植物中单体烷烃碳同位素组成与其生长环境的关系  

Relationship between the Carbon Isotope Composition of Single Alkanes in Plants and Their Growing Environment

作　　者：李玉梅[1] 陈践发[2] 罗健[3] 刘东生[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院兰州地质研究所,兰州730000 [3]石油勘探开发研究院,北京100083

出　　处：《地质学报》2000年第3期273-278,共6页Acta Geologica Sinica

摘　　要：用色谱—同位素质谱仪对青藏高原东北部高寒草甸生态系统中的两种高等植物—火绒草(Leontopodium leontopodioidies)和蒲公英(Taraxacum mongolicum)的烷烃进行分析,讨论环境因素对植物单体烷烃碳同位素组成(δ^(13)C_(ia))的影响。研究发现,两种植物奇碳数正构烷烃的δ^(13)C_(ia)值都比较小,且有随海拔高度的增加而增大的趋势,而偶碳数正构烷烃的δ^(13)C_(ia)值则比较离散,变化也没有规律。奇碳数正构烷烃的δ^(13)C_(ia)值可能是反映气候变化的较好指标。The carbon isotope composition of single alkanes (δ13Cia) in two plants (Leontopodium leon-to podiaidies and Taraxacum mongolicum) growing in the northeastern Qinghai-Tibet plateau was analyzed by means of GC-IMS in order to know its relationship with altitude,and furthemore, to gain new data for the research on climatic changes. The results show that the δ13Cia values in n-alkanes with odd carbon atoms are relatively small and increase with the altitude, whereas those of n -alkanes with even carbon atoms are discrete and change irregularly. The former may be good indicators for changes in temperature and pco2 of the growing conditions of plants.

关 键 词：烷烃 碳同位素 海拔高度 植物 气候变化 

分 类 号：P597[天文地球—地球化学]