Mineral N stock and nitrate accumulation in the 50 to 200 m profile on the Loess Plateau

doi:10.1016/j.scitotenv.2018.03.249

	Mineral N stock and nitrate accumulation in the 50 to 200 m profile on the Loess Plateau
	Jia, Xiaoxu 1,2,3; Zhu, Yuanjun 3; Huang, Laiming 1,2,3; Wei, Xiaorong 3; Fang, Yunting 4; Wu, Lianhai 5; Binley, Andrew 6; Shao, Mingan 1,2,3
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2018-08-15
卷号	633 页码:999-1006
关键词	Nitrate Ammonium Nitrate accumulation Critical zone The Loess Plateau
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2018.03.249
通讯作者	Zhu, Yuanjun(zhuyj@nwsuaf.edu.cn) ; Shao, Mingan(shaoma@igsnrr.ac.cn)
英文摘要	Nitrogen (N) stored in deep profiles is important in assessing regional and/or global N stocks and nitrate leaching risk to groundwater. The Chinese Loess Plateau, which is characterized by significantly thick loess deposits, potentially stores immense stocks of mineral N, posing future threats to groundwater quality. In order to determine the vertical distributions of nitrate and ammonium content in the region, as well as to characterize the potential accumulation of nitrate in the deep loess profile, we study loess samples collected at five sites (Yangling, Changwu, Fuxian, An'sai and Shenmu) through a 50 to 200 m loess profile. The estimated storage of mineral N varied significantly among the five sites, ranging from 0.46 to 2.43 x 10(4) kg N ha(-1). Ammonium exhibited fluctuations and dominated mineral N stocks within the whole profile at the sites, except for the upper 20-30 m at Yangling and Changwu. Measured nitrate content in the entire profile at Fuxian, An'sai and Shenmu is low, but significant accumulations were observed to 30-50 m depth at the other two sites. Analysis of delta N-15 and delta O-18 of nitrate indicates different causes for accumulated nitrate at these two sites. Mineralization and nitrification of manure and organic N respectively contribute nitrate to the 0-12 and 12-30 m profile at Changwu; while nitrification of NH4+ fertilizer, NO3- fertilizer and nitrification of organic N control the nitrate distribution in the 0-3, 3-7 and 7-10 m layer at Yangling, respectively. Furthermore, our analysis illustrates the low denitrification potential in the lower part of the vadose zone. The accumulated nitrate introduced by human activities is thus mainly distributed in the upper vadose zone (above 30 m), indicating, currently, a low nitrate leaching risk to groundwater due to a high storage capacity of the thick vadose zone in the region. (C) 2018 Published by Elsevier B.V.
资助项目	National Natural Science Foundation of China[41571130081] ; NERC Newton Fund through the China-UK collaborative research on critical zone science[NE/N007433/1] ; NERC Newton Fund through the China-UK collaborative research on critical zone science[NE/N007409/1] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2017076] ; Youth Innovation Research Team Project[LENOM2016Q0001]
WOS关键词	NORTH CHINA PLAIN ; ISOTOPE FRACTIONATION ; GLOBAL PATTERNS ; SOIL PROFILES ; VADOSE ZONE ; NITROGEN ; WATER ; GROUNDWATER ; DESERT ; CONTAMINATION
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000432475300096
资助机构	National Natural Science Foundation of China ; NERC Newton Fund through the China-UK collaborative research on critical zone science ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Research Team Project
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/54766]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhu, Yuanjun; Shao, Mingan
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 3.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 4.Chinese Acad Sci, Inst Appl Ecol, Key Lab Forest Ecol & Management, Shenyang 110016, Liaoning, Peoples R China 5.Rothamsted Res, Okehampton EX20 2SB, Devon, England 6.Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England
推荐引用方式 GB/T 7714	Jia, Xiaoxu,Zhu, Yuanjun,Huang, Laiming,et al. Mineral N stock and nitrate accumulation in the 50 to 200 m profile on the Loess Plateau[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,633:999-1006.
APA	Jia, Xiaoxu.,Zhu, Yuanjun.,Huang, Laiming.,Wei, Xiaorong.,Fang, Yunting.,...&Shao, Mingan.(2018).Mineral N stock and nitrate accumulation in the 50 to 200 m profile on the Loess Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,633,999-1006.
MLA	Jia, Xiaoxu,et al."Mineral N stock and nitrate accumulation in the 50 to 200 m profile on the Loess Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 633(2018):999-1006.