干旱区生态环境知识资源中心(Arid): Stable isotope compositions, sources and paleoenvironmental significance of Holocene calcareous root tubes in the Tengger Desert, Northwest China

Arid

DOI	10.1016/j.catena.2020.104846
	Stable isotope compositions, sources and paleoenvironmental significance of Holocene calcareous root tubes in the Tengger Desert, Northwest China
	Gao, Youhong; Li, Zhuolun; Zhu, Ruixia; Liao, Hao
通讯作者	Li, ZL
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2020
卷号	195
英文摘要	Valuable archives of paleoenvironmental changes are scarce in the hinterlands of deserts. Calcareous root tubes (CRTs), a form of pedogenic carbonate, are widely distributed in the hinterland of the Tengger Desert, Northwest China. The investigations of delta C-13 and delta O-18 values within CRTs from the Tengger Desert have a great potential to provide new significant archives for paleoenvironmental reconstructions in this area. In this study, 30 CRT samples from the Tengger Desert were collected. All the samples were described using cathodoluminescence (CL), and their delta C-13 and delta O-18 values were measured. The results revealed that limited marine carbonate was incorporated in the CRTs in the Tengger Desert and delta C-13 and delta O-18 values of the inner belt of the CRTs were not affected by recrystallization. Therefore, delta C-13 and delta O-18 values of the CRTs could accurately record environmental conditions in the Tengger Desert. The carbon source of the CRTs was a mixture of soil CO2 derived from root respiration and atmospheric CO2. Furthermore, delta C-13 values of most samples were lower than - 3.0%, indicating that C-3 vegetation was the main vegetation in the Tengger Desert during the middle and late Holocene. Moreover, delta O-18 values of the CRTs were ultimately inherited from summer precipitation. Influenced by the 'amount effect' in summer and strong evaporation, the lower delta O-18 values of the CRTs revealed that relatively higher effective moisture occurred from 7 to 4 cal kyr BP while the higher delta O-18 values indicated that relatively lower effective moisture occurred from 4 to 2 cal kyr BP in the Tengger Desert. The Holocene millennial-scale moisture changes in the hinterland of the Tengger Desert suggest an arid early Holocene (11.7-7 cal kyr BP), a relatively humid mid-Holocene (7-4 cal kyr BP), and a humid to arid late Holocene (4-2 cal kyr BP). The discrepancy of effective moisture change reconstruction based on the CRTs in the Tengger Desert and adjacent lake sediments during the early Holocene demonstrated that the reliability of the reconstructed results from lake sediments during this period needs further investigation.
英文关键词	Rhizoliths Pedogenic carbonate Stable isotope Paleoenvironment Holocene Desert
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000580366300066
WOS关键词	QUATERNARY ENVIRONMENTAL-CHANGES ; PEDOGENIC CARBONATE ; ALASHAN PLATEAU ; LATE PLEISTOCENE ; OXYGEN ISOTOPES ; LAKE EVOLUTION ; SOIL CARBONATE ; NW CHINA ; CLIMATE ; RECORD
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
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/2XILL650/326966
作者单位	[Li, Zhuolun] Lanzhou Univ, Coll Earth & Environm Sci, Ctr Glacier & Desert Res, Lanzhou 730000, Peoples R China; China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
推荐引用方式 GB/T 7714	Gao, Youhong,Li, Zhuolun,Zhu, Ruixia,et al. Stable isotope compositions, sources and paleoenvironmental significance of Holocene calcareous root tubes in the Tengger Desert, Northwest China[J]. 兰州大学,2020,195.
APA	Gao, Youhong,Li, Zhuolun,Zhu, Ruixia,&Liao, Hao.(2020).Stable isotope compositions, sources and paleoenvironmental significance of Holocene calcareous root tubes in the Tengger Desert, Northwest China.CATENA,195.
MLA	Gao, Youhong,et al."Stable isotope compositions, sources and paleoenvironmental significance of Holocene calcareous root tubes in the Tengger Desert, Northwest China".CATENA 195(2020).