干旱区生态环境知识资源中心(Arid): Contribution of underlying terrain to sand dunes: evidence from the Qaidam Basin, Northwest China

Arid

DOI	10.1007/s40333-021-0028-y
	Contribution of underlying terrain to sand dunes: evidence from the Qaidam Basin, Northwest China
	Li Jiyan; Qu Xin; Dong Zhibao; Cai Yingying; Liu Min; Ren Xiaozong; Cui Xujia
通讯作者	Li, JY (corresponding author)，Taiyuan Normal Univ, Sch Geog Sci, Jinzhong 030619, Peoples R China.
来源期刊	JOURNAL OF ARID LAND
ISSN	1674-6767
EISSN	2194-7783
出版年	2021
卷号	13 期号:12 页码:1215-1229
英文摘要	Underlying terrain strongly influences dune formation. However, the impacts of underlying terrain on the dune formation are poorly studied. In the present research, we focused on dunes that formed in the alluvial fans and dry salt flats in the Qaidam Basin, Northwest China. We quantified the dunes' sediment characteristics on different types of underlying terrain and the terrain' effects on the surface quartz grains by analyzing grain-size distribution, soluble salt contents and grain surface micro-textures. Results showed that barchan dunes were dominated by medium sands with a unimodal frequency distribution, whose peak corresponded to the saltation load. Linear dunes were mainly composed of fine sands with a bimodal frequency distribution, whose main peak represented the saltation load, and whose secondary peak represented the modified saltation or suspension load. Sand was transported from source area by running water (inland rivers) over short distances and by wind over relatively longer distances. Thus, quartz grains had poor roundness and were dominated by sub-angular and angular shapes. Surface micro-textures indicated that dune sands were successively transported by exogenic agents (glaciation, fluviation and wind). Soluble salt contents were low in dunes that developed in the alluvial fans, which represented a low-energy chemical environment, so the grain surface micro-textures mainly resulted from mechanical erosion, with weak micro-textures formed by SiO2 solution and precipitation. However, soluble salt contents were much higher in dunes that developed in the dry salt flats, which indicated a high-energy chemical environment. Therefore, in addition to micro-structures caused by mechanical erosion, micro-textures formed by SiO2 solution and precipitation also well developed. Our results improve understanding of the sediment characteristics of dune sands and the effects of underlying terrain on dune development in the Qaidam Basin, China.
英文关键词	dune grain-size distribution soluble salts surface micro-texture Qaidam Basin
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000739274500003
WOS关键词	LINEAR DUNES ; AEOLIAN SEDIMENTS ; OSL CHRONOLOGY ; DESERT ; PROVENANCE ; DEPOSITS ; LAKE
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/375647
作者单位	[Li Jiyan; Qu Xin; Cai Yingying; Liu Min; Ren Xiaozong; Cui Xujia] Taiyuan Normal Univ, Sch Geog Sci, Jinzhong 030619, Peoples R China; [Dong Zhibao] Shaanxi Normal Univ, Sch Geog & Tourism, Xian 710119, Peoples R China
推荐引用方式 GB/T 7714	Li Jiyan,Qu Xin,Dong Zhibao,et al. Contribution of underlying terrain to sand dunes: evidence from the Qaidam Basin, Northwest China[J],2021,13(12):1215-1229.
APA	Li Jiyan.,Qu Xin.,Dong Zhibao.,Cai Yingying.,Liu Min.,...&Cui Xujia.(2021).Contribution of underlying terrain to sand dunes: evidence from the Qaidam Basin, Northwest China.JOURNAL OF ARID LAND,13(12),1215-1229.
MLA	Li Jiyan,et al."Contribution of underlying terrain to sand dunes: evidence from the Qaidam Basin, Northwest China".JOURNAL OF ARID LAND 13.12(2021):1215-1229.