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论文题目: Long-chain branched/cyclic alkanes inrecent sediment of Lake Fuxian and their environmental implications
课题编号: 2012CB956104 类别: SCI
作者: Yongdong Zhang, Yaling Su, Zhengwen Liu, Xiangchao Chen et al. SCI期刊区属:
杂志名称: Chinese Science Bulletin 卷期: 59
年份: 2014 是否责任作者:
页码: 1139-1150 标注:
作者单位: 中国科学院南京地理与湖泊研究所 下载:
摘要
Lake Fuxian is a large, deep, and oligotrophic freshwater lake. In recent sediment of this lake, a series of branched and cyclic alkanes, including branched alkanes with one or two quaternary carbon atoms (C2n compounds), alkylcycloheptane, and alkylcyclohexane, were detected in high abundance. For each homolog of long-chain branched/cyclic alkanes, molecules with only an odd or even carbon number were present in the sediment. The abundance variation of each compound homolog corresponded to those of other compound homolog in the section, indicating the same origin of these compounds. The concentrations of long-chain branched/cyclic alkanes in the sediment profile exhibited variations similar to those of phytoplankton biomarkers, such as 3-methyl-alkanes, short-chain odd carbon n-alkanes, hopene, polyunsaturated fatty acids, phytol, sterols, and long-chain alkyl diols, but slightly different from those of long-chain odd carbon n-alkanes, which are ubiquitous biomarkers for higher plants. Therefore, the C2n compounds and long-chain cyclic alkanes in the lake sediment were most likely produced by algae and bacteria in the water, primarily, by the heterotrophic bacteria in the moderately oxygenated waters, which flourishing might be the results of specific water environments in Lake Fuxian.
 
Copyright (C) 2012 版权所有:湖泊与湿地生态系统对全球变化的响应及生态恢复对策研究
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