The effect of grain size and surface area on organic matter, lignin and carbohydrate concentration, and molecular compositions in Peru Margin sediments
The effect of grain size and surface area on organic matter, lignin and carbohydrate concentration, and molecular compositions in Peru Margin sediments
复制标题
DOI：
10.1016/s0016-7037(96)00394-8
复制
发表时间：
1997-03-01
影响因子：
5
通讯作者：
Hedges, JI
中科院分区：
文献类型：
--
作者：
Bergamaschi, BA;Tsamakis, E;Hedges, JI
从秘鲁边缘富含C的沉积物样品分为9个流体动力学确定的粒度级，探讨粒度分布和沉积物表面积对有机质含量和组成的影响。中性单体碳水化合物的组合物，木质素氧化产物的产量，总有机碳，总氮含量分别测定独立的每个尺寸级分，除了沉积物的表面积和丰富的生物蛋白石。有机碳和总氮的百分比是密切相关的表面积在这些沉积物。反过来，表面积的分布紧随质量分布之间的纹理大小类，这表明流体动力学控制粒度也控制有机碳含量。然而，有机组成的区别之间的纹理大小classes.Total中性碳水化合物产量在秘鲁边缘沉积物被发现密切平行的总有机碳的趋势，增加了丰富的粒度级之间的沉积物表面积的比例。与绝对丰度的增加相一致，鼠李糖和甘露糖作为与表面积一致的总碳水化合物产率的一部分而增加，表明这些单体优先在与表面相关的碳水化合物中表示。木质素氧化产物产率随有机碳归一化时的表面积而变化，这表明陆地来源的组分可能被海洋来源的材料的吸附稀释。木质素为基础的参数表明，一个单独的来源与砂大小的材料，而不是与粉砂和粘土相关的陆地衍生材料。版权所有（C）1997 Elsevier Science Ltd.
A C-rich sediment sample from the Peru Margin was sorted into nine hydrodynamically-determined grain size fractions to explore the effect of grain size distribution and sediment surface area on organic matter content and composition. The neutral monomeric carbohydrate composition, lignin oxidation product yields, total organic carbon, and total nitrogen contents were determined independently for each size fraction, in addition to sediment surface area and abundance of biogenic opal.The percent organic carbon and percent total nitrogen were strongly related to surface area in these sediments. In turn, the distribution of surface area closely followed mass distribution among the textural size classes, suggesting hydrodynamic controls on grain size also control organic carbon content. Nevertheless, organic compositional distinctions were observed between textural size classes.Total neutral carbohydrate yields in the Peru Margin sediments were found to closely parallel trends in total organic carbon, increasing in abundance among grain size fractions in proportion to sediment surface area. Coincident with the increases in absolute abundance, rhamnose and mannose increased as a fraction of the total carbohydrate yield in concert with surface area, indicating these monomers were preferentially represented in carbohydrates associated with surfaces. Lignin oxidation product yields varied with surface area when normalized to organic carbon, suggesting that the terrestrially-derived component may be diluted by sorption of marine derived material. Lignin-based parameters suggest a separate source for terrestrially derived material associated with sand-size material as opposed to that associated with silts and clays. Copyright (C) 1997 Elsevier Science Ltd.