干旱区生态环境知识资源中心(Arid): Sources and cycling processes of nitrogen revealed by stable isotopes and hydrochemistry in a typical agricultural lake basin

Arid

DOI	10.1016/j.apgeochem.2023.105662
	Sources and cycling processes of nitrogen revealed by stable isotopes and hydrochemistry in a typical agricultural lake basin
	Su, Chunli; Jiang, Jiaqi; Xie, Xianjun; Han, Zhantao; Wang, Mengzhu; Li, Junxia; Shi, Huijian
通讯作者	Han, ZT
来源期刊	APPLIED GEOCHEMISTRY
ISSN	0883-2927
EISSN	1872-9134
出版年	2023
卷号	156
英文摘要	Increased exposure to nitrate has been reported in many arid and semi-arid areas where groundwater is used as the drinking water source, presenting a major public health threat. Groundwater nitrate pollution is becoming serious due to intensive agricultural activities in the Nansi Lake Basin, Shandong Province, Northern China, through which the trunk line of the South-to-North Water Diversion Project passes. This study characterized potential nitrogen pollution sources by combined analysis of hydrochemical components and stable nitrate isotopes (d(15)N-NO3-, d(18)O-NO3- ); the contribution of different sources was estimated using the SIAR model. The results show groundwater nitrate contamination in the Nansi Lake Basin is widespread both west (NSW) and east (NSE) of the lake. Manure and sewage (M & S), soil nitrogen (SN), and chemical fertilizer (CF) are potential NO3? N sources in the study area, with the order of contribution being M & S (78.38%) > SN (15.02%) > CF (6.60%) in areas west of the lake and M & S (59.40%) > SN (30.38%) > CF (10.22%) in areas east of the lake, indicating the significant impact of human activities. The relationship between d-excess and d(15)N-NO3- suggests irrigation practices increase soil moisture, resulting in more N from N-15-depleted soils leaching into the groundwater, increasing the contribution of SN. The predominant processes of the nitrogen cycle in the basin are different in the NSW and NSE areas. In the upper-middle reaches of the NSW area, nitrification dominates the nitrogen cycle due to aerobic conditions and elevated salinity; however, denitrification occurs in local downstream aquifers at depths ranging from 10 to 50 m. In contrast, SN plays a bigger role in the NSE, where the mineralization of soil organic nitrogen is the predominant process, followed by nitrification of M & S and CF nitrogen sources due to rapid groundwater flow in the carbonate and metamorphic rock aquifers.
英文关键词	Hydrochemistry Stable isotopes SIAR model Nitrogen cycling Nansi lake basin
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001067129100001
WOS关键词	IDENTIFY NITRATE SOURCES ; LAND-USE AREAS ; CONTAMINANT SOURCES ; COMBINING ISOTOPES ; SURFACE-WATER ; MIXING MODEL ; RIVER-BASIN ; GROUNDWATER ; DENITRIFICATION ; OXYGEN
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/2XILL650/395344
推荐引用方式 GB/T 7714	Su, Chunli,Jiang, Jiaqi,Xie, Xianjun,et al. Sources and cycling processes of nitrogen revealed by stable isotopes and hydrochemistry in a typical agricultural lake basin[J],2023,156.
APA	Su, Chunli.,Jiang, Jiaqi.,Xie, Xianjun.,Han, Zhantao.,Wang, Mengzhu.,...&Shi, Huijian.(2023).Sources and cycling processes of nitrogen revealed by stable isotopes and hydrochemistry in a typical agricultural lake basin.APPLIED GEOCHEMISTRY,156.
MLA	Su, Chunli,et al."Sources and cycling processes of nitrogen revealed by stable isotopes and hydrochemistry in a typical agricultural lake basin".APPLIED GEOCHEMISTRY 156(2023).