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Aims <p>Mulching is a common practice in agricultural systems that affects the soil structure and soil organic carbon (SOC) content; however, these effects have not been comprehensively evaluated. Therefore, we aimed to evaluate the effects of mulching under different agricultural environments on soil aggregate stability and C accumulation. Our results provide guidance for optimizing mulching and agricultural management practices.</p> Methods <p>We conducted a meta-analysis of 1080 observations from 87 publications to investigate mulching effects on soil aggregates and SOC, and to clarify the regulatory role of associated key factors.</p> Results <p>Overall, we found that mulching promotes soil aggregate formation and carbon(C) accumulation. Based on subgroup analysis, mulching during the growth period has the greatest impact. The application of chemical fertilizer (&lt; 100&#xa0;kg&#xa0;ha<sup>−1</sup>) increases aggregate formation and C accumulation. The effects of short-term mulching (&lt; 5&#xa0;years) are more pronounced than those of long-term mulching. Full film mulching improves aggregate stability, while straw mulching affects aggregate formation, with the greatest effect at an application rate of 5–10 t ha<sup>−1</sup>. Both large macroaggregates and small macroaggregates C increase linearly with an increase in&#xa0;either precipitation or temperature. Soil pH affects soil aggregate formation through microbial action, whereas soil total nitrogen (TN) affects C accumulation by affecting microbial activity.</p> Conclusions <p>These results provide insights into how mulching affects soil aggregates and aggregate SOC, highlighting the importance of implementing reasonable agronomic management measures to stabilize the soil structure and promote C accumulation under mulching.</p>

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A meta-analysis of impacts of mulching under different agricultural environments on soil aggregates and organic carbon

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Feiyang He,
  • Hongtao Zhang,
  • Daoyin Shi,
  • Guorui Li,
  • Yueshan Song,
  • Yaru Pang,
  • Yuqing Meng,
  • Pengfei Shen,
  • Xiaoxia Wen

摘要

Aims

Mulching is a common practice in agricultural systems that affects the soil structure and soil organic carbon (SOC) content; however, these effects have not been comprehensively evaluated. Therefore, we aimed to evaluate the effects of mulching under different agricultural environments on soil aggregate stability and C accumulation. Our results provide guidance for optimizing mulching and agricultural management practices.

Methods

We conducted a meta-analysis of 1080 observations from 87 publications to investigate mulching effects on soil aggregates and SOC, and to clarify the regulatory role of associated key factors.

Results

Overall, we found that mulching promotes soil aggregate formation and carbon(C) accumulation. Based on subgroup analysis, mulching during the growth period has the greatest impact. The application of chemical fertilizer (< 100 kg ha−1) increases aggregate formation and C accumulation. The effects of short-term mulching (< 5 years) are more pronounced than those of long-term mulching. Full film mulching improves aggregate stability, while straw mulching affects aggregate formation, with the greatest effect at an application rate of 5–10 t ha−1. Both large macroaggregates and small macroaggregates C increase linearly with an increase in either precipitation or temperature. Soil pH affects soil aggregate formation through microbial action, whereas soil total nitrogen (TN) affects C accumulation by affecting microbial activity.

Conclusions

These results provide insights into how mulching affects soil aggregates and aggregate SOC, highlighting the importance of implementing reasonable agronomic management measures to stabilize the soil structure and promote C accumulation under mulching.