Impacts of human activities on the occurrence of groundwater nitrate in an alluvial plain: A multiple isotopic tracers approach

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• 作者：Zhonghe Pang (1310)
  Lijuan Yuan (1310) (2310)
  Tianming Huang (1310)
  Yanlong Kong /a> (1310) (2310)
  Jilai Liu (3310)
  Yiman Li (1310) (2310)
  
• 关键词：nitrate ; alluvial plain ; environmental isotope ; fertilizer application ; groundwater exploitation
• 刊名：Journal of Earth Science
• 出版年：2013
• 出版时间：February 2013
• 年：2013
• 卷：24
• 期：1
• 页码：111-124
• 全文大小：727KB
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• 作者单位：Zhonghe Pang (1310)
  Lijuan Yuan (1310) (2310)
  Tianming Huang (1310)
  Yanlong Kong /a> (1310) (2310)
  Jilai Liu (3310)
  Yiman Li (1310) (2310)
  
  1310. Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
  2310. University of Chinese Academy of Sciences, Beijing, 100049, China
  3310. Hydrogeology and Engineering Geology Team of Beijing, Beijing, 100037, China
  
• ISSN：1867-111X

文摘

Nitrate pollution is a severe problem in areas with intensive agricultural activities. This study focuses on nitrate occurrence and its constraints in a selected alluvial fan using chemical data combined with environmental isotopic tracers (18O, 3H, and 15N). Results show that groundwater nitrate in the study area is as high as 258.0 mg/L (hereafter NO3 /sup>) with an average of 86.8 mg/L against national drinking water limit of 45 mg/L and a regional baseline value of 14.4 mg/L. Outside of the riparian zone, nitrate occurrence is closely related to groundwater circulation and application of chemical fertilizer. High groundwater nitrate is found in the recharge area, where nitrate enters into groundwater through vertical infiltration, corresponding to high 3H and enriched 18O in the water. In the riparian zone, on the contrary, the fate of groundwater nitrate is strongly affected by groundwater level. Based on two sampling transects perpendicular to the riverbank, we found that the high level of nitrate corresponds to the deeper water table (25 m) near the urban center, where groundwater is heavily extracted. Groundwater nitrate is much lower (<12.4 mg/L) at localities with a shallow water table (5 m), which is likely caused by denitrification in the aquifer.