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<p>To investigate changes in water quality in the Inner Mongolia of Yellow River Basin (IM-YRB) and to elucidate the relationship between climate and water quality, this study employed the Water Quality Index (WQI) method, based on six water quality parameters, to conduct a comprehensive assessment of water quality from 2010 to 2020. The results showed that: 1) Temperature, precipitation and runoff in the IM-YRB showed an increasing trend from 2010 to 2020. Significant negative relationship was detected between temperature and chemical oxygen demand (COD), runoff and NH<sub>3</sub>-N. Runoff exhibited a strong positive correlation with fluoride (F<sup>−</sup>) (<i>p</i> &lt; 0.05). 2) The variation of water quality parameters exhibited a decreased trend from 2010 to 2020. The highest concentration of Permanganate index (COD<sub>Mn</sub>) and NH<sub>3</sub>-N respectively was 3.47 and 0.33&#xa0;mg/L in 2011. The concentration of COD (14.89&#xa0;mg/L) and Five-day biochemical oxygen demand (BOD<sub>5</sub>) (3.21&#xa0;mg/L) exhibited a decreasing trend since 2013. TP showed a decreasing trend since 2012, with a minimum of 0.06&#xa0;mg/L in 2018. The mean concentration of F<sup>−</sup> was 0.44&#xa0;mg/L with a decreasing trend from 2011 and a minimum of 0.32&#xa0;mg/L in 2019. WQI was significantly improved since 2015. The linear mixed-effects model indicates that NH<sub>3</sub>-N, COD<sub>Mn</sub>, and total phosphorus (TP) were the primary parameters influencing the WQI from 2010 to 2015. NH<sub>3</sub>-N, COD<sub>Mn</sub>, and COD were the primary parameters influencing the WQI from 2015 to 2020. 3) Significant spatial differences in water quality parameters (<i>p</i> &lt; 0.05). The water quality of the Meidaigou river, Wulanmulin river, and Hun river station remained good state. Kundulun river, Xi river, Xiaohei river and Dong river remained poor state.This study provides a basis for understanding changes in water quality in the Inner Mongolia region of the Yellow River Basin and offers guidance for water pollution prevention and control efforts in the basin.</p>

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Study on Climate Change and Water Quality Response in Yellow River Basin of Inner Mongolia

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月27日

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  • Lei Shi,
  • Hongyu Liu

摘要

To investigate changes in water quality in the Inner Mongolia of Yellow River Basin (IM-YRB) and to elucidate the relationship between climate and water quality, this study employed the Water Quality Index (WQI) method, based on six water quality parameters, to conduct a comprehensive assessment of water quality from 2010 to 2020. The results showed that: 1) Temperature, precipitation and runoff in the IM-YRB showed an increasing trend from 2010 to 2020. Significant negative relationship was detected between temperature and chemical oxygen demand (COD), runoff and NH3-N. Runoff exhibited a strong positive correlation with fluoride (F−) (p < 0.05). 2) The variation of water quality parameters exhibited a decreased trend from 2010 to 2020. The highest concentration of Permanganate index (CODMn) and NH3-N respectively was 3.47 and 0.33 mg/L in 2011. The concentration of COD (14.89 mg/L) and Five-day biochemical oxygen demand (BOD5) (3.21 mg/L) exhibited a decreasing trend since 2013. TP showed a decreasing trend since 2012, with a minimum of 0.06 mg/L in 2018. The mean concentration of F− was 0.44 mg/L with a decreasing trend from 2011 and a minimum of 0.32 mg/L in 2019. WQI was significantly improved since 2015. The linear mixed-effects model indicates that NH3-N, CODMn, and total phosphorus (TP) were the primary parameters influencing the WQI from 2010 to 2015. NH3-N, CODMn, and COD were the primary parameters influencing the WQI from 2015 to 2020. 3) Significant spatial differences in water quality parameters (p < 0.05). The water quality of the Meidaigou river, Wulanmulin river, and Hun river station remained good state. Kundulun river, Xi river, Xiaohei river and Dong river remained poor state.This study provides a basis for understanding changes in water quality in the Inner Mongolia region of the Yellow River Basin and offers guidance for water pollution prevention and control efforts in the basin.