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<p>Organic fertilization and planting interactively regulate soil carbon (C) storage, phosphorus (P) components, and microbial respiration, providing insights for optimizing fertilization regimes in farmland. This study employed a pot experiment with organic fertilization and crop planting as two factors, each at two levels, was conducted to comparatively analyze the changes in soil organic C, P fractions (total organic P/total inorganic P, Po/Pi), and microbial respiration (SIR, substrate-induced respiration) under different treatments (organic fertilizer application, planting crops or not, and their combinations). The results showed that long-term absence of organic inputs significantly reduced soluble C by 33–56% and enhanced organic P mineralization (indicated by a 27% decrease in Po/Pi ratio). Organic fertilizer application increased soluble C by 18–22% in the topsoil (0–5&#xa0;cm), and this increase was greater than that observed in the absence of crops, stimulated microbial respiration (+ 30%), and led to a 3.6-fold accumulation of labile organic P. However, it exacerbated P availability stratification (40% decline in Po/Pi). Crop cultivation increased microbial biomass (+ 15–20%) and improved subsoil P speciation (50% increase in Po/Pi). Combining deep-rooted crop cultivation with surface organic fertilizer application synergistically enhances soil C sequestration.</p>

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Effects of organic amendments and crop cultivation on soil organic carbon storage, phosphorus components, and microbial respiration in stratified soils

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月26日

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  • Xue Li,
  • Joan Romanyà,
  • Qi Fu,
  • Xiumei Zhan,
  • Shiyu Zhang

摘要

Organic fertilization and planting interactively regulate soil carbon (C) storage, phosphorus (P) components, and microbial respiration, providing insights for optimizing fertilization regimes in farmland. This study employed a pot experiment with organic fertilization and crop planting as two factors, each at two levels, was conducted to comparatively analyze the changes in soil organic C, P fractions (total organic P/total inorganic P, Po/Pi), and microbial respiration (SIR, substrate-induced respiration) under different treatments (organic fertilizer application, planting crops or not, and their combinations). The results showed that long-term absence of organic inputs significantly reduced soluble C by 33–56% and enhanced organic P mineralization (indicated by a 27% decrease in Po/Pi ratio). Organic fertilizer application increased soluble C by 18–22% in the topsoil (0–5 cm), and this increase was greater than that observed in the absence of crops, stimulated microbial respiration (+ 30%), and led to a 3.6-fold accumulation of labile organic P. However, it exacerbated P availability stratification (40% decline in Po/Pi). Crop cultivation increased microbial biomass (+ 15–20%) and improved subsoil P speciation (50% increase in Po/Pi). Combining deep-rooted crop cultivation with surface organic fertilizer application synergistically enhances soil C sequestration.