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高原植物正构烷烃的奇偶优势及其环境指示意义 被引量:3

Odd-even preference of n-alkanes in plateau plants and its environmental indication significance
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摘要 利用气相色谱技术对青藏高原东北部高寒草甸生态系统中高等植物火绒草和蒲公英的正构烷烃分布特征及其碳优势指数(CPI)、奇偶优势指数(OEP)进行分析,发现两种植物抽提物中正构烷烃主要为C_(11)~C_(35),丰度最大的为C_(29)、C_(27)和C_(31);正构烷烃具有非常明显的奇偶优势;蒲公英正构烷烃CPI和OEP存在随海拔升高而加强的变化趋势,火绒草正构烷烃奇偶优势随海拔升高虽有一定变化但规律性不强。 The distribution characteristics, carbon preference index (CPI) and odd-even preference (OEP) of n-alkane in Leontopodium leontopodioidie and Taraxacum mongolicum in alpine meadow of northeastern Tibetan Plateau are analyzed by gas chromatograph. The results confirm that the n-alkanes mainly range from CI~ to C35in the two plants, and the maximum abundance are C29, C27 and C31 ; the n-alkane has a strong odd-even preference in higher plants of Taraxacum mongolicum and Leontopodium leontopodioidie. The CPI and OEP show a positive correlation with the altitude in Taraxacum mongolicum, however, the correlation changes irregularly for Leontopodium leontopodioidie.
出处 《世界地质》 CAS CSCD 2011年第3期469-473,共5页 World Geology
基金 中国科学院战略性先导科技专项(XDA05130402) 国家自然科学基金项目(40772112 40302024 40802038)联合资助
关键词 高寒草甸 烷烃 海拔 蒲公英 火绒草 alpine meadow n-alkane altitude Leontopodium leontopodioidie Taraxacum mongolicum
作者简介 通讯作者:李玉梅(1974-),女,副教授,主要从事第四纪与地球化学研究.E-mail:liym@gucas.ac.cn
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