干旱区生态环境知识资源中心(Arid): Origin, distribution and enrichment of selenium in oasis farmland of Aksu, Xinjiang, China

Arid

DOI	10.1016/j.gexplo.2021.106723
	Origin, distribution and enrichment of selenium in oasis farmland of Aksu, Xinjiang, China
	Lei, Wanshan; Cicchella, Domenico; Liu, Tuo; Yang, Shengfei; Zhou, Yongheng; Hu, Bo; Liu, Yunhua; Lin, Xin
通讯作者	Lin, X (corresponding author), Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China. ; Zhou, YH (corresponding author), China Geol Survey, Shenyang Ctr Geol Survey, Shenyang 130034, Peoples R China.
来源期刊	JOURNAL OF GEOCHEMICAL EXPLORATION
ISSN	0375-6742
EISSN	1879-1689
出版年	2021
卷号	223
英文摘要	This study aims to investigate the selenium (Se) distribution in the soils of the vast cultivated areas of Aksu Prefecture in mid-Western Xinjiang of Northwest China. The study of the origin and enrichment mechanism of Se in the soils of alluvial fans of these areas (also known as oasis areas) are of great importance for the conservation and development of Se-rich resources. Geological genetic analyses and elemental abundance comparisons confirmed that the Se-rich basement rocks (i.e., the Xiyu Group) are the primary source material of Se in the oasis farmlands. The study, carried out on samples taken along two transects that cross each other, showed that, from the peripheral to the core farmland of the investigated area, the Se concentration increases significantly, accompanied by a decrease in pH and increases in organic matter and clay particles. The peripheral farming land in Aksu showed low median Se concentration of 0.19 mg/kg that represent the regional soil background, high alkalinity (pH = 8.1-9.4), high silica content (SiO2 = 47.8-72.0 wt%) and low organic matter content (OrgC = 0.17-0.76 wt%). The core farming land, representing the intensely cultivated farmland, showed a median Se content of 0.56 mg/kg, and is characterized by low alkalinity (pH = 7.3-8.5) and silica content (SiO2 = 33.5-52.5 wt%), and is rich in organic matter (OrgC = 0.87-9.8 wt%). Based on the vertical soil section investigation, we found that the soil mineralogical and geochemical variations from the deep to the shallow soil layers is similar to that from the peripheral to the core farming land. Thanks to soil acidification and accumulation of organic matters and clay particles, the oasis-type farming activities transfer Se from the Se-enriched parts of the peripheral farming land and the deep soil layers to the upper soil layers of the core farming land. This Se-enrichment mechanism made the core farming land and its topsoil the most Se-rich part of the investigated area.
英文关键词	Agricultural soil Selenium Element migration Farming activities Arid area Northwest China
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000620235600004
WOS关键词	AGRICULTURAL SOILS ; WATER CHEMISTRY ; ORGANIC-MATTER ; HEBEI PROVINCE ; ADSORPTION ; SPECIATION ; GEOCHEMISTRY ; MECHANISMS ; DISTRICT ; AREA
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350825
作者单位	[Lei, Wanshan; Hu, Bo; Liu, Yunhua; Lin, Xin] Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China; [Cicchella, Domenico] Univ Sannio, Dept Sci & Technol, I-82100 Benevento, Italy; [Liu, Tuo; Yang, Shengfei] China Geol Survey, Xian Ctr Geol Survey, Xian 710054, Peoples R China; [Zhou, Yongheng] China Geol Survey, Shenyang Ctr Geol Survey, Shenyang 130034, Peoples R China
推荐引用方式 GB/T 7714	Lei, Wanshan,Cicchella, Domenico,Liu, Tuo,et al. Origin, distribution and enrichment of selenium in oasis farmland of Aksu, Xinjiang, China[J],2021,223.
APA	Lei, Wanshan.,Cicchella, Domenico.,Liu, Tuo.,Yang, Shengfei.,Zhou, Yongheng.,...&Lin, Xin.(2021).Origin, distribution and enrichment of selenium in oasis farmland of Aksu, Xinjiang, China.JOURNAL OF GEOCHEMICAL EXPLORATION,223.
MLA	Lei, Wanshan,et al."Origin, distribution and enrichment of selenium in oasis farmland of Aksu, Xinjiang, China".JOURNAL OF GEOCHEMICAL EXPLORATION 223(2021).