干旱区生态环境知识资源中心(Arid): The effect of heavy rainfall events on nitrogen patterns in agricultural surface and underground streams and the implications for karst water quality protection

Arid

DOI	10.1016/j.agwat.2022.107600
	The effect of heavy rainfall events on nitrogen patterns in agricultural surface and underground streams and the implications for karst water quality protection
	Wang, Zhong-Jun; Yue, Fu-Jun; Wang, Yu-Chun; Qin, Cai-Qing; Ding, Hu; Xue, Li-Li; Li, Si-Liang
通讯作者	Yue, FJ
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2022
卷号	266
英文摘要	Special hydrological structures coupled with rainfall and agricultural activities have great impacts on water quality in karst areas. High-frequency hydro-chemical, dual nitrate isotopes and a Bayesian mixing model (SIAR) were employed to investigate the effect of heavy rainfall events on nitrogen patterns in surface and underground streams and explore the implications for nitrogen pollution prevention in a typical karst agricultural catchment in Southwest China. The results showed that [NO3--N] was relatively high in both surface and underground streams and the average value in surface stream was two times higher than in underground stream. The lowest [NO3--N] of underground stream was found in the falling limb of the hydrograph. According to source apportionment by SIAR, chemical fertilizer was the dominant nitrate source in the study area, which contributed 52-81% and 29-78% of nitrate in surface stream and underground stream, respectively. The highest dissolved inorganic nitrogen flux and [NO3--N] in surface stream was 5.7 times and 2.4 times higher, respectively, than in underground stream over the same period, which suggested that surface runoff rather than underground stream was the main mute of rapid nitrogen loss in the karst catchment during heavy rainfall events. Reasonably planning the fertilization time and optimizing nitrogen fertilizer use should be considered to decrease nitrogen loss from farmland. Rational use of a widespread karst underground conduit system to reduce water nitrogen content may also be a potential method for achieving nitrogen removal.
英文关键词	Nitrate patterns Karst agricultural catchment Rainfall events Nitrate isotopes Sources apportionment
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000892376200001
WOS关键词	ROCKY DESERTIFICATION ; NITRATE SOURCES ; INLAND WATER ; RIVER-BASIN ; GROUNDWATER ; DYNAMICS ; FLOW ; DISCHARGE ; STORAGE ; QUANTIFICATION
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/391604
推荐引用方式 GB/T 7714	Wang, Zhong-Jun,Yue, Fu-Jun,Wang, Yu-Chun,et al. The effect of heavy rainfall events on nitrogen patterns in agricultural surface and underground streams and the implications for karst water quality protection[J],2022,266.
APA	Wang, Zhong-Jun.,Yue, Fu-Jun.,Wang, Yu-Chun.,Qin, Cai-Qing.,Ding, Hu.,...&Li, Si-Liang.(2022).The effect of heavy rainfall events on nitrogen patterns in agricultural surface and underground streams and the implications for karst water quality protection.AGRICULTURAL WATER MANAGEMENT,266.
MLA	Wang, Zhong-Jun,et al."The effect of heavy rainfall events on nitrogen patterns in agricultural surface and underground streams and the implications for karst water quality protection".AGRICULTURAL WATER MANAGEMENT 266(2022).