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<p>The depletion of P resources is threatening agricultural sustainability and understanding the mechanisms by which land use change can restore soil health is therefore essential. This study investigated the long-term dynamics of soil phosphorus (P) following the conversion of cropland to grassland in northwestern Spain. The research evaluated how increases in soil organic matter (SOM) have influenced soil P forms along a 40-year chronosequence of grassland establishment, revealing a slow but gradual recovery of organic P (Po), mainly as P-monoesters and diesters. Intensive cropland management initially led to the significant loss of organic P through accelerated mineralization, promoting the dominance of inorganic P (Pi) forms. However, grassland establishment led to a gradual increase in the organic P contents, Po: Pi ratios and soil organic carbon (SOC): Po ratios, suggesting that conversion of cropland to grassland can partly mitigate the initial losses and promote P sustainability (improving nutritional P-use efficiency). Although the recovery of P levels and P distribution to the original state is a long-term prospect, the research findings highlight the important role of grassland conservation in sustaining soil nutrient cycles and fostering agroecosystem resilience.</p>

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Soil phosphorus dynamics during grassland establishment after deforestation and intensive agricultural use

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Pablo Souza-Alonso,
  • Verónica Piñeiro,
  • Agustín Merino

摘要

The depletion of P resources is threatening agricultural sustainability and understanding the mechanisms by which land use change can restore soil health is therefore essential. This study investigated the long-term dynamics of soil phosphorus (P) following the conversion of cropland to grassland in northwestern Spain. The research evaluated how increases in soil organic matter (SOM) have influenced soil P forms along a 40-year chronosequence of grassland establishment, revealing a slow but gradual recovery of organic P (Po), mainly as P-monoesters and diesters. Intensive cropland management initially led to the significant loss of organic P through accelerated mineralization, promoting the dominance of inorganic P (Pi) forms. However, grassland establishment led to a gradual increase in the organic P contents, Po: Pi ratios and soil organic carbon (SOC): Po ratios, suggesting that conversion of cropland to grassland can partly mitigate the initial losses and promote P sustainability (improving nutritional P-use efficiency). Although the recovery of P levels and P distribution to the original state is a long-term prospect, the research findings highlight the important role of grassland conservation in sustaining soil nutrient cycles and fostering agroecosystem resilience.