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Sediment geochemistry

机译：沉积地球化学

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As important components of marine organic matters especially of organic nitrogen, amino acids play an important role in organic matter cycles owing to their lability. The concentration, composition, and distribution of amino acids have been widely used to indicate the degradation state of organic matters in particulates and sediments of marine. Here, the distribution, influencing factors of amino acids and their role in indicating degradation of organic matters were systematically summarized. Gly, Glu, Ala, and Asp were the major components of amino acids in marine particulates and sediments. The contents of amino acids in the particles and sediments showed a decreasing tendency from the coastal waters to the open sea, and adecreased with the water depth. The lower value of %AA-C/TOC, %AA-N/TN and degradation index (DI) based on changes in the composition of amino acids indicated the higher degradation degrees of organic matters. The reactivity index (RI) and ratios of D-AA and L-AA (D/L) based on non-protein amino acids and D-AA were used to indicate the degradation of organic matter according to the bacterial transformation of amino acids, in which RI value closer to 0, higher D/L, and lower ratios of protein amino acids to non-protein amino acids (Asp/β-Ala and Glu/γ-Aba) indicated the higher degree of degradation in organic matters. The migration and transformation of amino acid were mainly affected by dissolved oxygen, nutrient concentrations, sources of organic matter, depositional environments and microbial activities. Further studies should focus on the synergistic effects of particles and sediments, and also the effects and the specific regulatory roles of microorganisms on amino acids.
机译：作为普林有机物的重要组成部分，特别是有机氮，氨基酸由于其损伤而在有机物质循环中起重要作用。氨基酸的浓度，组合物和分布已被广泛用于表示颗粒和海洋沉积物中有机物质的降解状态。这里，系统总结了分布，影响氨基酸的影响及其在表明有机物质降解中的作用。 Gly，Glu，Ala和Asp是海洋颗粒和沉积物中氨基酸的主要成分。颗粒和沉积物中氨基酸的含量显示出从沿海水中的趋势降低到海洋，并用水深度分泌。基于氨基酸组合物的变化，％AA-C / TOC，％AA-N / TN和降解指数（DI）的较低值表明有机物质的较高降解程度。基于非蛋白质氨基酸和D-AA的D-AA和L-AA（D / L）的反应性指数（RI）和比率用于根据氨基酸的细菌转化来指示有机物质的降解，其中RI值接近0，较高的D / L和蛋白质氨基酸的低比率（ASP /β-ALA和GLU /γ-ABA）表明有机物质中较高的降解程度。氨基酸的迁移和转化主要受溶解的氧，营养浓度，有机物质来源，沉积环境和微生物活性的影响。进一步的研究应专注于颗粒和沉积物的协同作用，以及微生物对氨基酸的影响和特异性调节作用。

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    《Oceanographic Literature Review》 |2019年第5期|998-1003|共6页
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