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<p>Soil pH is a key attribute regulating biogeochemical processes, with its changes significantly influenced by land use patterns and acid deposition. While extensive research has focused on the causes of soil acidification, comprehensively understanding the mechanisms and extent of pH recovery in acidified soils is crucial for developing effective ecological management strategies. This study investigated the dynamic changes in soil pH recovery through 13&#xa0;years of field sampling across different land use patterns, including woodland, paddy, and upland. Results indicate that acidified soils under various land use patterns exhibit varying degrees of pH recovery trends, with an overall upward trend in pH values. Notably, forest soils exhibited the most pronounced recovery, with average pH rising from 3.70 to 4.81. This was followed by paddy and upland. The calculated reduction in free acidity confirmed this recovery sequence: woodland (-0.46&#xa0;mmol/kg) &gt; upland (-0.32&#xa0;mmol/kg) &gt; paddy (-0.225&#xa0;mmol/kg). The study identified key drivers of soil pH recovery, highlighting the decisive role of nitrogen and sulfur deposition alongside fertilizer application. Among these, reduced sulfur deposition emerged as the most influential factor, explaining the largest proportion of pH recovery across all land-use patterns. Furthermore, the study explored strategies to promote sustainable recovery of acidified soils in subtropical watersheds, emphasizing the importance of emission reductions. These findings provide valuable insights for regional applications and lay the groundwork for long-term ecosystem management, particularly in mitigating pollutant emissions and restoring soil health.</p>

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Nitrogen and Sulfur Deposition Contributes to Soil Acidity Variation Under Different Land use Patterns Over Decade in a Subtropical Small Watershed

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Hanchen Wu,
  • Xiaobin Guo,
  • Li Tang,
  • Yuting Dai,
  • Wenqian Jiang,
  • Haoyu Fu,
  • Pei Luo,
  • Jianlin Shen,
  • Jinshui Wu

摘要

Soil pH is a key attribute regulating biogeochemical processes, with its changes significantly influenced by land use patterns and acid deposition. While extensive research has focused on the causes of soil acidification, comprehensively understanding the mechanisms and extent of pH recovery in acidified soils is crucial for developing effective ecological management strategies. This study investigated the dynamic changes in soil pH recovery through 13 years of field sampling across different land use patterns, including woodland, paddy, and upland. Results indicate that acidified soils under various land use patterns exhibit varying degrees of pH recovery trends, with an overall upward trend in pH values. Notably, forest soils exhibited the most pronounced recovery, with average pH rising from 3.70 to 4.81. This was followed by paddy and upland. The calculated reduction in free acidity confirmed this recovery sequence: woodland (-0.46 mmol/kg) > upland (-0.32 mmol/kg) > paddy (-0.225 mmol/kg). The study identified key drivers of soil pH recovery, highlighting the decisive role of nitrogen and sulfur deposition alongside fertilizer application. Among these, reduced sulfur deposition emerged as the most influential factor, explaining the largest proportion of pH recovery across all land-use patterns. Furthermore, the study explored strategies to promote sustainable recovery of acidified soils in subtropical watersheds, emphasizing the importance of emission reductions. These findings provide valuable insights for regional applications and lay the groundwork for long-term ecosystem management, particularly in mitigating pollutant emissions and restoring soil health.