Combined effects of damming and drought on nitrogen dynamics in an ephemeral river of North China

doi:10.1016/j.jclepro.2022.133940

	Combined effects of damming and drought on nitrogen dynamics in an ephemeral river of North China
	Jiang, Dejuan 1,3; Li, Zhi 2; Xia, Yun 1,2; Li, Yuan 1,3; Luo, Yongming 1,4
发表期刊	JOURNAL OF CLEANER PRODUCTION
ISSN	0959-6526
	2022-11-01
卷号	373 页码:10
关键词	Nitrogen cycles Spatiotemporal variation Nitrate isotopes Nitrogen pollution risk Heavily dammed river
DOI	10.1016/j.jclepro.2022.133940
英文摘要	Damming and drought have dramatically altered water cycle dynamics in rivers, which further affects nitrogen biogeochemical cycles; however, their combined effects have rarely been studied, especially for ephemeral rivers with variable water flows. Taking the Dagu River of North China as the study area, we examined the spatiotemporal variability of nitrogen in river water and its relation to damming and drought. The total nitrogen (TN), dissolved inorganic nitrogen (DIN) and NO3- concentrations varied significantly in space and time, but the NH4+ and NO2- concentrations changed little. Spatially, compared with the upper reaches, the TN, DIN and NO3- concentrations in the lower reaches decreased by 71%, 81% and 85%, respectively, which was concurrent with the isotopic enrichment of nitrate. Temporally, their concentrations in dry seasons were more than twice of wet seasons, and increased from 2018 (normal year) to 2019 (dry year). The cascade dams may promote the NO3- removal towards the lower reaches through assimilation, which combined with nitrification and strong evaporation to enhance delta O-18-NO3- enrichment and disproportionate delta N-15-NO3-/delta O-18-NO3- ratio. Further, the damming effects can be aggravated by droughts because of no flow, extended nitrogen residence time and increased groundwater discharge with higher nitrogen contents, which jointly elevated the nitrogen level. Hence, the combined effects of damming and drought should be fully considered for management of water environment and resources in regions with ephemeral rivers.
收录类别	SCI
语种	英语
关键词[WOS]	DUAL-ISOTOPE APPROACH ; NITRATE SOURCES ; UNCERTAINTY ANALYSIS ; MIXING MODEL ; STORM EVENTS ; IDENTIFICATION ; APPORTIONMENT ; IMPACTS ; BASIN
研究领域[WOS]	Science & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology
WOS记录号	WOS:000860448600002
引用统计
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/31732
专题	中国科学院海岸带环境过程与生态修复重点实验室中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
通讯作者	Luo, Yongming
作者单位	1.Chinese Acad Sci, Yantai Inst Coastal Zone Res, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Shandong, Peoples R China 2.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China 3.Shandong Key Lab Coastal Environm Proc, Yantai 264003, Shandong, Peoples R China 4.Chinese Acad Sci, Inst Soil Sci, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Dejuan,Li, Zhi,Xia, Yun,et al. Combined effects of damming and drought on nitrogen dynamics in an ephemeral river of North China[J]. JOURNAL OF CLEANER PRODUCTION,2022,373:10.
APA	Jiang, Dejuan,Li, Zhi,Xia, Yun,Li, Yuan,&Luo, Yongming.(2022).Combined effects of damming and drought on nitrogen dynamics in an ephemeral river of North China.JOURNAL OF CLEANER PRODUCTION,373,10.
MLA	Jiang, Dejuan,et al."Combined effects of damming and drought on nitrogen dynamics in an ephemeral river of North China".JOURNAL OF CLEANER PRODUCTION 373(2022):10.