The fate of terrestrial organic matter in two Scottish sea lochs
The fate of terrestrial organic matter in two Scottish sea lochs
复制标题
苏格兰两个海湾中陆地有机物的命运
DOI：
10.1016/j.ecss.2007.07.023
复制
发表时间：
2008
影响因子：
2.8
通讯作者：
A. Miller
中科院分区：
文献类型：
--
作者：
P. Loh;A. Reeves;S. M. Harvey;J. Overnell;A. Miller
海洋洛克斯是有机质快速周转的区域。大部分有机质是外来的，通过淡水输入进入洛克斯湖。在这项研究中的行为的terrestrially派生OM阐明使用的组合参数，这表明OM成岩作用在近表层沉积物从两个苏格兰海洛克斯，洛赫克雷兰湖和洛赫Etive。采用碱性氧化铜氧化法测定了沉积物中作为陆源有机质生物标志物的木质素酚。测定了稳定碳同位素、总碳、总氮和总有机质（包括不稳定组分和难降解组分）组成。洛克斯湖中的木质素物质一般都高度降解，而且向海的进一步降解很少。香草酸香草醛的比例，（Ad/Al）v的洛克斯从0.52到2.69不等。然而，有一小部分相对新鲜的，陆地来源的OM，仍在进行降解添加到碳循环的洛克斯，所示的Rp值（耐火材料的比例，总OM）和OC/N比在表层沉积物。在洛赫克雷兰的水文和水动力制度的结果在几个现象，如通过水动力分选过程的陆地碎片的运输和促进表面沉积物成岩作用的生物扰动。频繁的水更新导致更好的水循环和氧化，促进OM分解。在洛赫Etive，更新频率较低，导致沿着洛赫的OM成岩作用较为恒定。
Sea lochs are zones of rapid organic matter (OM) turnover. Most of this OM is of allochthonous origin, being introduced into the lochs via freshwater input. In this study the behaviour of terrestrially derived OM was elucidated using a combination of parameters which indicate OM diagenesis in the near surface sediments from two Scottish sea lochs, Loch Creran and Loch Etive. Alkaline CuO oxidation was used to determine lignin phenols which serve as biomarkers for terrestrial OM in sediments. Stable carbon isotope, total carbon and nitrogen and total OM (including the labile and refractory fractions) compositions were also determined. Lignin materials in the lochs were generally highly degraded and undergo little degradation further seaward. The vanillic acid to vanillin ratio, (Ad/Al)v in the lochs ranged from 0.52 to 2.69. However, there was a fraction of relatively fresh, land-derived OM, still undergoing degradation adding to the carbon cycling in the lochs, as indicated by the Rp values (ratio of refractory to total OM) and OC/N ratios in the surface sediments. The hydrological and hydrodynamic regimes in Loch Creran result in several phenomena such as the transportation of terrestrial debris via hydrodynamic sorting processes and the promotion of surface sediment diagenesis by bioturbation. Frequent water renewal results in better water circulation and oxygenation which facilitate OM decomposition. In Loch Etive the less frequent renewal gives rise to a more constant OM diagenesis along the loch.