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科学通报  2012 

青藏高原中部纳木错湖泊表层沉积物有机质空间分布及其揭示的沉积过程

, PP. 3090-3099

Keywords: 青藏高原,纳木错,表层沉积物,空间分布,沉积过程

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Abstract:

对青藏高原中部纳木错湖泊表层沉积物中总有机碳(TOC)、总氮(TN)、碳氮比(C/N)以及正构烷烃组分和含量等指标进行研究,分析了沉积物有机质的来源及其空间分布特征,进而探讨了影响沉积物有机质空间分布的控制因素以及古湖泊学意义.结果表明,纳木错表层沉积物有机质来源与正构烷烃的组成一致,具有沉水植物>陆生植物>低等菌藻的组成特征.纳木错表层沉积物有机质分布具有典型的空间差异性,其沉积过程主要受湖泊水下地形、河流补给以及湖泊水质等因素影响,表现出从物源向沉积中心富集的特点.纳木错表层沉积物有机质空间分布差异性决定了不同区域的沉积物对环境变化响应具有不同的敏感程度,是利用湖芯沉积进行过去环境变化研究的重要依据.

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