Mechanisms of Organic Matter Preservation in Marine Sediments: A Focus on Oxygen Sensitive Organic Matter

对冲（OCE-9711690） 摘要 Hedges OCE-9711690 海洋科学的一个重要领域是海洋沉积物中有机物的分布和保存。 PI一直是这一领域研究的主要贡献者，他建议继续研究海洋沉积物中有机物的形式、分布和保存。 这项建议的一个主要目的是查明受到不同程度降解的沉积有机混合物的主要生化成分的变化。 将对现有的沉积物样品采用新的分析技术，有选择地提取有机碳。 因此，除了本体表征外，还将增加13 C NMR分析，以提供更详细的有机组成数据。 本研究的结果有望揭示海洋沉积物中有机物保存的两个基本问题，即1）氧敏感性如何与沉积物中有机物的保护性吸附相关; 2）氧敏感性在多大程度上 有机物可能直接 衍生 来自抗水解的生物大分子。

Hedges (OCE-9711690) ABSTRACT Hedges OCE-9711690 A major area of interest in marine sciences is the distribution and preservation of organic matter in marine sediments. The PI has been a key contributor to studies in this area, and he proposes to continue his research on the forms, distributions and preservation of organic matter in marine sediments. A major aim of this proposal is to identify shifts in the major biochemical compositions of sedimentary organic mixtures subjected to varying extents of degradation. New analytical techniques would be brought to bear on existing sediment samples which would be selectively extracted for organic carbon. Thus in addition to bulk characterizations, analyses by 13C NMR would be added to provide more detailed organic compositional data. Results from this study would be expected to unravel the two fundamental issues in the preservation of organic matter in marine sediments, namely 1) how oxygen-sensitivity relates to protective sorption of organic matter in sediments and 2) to what extent oxygen- sensitive organic matter might be directly derived from hydrolysis-resistant biomacromolecues.