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Tracing nitrate source and transformation in a semiarid loess aquifer with the thick unsaturated zone

文献类型：期刊论文

作者Ma, Baoqiang1,2; Huang, Tianming1,3; Li, Jie1; Li, Zhenbin1,3; Long, Yin1,3; Zhang, Fen1,3; Pang, Zhonghe1,3
刊名CATENA
出版日期2021-03-01
卷号198页码:7
关键词Loess Unsaturated zone Groundwater Nitrogen and oxygen isotopes of nitrate Denitrification
ISSN号0341-8162
DOI10.1016/j.catena.2020.105045
英文摘要The unsaturated zone (UZ) plays an important link between groundwater and the land surface. The surface pollutants would be retained firstly in the UZ when the UZ is thick and the recharge rate is limited before they percolate into groundwater. This study is dedicated to revealing the groundwater nitrate source and transformation by combining evaluations of the thick UZ (40-75 m) with the saturated zone in a loess aquifer using dual isotopic composition of nitrate from precipitation, soil water, and groundwater. According to the percolation velocity of soil water (0.12-0.14 m/yr), the depth above and below 10 m is taken as the shallow and deep part of the UZ, respectively. Results show that recent human activities have already caused nitrate pollution in the shallow part, which originated from chemical fertilizers, manure, and soil nitrogen. However, the nitrate in the deep part mainly originates from soil nitrogen. Denitrification in the shallow and deep part of the UZ is not evident. The groundwaters are all tritium-free (i.e., recharged before the 1950s), and therefore the water quality has not been affected by recent human activities. The groundwater nitrate concentration ranges from 6.5 mg/L to 19.2 mg/L with an average of 12.6 mg/L and mainly originates from the nitrification of soil nitrogen. Denitrification process is also not evident in groundwater, suggesting that the hydrogeological condition (especially the buffering effect of the thick UZ) controls the migration of nitrate. However, nitrate produced by human activities on the land surface would enter the aquifer eventually, posing a potential risk on water quality in the future.
WOS关键词GROUNDWATER NITRATE ; NORTH CHINA ; NITROGEN ; DENITRIFICATION ; ISOTOPE ; WATER ; CONTAMINATION ; ACCUMULATION ; OXYGEN ; TRANSPORT
资助项目Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0904] ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences[KLSG201703] ; National Natural Science Foundation of China[41672254] ; IAEA Project[RAS7035] ; Youth Innovation Promotion Association CAS[2018087] ; CAS scholarship[201825]
WOS研究方向Geology ; Agriculture ; Water Resources
语种英语
WOS记录号WOS:000605337000060
出版者ELSEVIER
资助机构Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; IAEA Project ; IAEA Project ; IAEA Project ; IAEA Project ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; CAS scholarship ; CAS scholarship ; CAS scholarship ; CAS scholarship ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; IAEA Project ; IAEA Project ; IAEA Project ; IAEA Project ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; CAS scholarship ; CAS scholarship ; CAS scholarship ; CAS scholarship ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; IAEA Project ; IAEA Project ; IAEA Project ; IAEA Project ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; CAS scholarship ; CAS scholarship ; CAS scholarship ; CAS scholarship ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; Science Foundation of the Key Laboratory of Shale Gas and Geoengineering of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; IAEA Project ; IAEA Project ; IAEA Project ; IAEA Project ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; CAS scholarship ; CAS scholarship ; CAS scholarship ; CAS scholarship
源URL[http://ir.iggcas.ac.cn/handle/132A11/100021]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Huang, Tianming
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
2.China Univ Min & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Ma, Baoqiang,Huang, Tianming,Li, Jie,et al. Tracing nitrate source and transformation in a semiarid loess aquifer with the thick unsaturated zone[J]. CATENA,2021,198:7.
APA Ma, Baoqiang.,Huang, Tianming.,Li, Jie.,Li, Zhenbin.,Long, Yin.,...&Pang, Zhonghe.(2021).Tracing nitrate source and transformation in a semiarid loess aquifer with the thick unsaturated zone.CATENA,198,7.
MLA Ma, Baoqiang,et al."Tracing nitrate source and transformation in a semiarid loess aquifer with the thick unsaturated zone".CATENA 198(2021):7.

入库方式： OAI收割

来源：地质与地球物理研究所

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