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Characterstics of seasonal variations of leaf n-alkanes and n-alkenes in modern higher plants in Qingjiang, Hubei Province, China

ISSN号：0379-1726
期刊名称：《地球化学》
时间：0
分类：Q946[生物学—植物学]
作者机构：[1]State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China, [2]Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China
相关基金：Supported by the National Natural Science Foundation of China （Grant Nos. 40572098, 40525008, 40621002 and 40531004） and the 111 Project （Grant No. B08030）.We are grateful to the two anonymous referees for their constructive comments on an earlier version of our manuscript. We are indebted to Huang X. Y. and Pu Y. for the assistance in sampling, Hu C. Y. and Jiao D for providing some data and precious literatures, and Chen Lin for the maintenance of the GC and GC-MS.

作者： CUI JingWei[1], HUANG JunHua[1], XIE ShuCheng[2]

关键词：环境变化, n-烷烃, n-烯烃, 平均碳链长度, 高等植物, n-alkanes, n-alkenes, carbon preference index, average chain length, environmental change

中文摘要：

根据 GC 和 GCMS 分析，叶类脂化合物的季节的变化在湖北省在 Qingjiang 在五工厂种被观察。n 链烷的 CPI 价值(碳偏爱索引) 从 5 月逐渐地减少到 11 月，尽管在单个种的碳数分布和占优势的碳数保持未改变。拒绝的 CPI 价值可能被褪色的叶引起，它被落叶的叶子的比较进一步与新鲜叶子支持。这观察在第四级的沉积推断 n 链烷的 CPI 价值能被用作一个工具索引 humification，并且这样气候并且环境条件。这里分析的植物在 n 链烷丰富显示出显著差别，建议他们对在沉积识别的 n 链烷的微分贡献。丰富和 n 链烯的复合种类在叶子由于温度的影响与季节极大地改变的植物检测混合物在 8 月正在被识别，与最少。

英文摘要：

On the basis of GC and GC-MS analyses, the seasonal variation of leaf lipids is observed in five plant species in Qingjiang in Hubei Province. The CPI values （carbon preference index） of n-alkanes decrease gradually from May to November, though the carbon number distributions and the predominant carbon number in an individual species keep unchanged. The declined CPI values might be caused by the leaf fading, which is further supported by a comparison of the defoliated leaves with the fresh leaves. This observation infers the CPI values of n-alkanes in Quaternary sediments can be used as a tool to index the humification, and thus the climatic and the environmental conditions. The plants analyzed here show a remarkable difference in n-alkanes abundance, suggesting their differential contribution to the n-alkanes identified in sediments. The abundance and the compound species of the n-alkenes detected in the plant leaves change greatly with the seasons due to the influence of temperature, with the least compounds being identified in August.