干旱区生态环境知识资源中心(Arid): Biogeomorphology of nebkhas in the Mu Us dune field, north-central China: Chronological and morphological results

Arid

DOI	10.1016/j.geomorph.2021.107979
	Biogeomorphology of nebkhas in the Mu Us dune field, north-central China: Chronological and morphological results
	Li, Shihan; Mason, Joseph A.; Xu, Yihong; Xu, Chi; Zheng, Guang; Li, Jinchang; Yizhaq, Hezi; Pan, Shaoming; Lu, Huayu; Xu, Zhiwei
通讯作者	Xu, ZW (corresponding author), Nanjing Univ, Sch Geog & Ocean Sci, Nanjing 210023, Peoples R China.
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2021
卷号	394
英文摘要	Nebkhas, also known as nebkha dunes or coppice dunes, are a unique biogeomorphological aeolian landform that is common in arid and semi-arid regions. They are often regarded as a signal of regional desertification and could be potential dust sources due to their relatively large content of fine sediments, but they also serve as fertile islands that enhance biodiversity at a micro-habitat. How the interactions between plant growth and aeolian sand deposition affect the formation and development of nebkhas has not been well documented, though. In this study, the chronology and morphological features of nebkhas in the Mu Us dune field, north-central China were studied using radionuclide (Cs-137) dating and unmanned aerial vehicle (UAV) photogrammetric survey. The results show that the nebkhas are mainly distributed around lake basins and dry river valleys with relatively flat topography. Most nebkhas have heights around 0.5-1.5 m, and according to a new integrated age-height model, they mostly formed in the last fifty years. Widespread nebkha growth over that time is interpreted as a response to both desiccation of lake beds and river valleys and a pronounced decline in strong wind frequency. The regular rounded shape of the nebkhas in the study area may reflect the growth form of prostrate, extensively branched Nitraria tangutorum, the dominant formative shrub, and response to the low-energy wind environment. A nebkha's height and horizontal length increase synchronously in the early stage of the development, while the increase in horizontal length and projected area accelerates when the dunes become larger. Feedbacks involving both aeolian sand transport and shrub growth can explain a decline in growth rate with increasing height and an apparent height limit of about 4 m. This study also implies that nebkhas are important biogeomorphological features demonstrating how biotic and abiotic interactions can shape landforms and influence ecological functioning in arid and semi-arid environments. (C) 2021 Elsevier B.V. All rights reserved.
英文关键词	Nebkhas Biogeomorphological processes Aeolian sand accumulation Growth limit Cs-137 dating UAV photogrammetry
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000706990500004
WOS关键词	VEGETATION COVER ; LAND DEGRADATION ; SAND TRANSPORT ; WIND EROSION ; DESERT ; SEDIMENTS ; DYNAMICS ; LAKE ; INDICATORS ; MOBILITY
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
来源机构	南京大学 ; Ben-Gurion University of the Negev
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363428
作者单位	[Li, Shihan; Pan, Shaoming; Lu, Huayu; Xu, Zhiwei] Nanjing Univ, Sch Geog & Ocean Sci, Nanjing 210023, Peoples R China; [Mason, Joseph A.] Univ Wisconsin, Dept Geog, Madison, WI 53706 USA; [Xu, Yihong] Anhui Normal Univ, Sch Geog & Tourism, Wuhu 241003, Peoples R China; [Xu, Chi] Nanjing Univ, Sch Life Sci, Nanjing 210023, Peoples R China; [Zheng, Guang] Nanjing Univ, Int Inst Earth Syst Sci, Nanjing 210023, Peoples R China; [Li, Jinchang] Shanxi Univ, Inst Loess Plateau, Taiyuan 030006, Peoples R China; [Yizhaq, Hezi] Ben Gurion Univ Negev, Dept Solar Energy & Environm Phys, BIDR, Midreshet Ben Gurion, Israel
推荐引用方式 GB/T 7714	Li, Shihan,Mason, Joseph A.,Xu, Yihong,et al. Biogeomorphology of nebkhas in the Mu Us dune field, north-central China: Chronological and morphological results[J]. 南京大学, Ben-Gurion University of the Negev,2021,394.
APA	Li, Shihan.,Mason, Joseph A..,Xu, Yihong.,Xu, Chi.,Zheng, Guang.,...&Xu, Zhiwei.(2021).Biogeomorphology of nebkhas in the Mu Us dune field, north-central China: Chronological and morphological results.GEOMORPHOLOGY,394.
MLA	Li, Shihan,et al."Biogeomorphology of nebkhas in the Mu Us dune field, north-central China: Chronological and morphological results".GEOMORPHOLOGY 394(2021).