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<p>Purpose: Intensive phosphate fertilization maintains crop yields in phosphorus (P) deficient agroecosystems, yet long-term sustainability productivity depends on balanced P cycling across soil layers. We investigated P contents and fractions in topsoil and subsoil of black soils (Mollisols) under consecutive maize straw return, to test whether straw inputs enhance soil P availability via enzyme-mediated organic P (P<sub>o</sub>) mineralization. Methods: A 6-year field microplot experiment was conducted in Harbin, Northeast China, with treatments of fertilizer alone, and fertilizer plus straw at 4.5, 9.0, and 13.5 t ha<sup>− 1</sup>. Topsoil and subsoil samples were analyzed for Hedley P fractions and carbon, nitrogen, and P acquisition enzyme activities to explore the relationships between straw return, enzyme responses, and soil P dynamics. Results: Straw return significantly increased available P in both layers by 184–255%, with the 9.0 t ha<sup>− 1</sup> straw input showing the greatest improvement. Enhanced alkaline phosphatase promoted P<sub>o</sub> mineralization in topsoil, whereas β-1, 4-glucosidase indirectly facilitated subsoil Po turnover through organic matter decomposition. Conclusions: Continuous maize straw return enhanced enzyme-mediated P transformation across soil layers, thereby increasing P availability and improving nutrient coupling. The findings provide mechanistic guidance for optimizing straw management to sustain fertility while reducing chemical fertilizer dependence.</p>

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Straw Return Enhances Enzyme-Mediated Phosphorus Transformation Across Soil Layers in Black Soil

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Jiahui Yuan,
  • Roland Bol,
  • Jiuming Zhang,
  • Enjun Kuang,
  • Yingxue Zhu,
  • Lei Sun,
  • Guanglei Chen,
  • Yu Wang,
  • Shenqiang Wang,
  • Jie Liu

摘要

Purpose: Intensive phosphate fertilization maintains crop yields in phosphorus (P) deficient agroecosystems, yet long-term sustainability productivity depends on balanced P cycling across soil layers. We investigated P contents and fractions in topsoil and subsoil of black soils (Mollisols) under consecutive maize straw return, to test whether straw inputs enhance soil P availability via enzyme-mediated organic P (Po) mineralization. Methods: A 6-year field microplot experiment was conducted in Harbin, Northeast China, with treatments of fertilizer alone, and fertilizer plus straw at 4.5, 9.0, and 13.5 t ha− 1. Topsoil and subsoil samples were analyzed for Hedley P fractions and carbon, nitrogen, and P acquisition enzyme activities to explore the relationships between straw return, enzyme responses, and soil P dynamics. Results: Straw return significantly increased available P in both layers by 184–255%, with the 9.0 t ha− 1 straw input showing the greatest improvement. Enhanced alkaline phosphatase promoted Po mineralization in topsoil, whereas β-1, 4-glucosidase indirectly facilitated subsoil Po turnover through organic matter decomposition. Conclusions: Continuous maize straw return enhanced enzyme-mediated P transformation across soil layers, thereby increasing P availability and improving nutrient coupling. The findings provide mechanistic guidance for optimizing straw management to sustain fertility while reducing chemical fertilizer dependence.