干旱区生态环境知识资源中心(Arid): Source apportionment of nitrates in different aquifers in an arid region, northwestern China

Arid

DOI	10.1016/j.jclepro.2022.133969
	Source apportionment of nitrates in different aquifers in an arid region, northwestern China
	Qi, Shi; Feng, Qi; Zhu, Meng; Shu, Heping; Liu, Wei; Yang, Linshan; Yin, Zhenliang; Zhang, Chengqi
通讯作者	Qi, S
来源期刊	JOURNAL OF CLEANER PRODUCTION
ISSN	0959-6526
EISSN	1879-1786
出版年	2022
卷号	374
英文摘要	The nitrate pollution of groundwater in arid areas subject to human activity, and especially agricultural activity, is of immense environmental concern. Groundwater is the main water source in arid areas, once an aquifer is polluted, the impact upon the security of the water supply becomes all the more serious. The process of nitrate transformation is also different from that of humid areas, therefore, it is very important to identify and quantify the nitrate sources in aquifers. Using the hydrochemical, stable isotope tracers of 194 groundwater samples, and combining these with the MixSIAR model, the spatial distribution of groundwater nitrates in the Shiyang River Basin (SRB), China, was mapped. The relative contributions made by nitrate sources to different aquifers, and their key transformation processes, were identified. It was found that, shallow groundwater is seriously polluted, with NO3- concentrations ranging from 1.1 to 438.7 mg L-1. In the SRB, NO3- concentrations of 23% and 73% in shallow groundwater samples exceed the NO3- concentration limits found in natural sources (13.3 mg L-1), and the World Health Organization (WHO) nitrate limits for drinking water (50 mg L-1). Furthermore, the nitrates found in confined aquifers indicate that these are also affected by anthropogenic sources, with concentrations ranging from 1.6 to 44.7 mg L-1. Soil organic nitrogen (51.9%) and NH4+ fertilizer (20.8%), wastewater and manure (20.5%) are the main sources of groundwater nitrates; NO3- fertilizer (4.4%) and precipitation (2.3%) have a relatively insignificant effect on groundwater nitrates. The process of nitrification is the main factor affecting changes in nitrate concentrations in aquifers. Other than the denitrification observed in the shallow aquifers of the Minqin Basin (MQB), there was no significant denitrification in the other sub-basins of the SRB. Anthropogenic sources, especially agricultural sources, are now major contributors to the increases in groundwater nitrate concentrations observed in the SRB. This study provides data that can be used to help prevent groundwater pollution and enhance water resources management in arid areas.
英文关键词	Arid areas Shallow and confined aquifers Nitrate pollution Source apportionment Isotope technique
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000855238500002
WOS关键词	DUAL-ISOTOPE APPROACH ; LAND-USE ; GROUNDWATER RECHARGE ; UNCERTAINTY ANALYSIS ; NITROGEN POLLUTION ; STABLE-ISOTOPES ; MIXING MODEL ; DESERT ; WATER ; CONTAMINATION
WOS类目	Green & Sustainable Science & Technology ; Engineering, Environmental ; Environmental Sciences
WOS研究方向	Science & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393377
推荐引用方式 GB/T 7714	Qi, Shi,Feng, Qi,Zhu, Meng,et al. Source apportionment of nitrates in different aquifers in an arid region, northwestern China[J],2022,374.
APA	Qi, Shi.,Feng, Qi.,Zhu, Meng.,Shu, Heping.,Liu, Wei.,...&Zhang, Chengqi.(2022).Source apportionment of nitrates in different aquifers in an arid region, northwestern China.JOURNAL OF CLEANER PRODUCTION,374.
MLA	Qi, Shi,et al."Source apportionment of nitrates in different aquifers in an arid region, northwestern China".JOURNAL OF CLEANER PRODUCTION 374(2022).