气候变化领域集成服务门户(CCPortal): Physicochemical properties of surface sediments in the Taklimakan desert, northwestern China, and their relationship with oasis-desert evolution

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DOI	10.1016/j.catena.2021.105751
	Physicochemical properties of surface sediments in the Taklimakan desert, northwestern China, and their relationship with oasis-desert evolution
	Liu, Bing; Sun, Aijun; Zhao, Hui; Fan, Yuxin; Yang, Linhai; Li, Yuan; Li, Sen; Wang, Keqi
通讯作者	Zhao, H (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, Lanzhou 730000, Peoples R China.
发表日期	2022
ISSN	0341-8162
EISSN	1872-6887
卷号	208
英文摘要	Oasis and desert are the dominant landscapes in arid and semi-arid regions, especially in northwestern China where the oasis-desert evolution mechanisms are important for understanding modern surface processes and future environmental evolution of the region. Nevertheless, the response of the physicochemical indicators of surface sediments to oasis-desert evolution is poorly studied and it is unclear how reliable these indicators are for paleoenvironmental reconstruction. A spatio-temporal approach consisting of measurements of surface-sediment grain-size, nutrient contents and elemental ratios was used to characterize a series of modern stages of oasis-desert evolution in the Taklimakan desert. The applicability of the indicators to two sequences of alternating fluviolacustrine-wetland and aeolian sand deposits in the same region was evaluated. The results show that the oasis sediments are characterized by high contents of fine-grained particle (End-Member 1, EM1), TOC (Total organic Carbon), TN (Total Nitrogen), and MgO/SiO2, and low values of the eluvial coefficient (SiO2/(MgO + CaO + K2O + Na2O)). By contrast, the desert sediments are characterized by high values of coarse-grained particle (End-Member 3, EM3), low soil nutrients and MgO/SiO2, and an increased eluvial coefficient. In the two sedimentary sections, the physicochemical properties of the clay-silt layers resemble those of modern oasis sediments, especially washland, and the properties of the interbedded aeolian sand resemble those of modern desert deposits. The observed co-variation of grain size, soil nutrients and geochemical ratios of the surface samples shows that our approach can be used to determine the trends of past oasis-desert evolution. The reconstruction suggests that oasis formation largely depended on the development of a fluviolacustrine-wetland environment, whereas oasis degradation was closely related to strong aeolian activity. The findings provide new insights into the selection of appropriate indicators for analyzing oasis-desert sediments and for reconstructing the evolution of oasis-desert landscapes.
关键词	ENVIRONMENTAL-CHANGES TAKLAMAKAN DESERT TARIM BASIN SOUTHERN MARGIN XINJIANG SOIL END OASES
英文关键词	Surface sediments; Spatio-temporal substitution; Oasis-desert evolution; Taklimakan desert
语种	英语
WOS研究方向	Geology ; Agriculture ; Water Resources
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS记录号	WOS:000708436100005
来源期刊	CATENA
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254014
作者单位	[Liu, Bing; Sun, Aijun; Zhao, Hui; Li, Yuan; Li, Sen; Wang, Keqi] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, Lanzhou 730000, Peoples R China; [Sun, Aijun] Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China; [Sun, Aijun] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Fan, Yuxin] Lanzhou Univ, Sch Earth Sci, Key Lab Mineral Resources Western China Gansu Pro, Lanzhou 730000, Peoples R China; [Yang, Linhai] Shaanxi Normal Univ, Sch Geog & Tourism, Xian 710062, Peoples R China
推荐引用方式 GB/T 7714	Liu, Bing,Sun, Aijun,Zhao, Hui,et al. Physicochemical properties of surface sediments in the Taklimakan desert, northwestern China, and their relationship with oasis-desert evolution[J]. 中国科学院西北生态环境资源研究院,2022,208.
APA	Liu, Bing.,Sun, Aijun.,Zhao, Hui.,Fan, Yuxin.,Yang, Linhai.,...&Wang, Keqi.(2022).Physicochemical properties of surface sediments in the Taklimakan desert, northwestern China, and their relationship with oasis-desert evolution.CATENA,208.
MLA	Liu, Bing,et al."Physicochemical properties of surface sediments in the Taklimakan desert, northwestern China, and their relationship with oasis-desert evolution".CATENA 208(2022).