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Deterioration of groundwater quality along an increasing intensive land use pattern in a small catchment

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  • Gao, Jingbo
  • Li, Zhiqin
  • Chen, Zhujun
  • Zhou, Yang
  • Liu, Weiguo
  • Wang, Lei
  • Zhou, Jianbin

Abstract

Land use change has greatly influenced groundwater quality worldwide. Identifying the effects of different intensive land uses on the groundwater quality is the first step in taking proper action to solve the problem. In this study, we compared the effects of different intensive land uses (region A, natural vegetation; region B, cereal fields; region C, kiwifruit orchards) in the Yujiahe catchment between 2015 and 2017 in Shaanxi, China, on the major ions and stable isotopes of nitrate (δ15N–NO3– and δ18O–NO3–). The NO3- groundwater concentrations increased from region A to region B and region C; NO3- concentrations in shallow groundwater were higher than those of deep groundwater in region C (55.3 vs. 28.9 mg/L, respectively). The NO3- concentrations in region A and region B did not exceed the WHO standard of 50 mg/L. However, 56.3% and 22.2% of the shallow and deep groundwater samples have NO3- concentrations exceeding the standard in region C, respectively. The average electrical conductivity (EC) values of springs in region A and shallow groundwater in regions B and C were 438, 525, and 753 µs/cm, respectively. Concentrations of Ca2+, Mg2+, Na+, Cl-, and HCO3- ions and nitrogen isotope values increased from region A to region C, indicating that intensive land use change has modified groundwater hydrochemical composition, and deteriorated groundwater quality. This study has highlighted the significant effect of intensive land use of orchards at the small catchment scale on the groundwater quality.

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  • Gao, Jingbo & Li, Zhiqin & Chen, Zhujun & Zhou, Yang & Liu, Weiguo & Wang, Lei & Zhou, Jianbin, 2021. "Deterioration of groundwater quality along an increasing intensive land use pattern in a small catchment," Agricultural Water Management, Elsevier, vol. 253(C).
  • Handle: RePEc:eee:agiwat:v:253:y:2021:i:c:s0378377421002183
    DOI: 10.1016/j.agwat.2021.106953
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    References listed on IDEAS

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    1. Xie, Zheyu & Zhang, Yujing & Zhang, Zhenyu & Huang, Jinliang, 2023. "Nitrate removal mechanism in riparian groundwater in an intensified agricultural catchment," Agricultural Water Management, Elsevier, vol. 280(C).
    2. Xuewen Liang & Yue Pan & Cunwu Li & Weixiong Wu & Xusheng Huang, 2023. "Evaluating the Influence of Land Use and Landscape Pattern on the Spatial Pattern of Water Quality in the Pearl River Basin," Sustainability, MDPI, vol. 15(20), pages 1-16, October.
    3. Muhammad Yousuf Jat Baloch & Wenjing Zhang & Baig Abdullah Al Shoumik & Anam Nigar & Adil A. M. Elhassan & Ali. E. A. Elshekh & Maaz Osman Bashir & Ahmed Fathi Mohamed Salih Ebrahim & Khalaf alla Adam, 2022. "Hydrogeochemical Mechanism Associated with Land Use Land Cover Indices Using Geospatial, Remote Sensing Techniques, and Health Risks Model," Sustainability, MDPI, vol. 14(24), pages 1-20, December.

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