干旱区生态环境知识资源中心(Arid): 银川盆地35.0ka以来古植被演化的类脂分子记录

Arid

	银川盆地35.0ka以来古植被演化的类脂分子记录
其他题名	Regional Paleovegetation Evolution Recorded in Molecular Lipid of Fluvial - lacustrine Sediments the Yinchuan Basin Since 35.0ka
	张慧娟 1; 杨桂芳 1; 陈正洪 2
来源期刊	地质与勘探
ISSN	0495-5331
出版年	2019
卷号	55 期号:1 页码:152-159
中文摘要	为了更好地了解干旱-半干旱区的植被类型及其演化规律,利用气相色谱仪对银川盆地冰沟剖面河湖相沉积物中的正构烷烃进行了检测,结果显示其正构烷烃碳数分布范围为C_(15) ~ C_(34), 奇碳优势明显,以C29或C_31为主峰的单峰型为主,但少量样品也出现双峰型分布模式。通过对冰沟剖面正构烷烃分布特征、碳优势指数CPI和L/H(SigmaC_(21) - /SigmaC_(22 +))指标的详细分析,得知其有机质来源以陆生高等植物占主导优势。结合年代数据、有机碳同位素、长链正构烷烃平均链长ACL和C_(33) /(C_(33) + C_(27))值,重建出35.0ka以来银川盆地植被类型以C_3植物为主,并且C_3和C_4植物的相对比例变化主导受温度制约,而木本和草本植被的演化主要受控于水分条件。
英文摘要	By the aid of GC method,n - alkanes have been identified fluvial - lacustrine sediments from the Binggou profile of the Yinchuan basin, Ningxia, to characterize the palaeovegetation types and evolutions in arid and semi - arid regions. The results show that the n - alkanes with carbon numbers ranging from C_(15) to C_(34) exhibit different distribution patterns. Most samples show a single peak with high carbons(C29 or C_31 in particular) and have an odd - over - even carbon number predominance,while others have double peaks(the first peak is lower homologue and the second peak is high carbon). The distributions of n - alkanes,CPI and L /H values show that the organic matter in the Binggou profile primarily comes from terrestrial. According to OSL sequence, organic carbon isotope,ACL, and C_(33) /(C_(33) + C_(27)), the relative contents of C_4 plants and the evolution of herbs and woody plants have been reconstructed in the study area since 35.0ka. As a result,C_3 plants in the Yinchuan basin have great dominance and the changes of C_3 and C_4 plants are constrained by temperature,while the evolution of woody and herbaceous vegetation is mainly controlled by moisture.
中文关键词	正构烷烃 ; 有机碳同位素 ; 有机质来源 ; 古植被演化 ; 银川盆地
英文关键词	n - alkane organic carbon isotope organic source,paleovegetation,Yinchuan basin
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:6418741
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/239041
作者单位	1.中国地质大学(北京)地球科学与资源学院, 北京 100083, 中国; 2.中国气象局气象干部培训学院, 北京 100081, 中国
推荐引用方式 GB/T 7714	张慧娟,杨桂芳,陈正洪. 银川盆地35.0ka以来古植被演化的类脂分子记录[J],2019,55(1):152-159.
APA	张慧娟,杨桂芳,&陈正洪.(2019).银川盆地35.0ka以来古植被演化的类脂分子记录.地质与勘探,55(1),152-159.
MLA	张慧娟,et al."银川盆地35.0ka以来古植被演化的类脂分子记录".地质与勘探 55.1(2019):152-159.