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中文摘要：
利用气相色谱和气相色谱-质谱联用仪分析了湖北清江岩溶地区5种植物叶片类脂物的季节性变化特征．随季节的变化，同一植物叶片正构烷烃的碳数分布范围和主峰碳数不变，但正构烷烃的碳优势指数（CPI）从5月到11月逐渐降低，这种变化可能与植物叶片在枯萎过程中类脂物的变化有关，活体叶片与相应植物落叶的比较也证实了这点．这反映了在第四纪沉积物中正构烷烃CPI可能与腐殖化过程有关而可以指示与之相关的气候环境条件．不同植物的正构烷烃含量差别较大，对沉积物的输入贡献不一．正构烯烃含量和种类明显随季节变化，可能与环境温度变化有关．8月份温度最高，正构烯烃的种类最少．
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