【摘要】：埋藏在海洋沉積物中的有機碳是大氣二氧化碳的凈匯,而埋藏過程主要發(fā)生在陸架區(qū)。北冰洋擁有全球最大的陸架,接收大量來自河流和沿岸侵蝕輸運的陸源有機碳,楚科奇海作為北冰洋的邊緣海,是有機碳埋藏的重要海區(qū)之一。本研究選用楚科奇海和海臺的表層沉積物(陸架區(qū)33~82.69m,陸坡區(qū)164.63~3 763m),通過木質(zhì)素,結合粒度、比表面積、有機碳百分含量(OC%)、有機碳穩(wěn)定同位素(δ13C)等指標來示蹤楚科奇海沉積物有機碳的來源和降解程度。結果表明,有機碳載荷從陸架到陸坡有明顯的降低趨勢;δ13C的范圍指示有機碳可能來自苔蘚、草本裸子植被、浮游植物和冰藻等;木質(zhì)素丁香基酚(S)與香草基酚(V)的比值(S/V)和肉桂基酚(C)與香草基酚(V)的比值(C/V)表明裸子植物的草本組織貢獻了更多的陸源有機碳;此外,較高含量的C9DA二酸(干酪根氧化產(chǎn)物)表明干酪根也可能是楚科奇海表層沉積物中有機質(zhì)來源的重要組成。指示降解的參數(shù)[(Ad/Al)s、(Ad/Al)v、(Ad/Al)p、3,5-Bd/V]在陸架和陸坡沉積物中的差異表明陸坡沉積物中有機質(zhì)的降解過程受到水動力分選以及原位降解等因素的影響更為明顯。
[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.
【作者單位】： 浙江大學海洋學院;國家海洋局第二海洋研究所國家海洋局海洋生態(tài)系統(tǒng)與生物地球化學重點實驗室;
【基金】：國家自然科學基金項目(41606211,41276198) 中國極地考察專項(Chinare-03-04專題,Chinare-04-03專題) 國家博士后面上基金(2016M591968) 國家海洋局第二海洋研究所博士后項目(JG1502)
【分類號】：P736.41

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