干旱区生态环境知识资源中心(Arid): New insight into the response and transport of nitrate in karst groundwater to rainfall events

Arid

DOI	10.1016/j.scitotenv.2021.151727
	New insight into the response and transport of nitrate in karst groundwater to rainfall events
	Wang, Zhong-Jun; Yue, Fu-Jun; Lu, Ji; Wang, Yu-Chun; Qin, Cai-Qing; Ding, Hu; Xue, Li-Li; Li, Si-Liang
通讯作者	Yue, FJ
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2022
卷号	818
英文摘要	Although numerous studies focused on nitrate source, transformation and transport of river water in karst area have been reported, it's still unclear in understanding nitrate main source and transformation in karst groundwater system and how nitrate transport from soil to water during rainfall events in karst critical zone. In order to explore the response and transport of nitrate in karst groundwater to rainfall events, different depths of well water before, during and after rainfall event were sampled, and hillslope runoff, surface runoff of different land-use types during rainfall event were sampled synchronously at a typical karst agricultural catchment in Southwest China. Results showed that fluctuations of EC, pH and DO in deep borehole well (W1) and artesian well (W2) were small, on the contrary, variations of EC and DO in shallow well (W3) were large during sampling period. The nitrate concentrations and isotopic values indicated that nitrate in karst groundwater mainly originated from chemical fertilizer (CF), and influenced by denitrification process. High intensity of denitrification was observed in deep groundwater (87%) and artesian well water (almost 100%). Extremely high dual nitrate isotope values up to 46.8 +/- 1.5 parts per thousand and 24.7 +/- 0.5 parts per thousand were found in the deep artesian well. The small variation of water chemistry (EC, DO and pH), nitrate concentration and dual nitrate isotope values in deep wells during sampling period suggested that newly supplied nitrogen in deep groundwater during rainfall events also comes from deep groundwater. Low nitrogen concentrations in hillslope subsurface flow and surface runoff suggests that nitrogen transport process leading to increase of water nitrogen content mainly occur in depression. Nitrogen in depression soil is mainly transported to groundwater through fissures, fractures and conduits, rather than through vertical migration processes in the soil during rainfall events. (C) 2021 Elsevier B.V. All rights reserved.
英文关键词	Karst groundwater Nitrate response Denitrification Rainfall events
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000820264700013
WOS关键词	ROCKY DESERTIFICATION ; NITROGEN ; FLOW ; DYNAMICS ; DENITRIFICATION ; RUNOFF ; WATER ; VARIABILITY ; MECHANISMS ; DELTA-N-15
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/394350
推荐引用方式 GB/T 7714	Wang, Zhong-Jun,Yue, Fu-Jun,Lu, Ji,et al. New insight into the response and transport of nitrate in karst groundwater to rainfall events[J],2022,818.
APA	Wang, Zhong-Jun.,Yue, Fu-Jun.,Lu, Ji.,Wang, Yu-Chun.,Qin, Cai-Qing.,...&Li, Si-Liang.(2022).New insight into the response and transport of nitrate in karst groundwater to rainfall events.SCIENCE OF THE TOTAL ENVIRONMENT,818.
MLA	Wang, Zhong-Jun,et al."New insight into the response and transport of nitrate in karst groundwater to rainfall events".SCIENCE OF THE TOTAL ENVIRONMENT 818(2022).