of organic matter input from the sea source. The variation of land-based biomarkers varies greatly, which indicates that the factors affecting the burial of terrestrial organic matter in Huang Hai may be more complicated: the early Holocene (7200~6000cal a BP) land-based organic matter input is moderate, because the circulation system has not yet been formed), The transportations of Huang Hai terrestrial organic matter are limited, but there are still terrestrial organic matter transported by rivers. In the Middle Holocene (6000~3000cal a BP), the decrease of organic matter supply and the increase of circulation system resulted in the decrease of land-based biomarkers, but the variation trend was stable. Since the late Holocene (3000cal a BP), the terrestrial organic matter of the southern Huang Hai increased because, although the supply of terrestrial organic matter decreased, the circulation system was strengthened, and more terrestrial organic matter was transported to the middle of South Huang Hai.
【作者单位】：中国海洋大学海洋化学理论与工程技术教育部重点实验室;国土资源部海洋油气资源与环境地质重点实验室;国家海洋局第三海洋研究所;中国海洋大学海洋地质学院;
【基金】：国家自然科学基金项目(批准号:41221004) 国土资源部海洋油气资源与环境地质重点实验室项目(编号:MRE201301) 国家重点基础研究发展计划项目(编号:2010CB428901) 高等学校学科创新引智计划项目(编号:B13030)资助
【分类号】：P736.22

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