| 论文题目: | Long chain n-alkanes and their carbon isotopes in lichen species from western Hubei Province: implication for geological records |
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| 作者: | Huang, XY; Xue, JT; Guo, SY |
| 联系作者: | Huang, XY |
| 刊物名称: | FRONTIERS OF EARTH SCIENCE |
| 期: | 1 |
| 卷: | 6 |
| 页: | 95-100 |
| 年份: | 2012 |
| 影响因子: | 0 |
| 论文下载: | |
| 摘要: | Five coticolous lichen samples were collected from western Hubei Province of China to analyze the long chain n-alkanes and their carbon isotope compositions. The n-alkanes range in carbon number from C-17 to C-33 with strong odd-over-even predominance between C-21 and C-33. Lichens are dominated by n-C-29 in the samples of Dajiuhu, Shennongjia Mountain, but by both n-C-23 and nC(29) at Qizimei Mountain. This difference may result from the different environmental conditions in these two sites. The delta C-13 values of long chain n-alkanes in lichen samples show the signature of C3 plants. Based on compound-specific carbon isotopic values and previous results, we state that alkane homologs>C-23 mainly originate from the symbiotic fungi, while symbiotic algae only contribute trace amount of long chain alkanes. Of great interesting is the occurrence of long chain 3-methylalkanes in the Qizimei samples. These anteiso compounds range from C-24 to C-32, displaying obvious even-over-odd predominance. This study reveals that the association of long chain 3-methylalkanes with n-C-23 alkane might be used as proxies to reconstruct the paleoecological implications of lichens in Earth history. |
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