黄土高原西部地区现代木本植被叶片正构烷烃分布模式

Distribution of n-alkane in modern ligneous plants from the western loess plateau

采集黄土高原西部地区常见8种乔木及3种灌木植物叶片,利用气象色谱分析,开展现代木本植物叶片正构烷烃主峰分布的研究.结果发现:黄土高原西部地区常见8种乔木植物正构烷烃的主峰分布均以C27或C29为主峰,5种灌木植物中3种以C29为主峰,2种以C31为主峰.乔木植物叶片正构烷烃的分布与前人沉积物中木本植物的研究成果较为一致,灌木植物叶片存在一定的差异.同时研究区3种常见松科植物C31含量相对较高,但均仍以C29为主峰,表现出木本植物叶片正构烷烃的分布模式,并无C31为主峰的分布.

The distribution model of n-alkanes in modern ligneous plants was analysed with GC on eight arbor species and three shrub species collected in the western loess plateau.The arbor species showed heavy-molecularweight （HMW） homologues of the n-alkane distribution with the main peak being C 27 or C 29,while three of the shrub species showed HMW homologue distributions with the main peak of C 29.And the rest two species showed HMW homologue distributions with the main peak of C 31.The arbor plant leaves with the distribution of normal alkanes produced research results that were consistent with those of the woody plants in sediments and there existed certain differences for shrub plant leaves.In the research area,three kinds of conifer showed that the C 31 content was opposite to each other,but still with C 29 peaks,and that the wood plants had the main peak of C 29 but not C 31.