中文摘要：

在这研究， 67 件表面沉积样品在中央西藏从 Nam 公司收集了为全部的碳，全部的器官的碳和全部的氮被分析，并且这些中的 51 个取样也为 n 链烷被分析。起源和有机物的空间分发然后用这些代理，和负责的控制因素被调查因为空间分发模式和 paleolimnological 意义被讨论。结果显示在 Nam 公司的表面沉积的有机物的起源与 n 链烷的来源一致，它是首先沉没的植物，由陆上的植物，然后水的水藻和细菌列在后面。在湖的表面沉积的有机物显示出典型空间可变性。因为大影响在水下地形学，河输入和水质量，有机物的空间分发从来源被充实到存款中心。在湖的有机物的这空间可变性显示在不同区域的沉积有不同敏感到环境变化，它用湖沉积核心对 paleoenvironments 和古气候的重建重要。

英文摘要：

In this study, 67 surface sediment samples collected from Nam Co in central Tibet were analyzed for total carbon, total organic carbon and total nitrogen, and 51 of these samples were also analyzed for n-alkanes. The origin and spatial distribution of organic matter were then investigated using these proxies, and the control factors responsible for the spatial distribution patterns and paleolimnological significance were discussed. The results indicated that the origin of organic matter in surface sediment of Nam Co is consistent with the sources of n-alkanes, which were primarily submerged plants, followed by terrestrial plants, and then aquatic algae and bacteria. The organic matter in surface sediments of the lake showed typical spatial variability. Because of the great influence of underwater topography, river inputs and water quality, the spatial distribution of organic matter is enriched from the source to the deposit center. This spatial variability of organic matter in the lake indicates that the sediments in different areas have different sensitivities to environmental changes, which is important to reconstruction of paleoenvironments and paleoclimate using lake sediment cores.