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<p>Effects of phosphorus (P) fertilizer addition on nitrate production, consumption and N<sub>2</sub>O emissions in temperate cropland soils under low moisture conditions.&#xa0;<sup>15</sup>N labelling approach was used to distinguish N<sub>2</sub>O emissions from nitrification and denitrification in plant-free soils with and without P fertilizer under low moisture conditions, i.e. 45% and 60% water holding capacity (WHC).&#xa0;P addition significantly reduced NO<sub>3</sub>⁻ production (<i>p</i> = 0.01) but did not affect NO<sub>3</sub><sup>–</sup>consumption. N<sub>2</sub>O emissions marginally increased with P addition (<i>p</i> = 0.08). Isotopic analysis revealed that labelled NO<sub>3</sub><sup>–</sup> was the primary source of N<sub>2</sub>O, indicating that denitrification is responsible for N<sub>2</sub>O emissions even under these low moisture conditions.&#xa0;Despite inhibiting nitrification, P fertilizer addition stimulated denitrification, increasing N<sub>2</sub>O emissions, emphasizing the complex interaction of P and soil water in regulating N transformations. Understanding these interactions is crucial for developing adaptive P management strategies in aerobic soils to mitigate N<sub>2</sub>O emissions.</p>

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Phosphorus Addition Decreases Nitrate Production and Enhances Nitrous Oxide Emissions via Denitrification in a Temperate Agricultural Soil at Low Water Contents

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Anthony Imoudu Oyeogbe,
  • Anne Jansen-Willems,
  • Nicole Wrage-Mönnig

摘要

Effects of phosphorus (P) fertilizer addition on nitrate production, consumption and N2O emissions in temperate cropland soils under low moisture conditions. 15N labelling approach was used to distinguish N2O emissions from nitrification and denitrification in plant-free soils with and without P fertilizer under low moisture conditions, i.e. 45% and 60% water holding capacity (WHC). P addition significantly reduced NO3⁻ production (p = 0.01) but did not affect NO3–consumption. N2O emissions marginally increased with P addition (p = 0.08). Isotopic analysis revealed that labelled NO3– was the primary source of N2O, indicating that denitrification is responsible for N2O emissions even under these low moisture conditions. Despite inhibiting nitrification, P fertilizer addition stimulated denitrification, increasing N2O emissions, emphasizing the complex interaction of P and soil water in regulating N transformations. Understanding these interactions is crucial for developing adaptive P management strategies in aerobic soils to mitigate N2O emissions.