气候变化领域集成服务门户(CCPortal): 临夏螈堡黄土地层S_1古土壤中的正构烷烃及其古植被意义

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	临夏螈堡黄土地层S_1古土壤中的正构烷烃及其古植被意义
其他题名	n-Alkane distributio as indicator for paleo-vegetation an Example form yuanbao S_1 Paleosol in linxia,gansu prvince
	王志远; 谢树成; 陈发虎
发表日期	2004
ISSN	1001-7410
卷号	24 期号:2 页码:231-235
中文摘要	运用GC-MS，对临夏S_1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 C_(31)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。
英文摘要	Iipid 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 re-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) rc-alkanes in the S_1 paleosol implicated the oc currence of grass vegetation over the Loess Plateau in the region of Linxia during the last interglacier.
关键词	正构烷烃
英文关键词	n-alkane
语种	中文
WOS研究方向	Geology
WOS类目	GEOLOGY
CSCD记录号	CSCD:1635266
来源期刊	第四纪研究
来源机构	兰州大学 ; 中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/1847
推荐引用方式 GB/T 7714	王志远,谢树成,陈发虎. 临夏螈堡黄土地层S_1古土壤中的正构烷烃及其古植被意义[J]. 兰州大学, 中国科学院青藏高原研究所,2004,24(2):231-235.
APA	王志远,谢树成,&陈发虎.(2004).临夏螈堡黄土地层S_1古土壤中的正构烷烃及其古植被意义.第四纪研究,24(2),231-235.
MLA	王志远,et al."临夏螈堡黄土地层S_1古土壤中的正构烷烃及其古植被意义".第四纪研究 24.2(2004):231-235.