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<p>Microbial respiration is conventionally considered the primary driver of short-term carbon dioxide pulses following soil drying-rewetting cycles. However, rapid emission kinetics and delayed microbial recovery in drought-impacted soils suggest substantial abiotic contributions to carbon mineralization, particularly in arid sandy soils. Here, we quantified abiotic carbon emissions during soil drying–rewetting through microbial growth monitoring and sterilization. In sandy soils, abiotic processes dominated initial emissions, accounting for 95.5% of total carbon dioxide production within three hours after rewetting, compared to 39.5% in paddy soils. Solid-liquid interfacial reactions during rewetting drove iron and manganese redox cycling, generating reactive oxygen species that directly promoted carbon mineralization. These reactive oxygen species synergized with enzymes to degrade organic carbon, preferentially targeting dissolved organic matter with low hydrogen-to-carbon ratios and high double bond equivalents, which are typically resistant to microbial degradation. Our findings show that abiotic processes dominate short-term carbon dynamics during rewetting of arid sandy soils.</p><p></p>

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Abiotic processes dominate short-term carbon emissions in sandy soils following rewetting

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月2日

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  • Fuhao Liu,
  • Kecheng Zhu,
  • Zhiqiang Wang,
  • Huiqiang Yang,
  • Zheng Ni,
  • Yuanyuan Ding,
  • Yalan Zheng,
  • Jiyan Weng,
  • Yanhua Wang,
  • Hanzhong Jia

摘要

Microbial respiration is conventionally considered the primary driver of short-term carbon dioxide pulses following soil drying-rewetting cycles. However, rapid emission kinetics and delayed microbial recovery in drought-impacted soils suggest substantial abiotic contributions to carbon mineralization, particularly in arid sandy soils. Here, we quantified abiotic carbon emissions during soil drying–rewetting through microbial growth monitoring and sterilization. In sandy soils, abiotic processes dominated initial emissions, accounting for 95.5% of total carbon dioxide production within three hours after rewetting, compared to 39.5% in paddy soils. Solid-liquid interfacial reactions during rewetting drove iron and manganese redox cycling, generating reactive oxygen species that directly promoted carbon mineralization. These reactive oxygen species synergized with enzymes to degrade organic carbon, preferentially targeting dissolved organic matter with low hydrogen-to-carbon ratios and high double bond equivalents, which are typically resistant to microbial degradation. Our findings show that abiotic processes dominate short-term carbon dynamics during rewetting of arid sandy soils.