基于甾醇和碳同位素重建胶州湾沉积物有机质来源和浮游植物演化历史
Historical reconstructions of sedimentary organic matter sources and phytoplankton evolution in the Jiaozhou Bay based on sterols and carbon isotope.
机构信息
CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Function Laboratory of Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; University of Chinese Academy of Sciences, Beijing 100049, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China.
CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Function Laboratory of Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; University of Chinese Academy of Sciences, Beijing 100049, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; Public Technology Service Center, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.
出版信息
Mar Pollut Bull. 2021 Apr;165:112109. doi: 10.1016/j.marpolbul.2021.112109. Epub 2021 Feb 10.
Bulk organic matter proxies including total organic carbon (TOC), total nitrogen (TN), C/N ratio and carbon stable isotopic composition (δC) combined with sterols in a sediment core were studied to reconstruct both organic matter (OM) sources and phytoplankton evolutions of the Jiaozhou Bay (JZB) during the past ~ 80 years. The OM source allocations were calculated based on δC and sterol. The results showed that the marine OM (MOM) input was the dominant OM sources, with the marine organic carbon (OC) proportion of 54.2-78.4% and marine sterol proportion of 63.9-72.7%. The Terrestrial OM (TOM) contribution increased especially since the 1960s, mainly attributed to the increased sewage discharge and usage of fertilizer. Elevated marine primary productivity since the 1980s was mainly attributed to the increased nutrient inputs. Evolution of diatom compared with dinoflagellate in the JZB was closely related to the anthropogenic forcing and climate change.
本研究通过对取自胶州湾的柱状沉积物中总有机碳（TOC）、总氮（TN）、碳氮比（C/N）和碳稳定同位素组成（δC）等生源要素指标与甾醇指标的综合分析，探讨了过去约 80 年来该海域生源要素的分布特征及其对陆源和浮游植物演变的指示意义。利用生源要素的δC 和甾醇指标定量计算了各生源要素的相对贡献，结果表明，海洋有机质（MOM）是胶州湾沉积物有机质的主要来源，其贡献率为 54.2-78.4%，海洋甾醇的贡献率为 63.9-72.7%。20 世纪 60 年代以来，由于污水排放和化肥使用的增加，陆源有机质（TOM）的贡献明显增加。20 世纪 80 年代以来，海洋初级生产力的增加主要归因于营养物质的输入增加。与浮游植物的演替相比，胶州湾中硅藻的演替与人为因素和气候变化密切相关。
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