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2022 Vol. 49, No. 2
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REN Kun, PAN Xiaodong, PENG Cong, LIANG Jiapeng, ZENG Jie, GAN Mingwei, ZHANG Hua, WEI Liangshuai. 2022. Identification of nitrate sources of groundwaters in the Zhaotong basin using hydrochemistry, nitrogen and oxygen isotopes and its impact on the environment[J]. Geology in China, 49(2): 409-419. doi: 10.12029/gc20220205
Citation: REN Kun, PAN Xiaodong, PENG Cong, LIANG Jiapeng, ZENG Jie, GAN Mingwei, ZHANG Hua, WEI Liangshuai. 2022. Identification of nitrate sources of groundwaters in the Zhaotong basin using hydrochemistry, nitrogen and oxygen isotopes and its impact on the environment[J]. Geology in China, 49(2): 409-419. doi: 10.12029/gc20220205
shu

Identification of nitrate sources of groundwaters in the Zhaotong basin using hydrochemistry, nitrogen and oxygen isotopes and its impact on the environment

  • 1.

    Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, Guangxi, China

  • 2.

    Key Laboratory of Karst Dynamics, Ministry of Natural Resources&Guangxi, Guilin 541004, Guangxi, China

  • 3.

    School of Environmental studies, China University of Geosciences, Wuhan 43007, Hubei, China

  • 4.

    Yunnan Institute of Geo-Environment Monitoring, Kunming 650216, Yunnan, China

  • 5.

    Institute of Exploration Technology, Chinese Academy of Geological Sciences, Chengdu 611734, Sichuan, China

    • Fund Project: Supported by the Guangxi Natural Science Foundation (No. 2021JJA150041), the National Natural Science Foundation of China (No.41702278), the project of China Geological Survey (No. DD20221758, No. DD20190326)
More Information
  • Author Bio: REN Kun, male, born in 1988, doctor candidate, research assistant, engaged in the research on groundwater environment and isotope geochemistry; E-mail: rkhblhk@163.com
  • Corresponding author: PAN Xiaodong, male, born in 1984, doctor candidate, professor engineer, engaged in the research on hydro-geology and engineering geology; E-mail: panxiaodong@karst.ac.cn 
Received Date:  03 February 2021
Revised Date:  28 March 2021
Publish Date:  25 April 2022
    Abstract

  • This paper is the result of the water resources and environmental geological survey engineering.

     Objective

    Nitrate contamination of groundwater is becoming more and more serious resulting from intensive human activities.

     Methods

    Hydrochemistry and stable nitrogen and oxygen isotopes were used to trace the nitrate sources and transformation groundwaters in the Zhaotong basin, China. As well as, the origin of nitrate in the spring and well waters was quantitatively analyzed by SIAR model.

     Results

    The results showed that: (1) The water quality of boreholes is good, while approximately 19% of the spring samples are not drinkable due to nitrate exceed the drinking water standard, and 13% of the well samples are unsuited to irrigation due to the high nitrate concentrations; (2) The ranges of δ15NNO3 in spring and well waters were 2.4‰-18‰ (mean of 7.9‰) and －4.5‰-39.7‰ (mean of 17.3‰), respectively, and the values of δ18ONO3 ranged from －8.8‰ to 39.3‰ (mean of 2.5‰), and from －16.4‰ to 26.7‰ (mean of 0‰), respectively. Based on the hydrochemical data and stable isotopic compositions, nitrification was the dominant process in the study area; (3) Nitrate in spring and well waters were mainly from manure & sewage, soil nitrogen, and ammonium nitrogen fertilizer. The SIAR model showed that the contributions of manure & sewage, soil nitrogen, and ammonium nitrogen fertilizer to spring were 48%, 28% and 24%, respectively, and to well water were 87%, 6% and 7%, respectively.

     Conclusions

    Manure & sewage end-member accounted for 89% and 72% in the groundwaters from residential and agricultural areas, respectively, while it only accounted for 27% in the groundwater from forestry land, indicating that the more strongly affected by human activities, the more serious nitrate contamination of groundwater.
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