干旱区生态环境知识资源中心(Arid): 东、中亚干旱--半干旱区全新世湖泊沉积w(TOC)与delta~(13)C

Arid

	东、中亚干旱--半干旱区全新世湖泊沉积w(TOC)与delta~(13)C_(org)意义的阈值问题
其他题名	Threshold problem of TOC mass fraction and delta~(13)C_(org) from Holocene lake sediments in arid and semi-arid regions of East and Central Asia
	周雪花; 李育; 张成琦; 王岳
来源期刊	兰州大学学报. 自然科学版
ISSN	0455-2059
出版年	2015
卷号	51 期号:1 页码:37-43
中文摘要	选择了东、中亚干旱--半干旱区14个湖泊全新世沉积物的w(TOC)和delta~(13)C_(org)纪录,探讨了TOC及其不同沉积阶段对delta~(13)C_(org)变化的影响及两者的关系,为delta~(13)C_(org)在古气候研究中的正确使用提供依据.结果表明:湖泊沉积物delta~(13)C_(org)的变化在一定程度上受控于w(TOC).该区域湖泊沉积物w(TOC)相对于delta~(13)C_(org)变化存在相应阈值,不同阈值区间代表TOC的不同沉积模式,不同沉积模式下w(TOC)和delta~(13)C_(org)的关系不同. w(TOC)较低或较高时,两者均无对应关系,可能是有机质受到不稳定的沉积环境影响;不同湖泊主导有机碳沉积的模式不同; delta~(13)C_(org)在相应TOC的重沉积埋藏模式下可能与气候变化有关,因此在利用delta~(13)C_(org)解释气候变化时应结合有机质沉积阶段进行分析.
英文摘要	14 TOC mass fraction and delta~(13)C_(org) records were selected from lake sediments in arid and semi-arid regions of East and Central Asia, and the TOC mass fraction and the impact of delta~(13)C_(org) changes in their different deposition stages and their relationships were studied, which could provide a basis for the proper use of delta~(13)C_(org) in palaeoclimate research. The results showed that the changes in lake sediments delta~(13)C_(org) had been controlled by the TOC mass fraction to a certain extent. The TOC mass fraction and the corresponding variations of delta~(13)C_(org) possessed corresponding thresholds in those regions. Different threshold ranges represented different depositional patterns of TOC and the relationship between TOC mass fraction and delta~(13)C_(org) were different in different depositional models. When the TOC mass fraction became lower or higher, no correspondence between them occurred, probably organic matter was affected by an unstable sedimentary environment. Different deposition patterns of lakes might have caused the organic carbons to be different.delta~(13)C_(org) might be related to climate changes under the buried model of organic matter. Therefore, using delta~(13)C_(org) to explain climate changes should be combined with data about the sedimentary stage of organic matter.
中文关键词	湖泊沉积 ; 总有机碳 ; 有机碳同位素 ; 全新世 ; 干旱区--半干旱区
英文关键词	lake sediment TOC delta~(13)C_(org) Holocene arid and semi-arid region
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:5528206
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232961
作者单位	兰州大学资源环境学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	周雪花,李育,张成琦,等. 东、中亚干旱--半干旱区全新世湖泊沉积w(TOC)与delta~(13)C_(org)意义的阈值问题[J]. 兰州大学,2015,51(1):37-43.
APA	周雪花,李育,张成琦,&王岳.(2015).东、中亚干旱--半干旱区全新世湖泊沉积w(TOC)与delta~(13)C_(org)意义的阈值问题.兰州大学学报. 自然科学版,51(1),37-43.
MLA	周雪花,et al."东、中亚干旱--半干旱区全新世湖泊沉积w(TOC)与delta~(13)C_(org)意义的阈值问题".兰州大学学报. 自然科学版 51.1(2015):37-43.