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<p>Brackish water irrigation holds significant potential in alleviating water scarcity. Investigating the mechanisms and implications of water and nitrogen regulation on soil nitrogen transformation under brackish water irrigation conditions is of great practical importance for advancing the efficient utilization of nitrogen under brackish water irrigation. In response to this, incubation experiments were performed on soil nitrogen transformation of water-filled pore space (40%, 70%, and 100%) and nitrogen application (0, 200, and 400&#xa0;mg/kg) under irrigation water salinity (0, 2.0, and 5.0&#xa0;g/L). We monitored soil inorganic nitrogen content, gas emissions, and the copy numbers of microbial functional genes involved in soil nitrogen transformation. The results showed that increased nitrogen application significantly promoted soil NH<sub>3</sub> volatilization, NO emission, and N<sub>2</sub>O emission. Higher irrigation water salinity decelerated the consumption rate of NO<sub>2</sub><sup>−</sup>-N and stimulated NO and N<sub>2</sub>O emissions. Elevated soil moisture content promoted denitrification and facilitated the conversion of NO to N<sub>2</sub>O, consequently enhancing N<sub>2</sub>O emissions. For soil NH<sub>3</sub> volatilization, increased irrigation water salinity exhibited a positive effect by slowing the consumption rate of NH<sub>4</sub><sup>+</sup>-N, whereas higher soil moisture content had a negative influence by accelerating the consumption rate of NH<sub>4</sub><sup>+</sup>-N. The variation in nitrogen application rate had a greater impact on soil gas emissions than that in soil moisture content and irrigation water salinity. Soil NH<sub>4</sub><sup>+</sup>-N was the key driver of the variations in soil gaseous nitrogen emissions in the present study.</p>

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Mechanisms and implications of water and nitrogen regulation on soil nitrogen transformation under brackish water irrigation

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Yu Wang,
  • Chenchen Wei,
  • Qiangqiang Li,
  • Peiling Yang,
  • Shumei Ren,
  • Lingyun Guo,
  • Ni Zhang

摘要

Brackish water irrigation holds significant potential in alleviating water scarcity. Investigating the mechanisms and implications of water and nitrogen regulation on soil nitrogen transformation under brackish water irrigation conditions is of great practical importance for advancing the efficient utilization of nitrogen under brackish water irrigation. In response to this, incubation experiments were performed on soil nitrogen transformation of water-filled pore space (40%, 70%, and 100%) and nitrogen application (0, 200, and 400 mg/kg) under irrigation water salinity (0, 2.0, and 5.0 g/L). We monitored soil inorganic nitrogen content, gas emissions, and the copy numbers of microbial functional genes involved in soil nitrogen transformation. The results showed that increased nitrogen application significantly promoted soil NH3 volatilization, NO emission, and N2O emission. Higher irrigation water salinity decelerated the consumption rate of NO2−-N and stimulated NO and N2O emissions. Elevated soil moisture content promoted denitrification and facilitated the conversion of NO to N2O, consequently enhancing N2O emissions. For soil NH3 volatilization, increased irrigation water salinity exhibited a positive effect by slowing the consumption rate of NH4+-N, whereas higher soil moisture content had a negative influence by accelerating the consumption rate of NH4+-N. The variation in nitrogen application rate had a greater impact on soil gas emissions than that in soil moisture content and irrigation water salinity. Soil NH4+-N was the key driver of the variations in soil gaseous nitrogen emissions in the present study.