应用木质素示踪楚科奇海表层沉积物中有机碳的来源和降解程度
发布时间：2019-01-27 10:46
【摘要】：埋藏在海洋沉积物中的有机碳是大气二氧化碳的净汇,而埋藏过程主要发生在陆架区。北冰洋拥有全球最大的陆架,接收大量来自河流和沿岸侵蚀输运的陆源有机碳,楚科奇海作为北冰洋的边缘海,是有机碳埋藏的重要海区之一。本研究选用楚科奇海和海台的表层沉积物(陆架区33~82.69m,陆坡区164.63~3 763m),通过木质素,结合粒度、比表面积、有机碳百分含量(OC%)、有机碳稳定同位素(δ13C)等指标来示踪楚科奇海沉积物有机碳的来源和降解程度。结果表明,有机碳载荷从陆架到陆坡有明显的降低趋势;δ13C的范围指示有机碳可能来自苔藓、草本裸子植被、浮游植物和冰藻等;木质素丁香基酚(S)与香草基酚(V)的比值(S/V)和肉桂基酚(C)与香草基酚(V)的比值(C/V)表明裸子植物的草本组织贡献了更多的陆源有机碳;此外,较高含量的C9DA二酸(干酪根氧化产物)表明干酪根也可能是楚科奇海表层沉积物中有机质来源的重要组成。指示降解的参数[(Ad/Al)s、(Ad/Al)v、(Ad/Al)p、3,5-Bd/V]在陆架和陆坡沉积物中的差异表明陆坡沉积物中有机质的降解过程受到水动力分选以及原位降解等因素的影响更为明显。
[Abstract]:The organic carbon buried in marine sediments is a net sink of atmospheric carbon dioxide, while the burial process mainly occurs in continental shelf. The Arctic Ocean has the largest continental shelf in the world and receives a large amount of terrestrial organic carbon from rivers and coastal erosion and transport. As the marginal sea of the Arctic Ocean, the Chukchi Sea is one of the important sea areas where organic carbon is buried. In this study, the surface sediments of the Chukchi Sea and the sea platform (3382.69 m in the continental shelf and 164.63 m in the slope region) were selected through lignin, binding granularity, specific surface area, and organic carbon content (OC%). The organic carbon stable isotopes (未 13C) were used to trace the source and degradation of organic carbon in the sediments of the Chukchi Sea. The results showed that the organic carbon load decreased obviously from shelf to slope, and the range of 未 13 C indicated that organic carbon might come from bryophytes, herbaceous bare seed vegetation, phytoplankton and ice algae. The ratio of lignin eugenol (S) to vanillin (V) (S / V) and cinnamophenol (C) to vanillin (V) (C / V) indicated that the herbaceous tissues of gymnosperms contributed more terrestrial organic carbon. In addition, the high content of C9DA diacid (kerogen oxidation product) indicates that kerogen may also be an important component of organic matter source in the surface sediments of the Chukchi Sea. Parameter indicating degradation [(Ad/Al) s, (Ad/Al) v, (Ad/Al) p, The difference of 35-Bd / V in continental shelf and slope sediment indicates that the degradation process of organic matter in continental slope sediment is more obviously influenced by hydrodynamic separation and in-situ degradation.
【作者单位】： 浙江大学海洋学院;国家海洋局第二海洋研究所国家海洋局海洋生态系统与生物地球化学重点实验室;
【基金】：国家自然科学基金项目(41606211,41276198) 中国极地考察专项(Chinare-03-04专题,Chinare-04-03专题) 国家博士后面上基金(2016M591968) 国家海洋局第二海洋研究所博士后项目(JG1502)
【分类号】：P736.41
本文编号：2416186
[Abstract]:The organic carbon buried in marine sediments is a net sink of atmospheric carbon dioxide, while the burial process mainly occurs in continental shelf. The Arctic Ocean has the largest continental shelf in the world and receives a large amount of terrestrial organic carbon from rivers and coastal erosion and transport. As the marginal sea of the Arctic Ocean, the Chukchi Sea is one of the important sea areas where organic carbon is buried. In this study, the surface sediments of the Chukchi Sea and the sea platform (3382.69 m in the continental shelf and 164.63 m in the slope region) were selected through lignin, binding granularity, specific surface area, and organic carbon content (OC%). The organic carbon stable isotopes (未 13C) were used to trace the source and degradation of organic carbon in the sediments of the Chukchi Sea. The results showed that the organic carbon load decreased obviously from shelf to slope, and the range of 未 13 C indicated that organic carbon might come from bryophytes, herbaceous bare seed vegetation, phytoplankton and ice algae. The ratio of lignin eugenol (S) to vanillin (V) (S / V) and cinnamophenol (C) to vanillin (V) (C / V) indicated that the herbaceous tissues of gymnosperms contributed more terrestrial organic carbon. In addition, the high content of C9DA diacid (kerogen oxidation product) indicates that kerogen may also be an important component of organic matter source in the surface sediments of the Chukchi Sea. Parameter indicating degradation [(Ad/Al) s, (Ad/Al) v, (Ad/Al) p, The difference of 35-Bd / V in continental shelf and slope sediment indicates that the degradation process of organic matter in continental slope sediment is more obviously influenced by hydrodynamic separation and in-situ degradation.
【作者单位】： 浙江大学海洋学院;国家海洋局第二海洋研究所国家海洋局海洋生态系统与生物地球化学重点实验室;
【基金】：国家自然科学基金项目(41606211,41276198) 中国极地考察专项(Chinare-03-04专题,Chinare-04-03专题) 国家博士后面上基金(2016M591968) 国家海洋局第二海洋研究所博士后项目(JG1502)
【分类号】：P736.41
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