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| 临夏塬堡黄土地层S1古土壤中的正构烷烃及其古植被意义 | |
| 引用本文： | 王志远,谢树成,陈发虎.临夏塬堡黄土地层S1古土壤中的正构烷烃及其古植被意义[J].第四纪研究,2004,24(2):231-235. |
| 作者姓名： | 王志远 谢树成 陈发虎 |
| 作者单位： | 1. 中国科学院广州地球化学研究所有机地球化学国家重点实验室,广州,510640 2. 中国地质大学地球科学学院,武汉,430074 3. 兰州大学资源环境学院,兰州,730000 |
| 基金项目： | 国家自然科学基金项目 (批准号 :40 2 72 0 5 3 )，国土资源部地质调查局地层古生物中心项目(批准号 :2 0 0 113 90 0 0 72 )资助 |
| 摘 要： | 运用GCMS,对临夏S1古土壤剖面连续系统采集的18个有机地球化学样品进行分析研究的结果发现,所有样品的正构烷烃的高碳数部分均有显著的奇偶优势,CPI值达到5.0以上,并且以表征草本植物输入的正构烷烃C31为主峰。结合不同植被区现代土壤样品的分析结果,研究区正构烷烃特征表明即使在第四纪的气候最适宜期的末次间冰期,在甘肃临夏附近的黄土高原发育了草原植被景观。 |
| 关 键 词： | 正构烷烃 末次间冰期 草本植物 古土壤 塬堡 |
| 文章编号： | 1001-7410(2004)02-231-05 |
| 收稿时间： | 2003-05-20 |
| 修稿时间： | 2003年5月20日 |
n-ALKANE DISTRIBUTION AS INDICATOR FOR PALEO-VEGETATION AN EXAMPLE FROM YUANBAO S1 PALEOSOL IN LINXIA,GANSU PROVINCE |
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| Institution: | 1. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640; 2. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074; 3. College of Earth and Environment Sciences, Lanzhou University, Lanzhou 730000 |
| Abstract: | Lipid analysis of modern soils from various climato vegetation regions revealed that the carbon number distribution of n alkanes mainly from C 22 ～C 33 with odd over even predominance and peaking at C 31 in the grasslands, whilst at C 29 in the woodlands. Investigation of the Yuanbao S 1 paleosol profile in Linxia, Gansu province, showed that the n alkanes have the carbon number ranging from C 14 ～C 35 and maximizing at C 18 and C 31 with a strong odd over even predominance over the carbon number of C 22 . This kind of bimodal carbon distribution in S 1 paleosol is of a mixed origin that the small molecules dominated by C 18 are mainly from algae and bacteria, whilst the heavy molecular weight homologues (>C 22 ) are chiefly from plants. Interestly, the constant main peak of C 31 of >C 22 n alkanes in the S 1 paleosol implicated the occurrence of grass vegetation over the Loess Plateau in the region of Linxia during the last interglacier. |
| Keywords: | n-alkane last interglaciation grassy vegetation paleosol Yuanbao |
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