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Aims <p>Variations in root diameter significantly affected nutrient cycling. Therefore, it is crucial to understand their influences on the root decomposition rate across the globe.</p> Methods <p>A dataset containing 80 published articles and 425 observations was compiled to examine the influencing factors and effects of increasing root diameter on decomposition rate.</p> Results <p>Root decomposition rate increased by 13.2% with increasing root diameter in roots ≤ 1&#xa0;mm in diameter, but the roots between 2–5&#xa0;mm and &gt; 5&#xa0;mm decreased decomposition by 15.7% and 23.3% compared to the ≤ 1&#xa0;mm roots, respectively. However, changes in root diameter did not markedly influence the decomposition rate in the 1–2&#xa0;mm roots relative to the ≤ 1&#xa0;mm roots. The effects of increasing root diameter on decomposition rate were related to the aridity index, with an increase and a decrease at low and high aridity index values, respectively. Root decomposition rate markedly increased when the root C:N ratio was &lt; 50, but decreased when the C:N ratio was 50–100 and ≥ 100. In addition, root decomposition rate increased when the root lignin:N ratio was &lt; 25 and 25–50, but decreased when the ratio was ≥ 50. The structural equation model (SEM) showed that the change in decomposition rate was directly related to the changes in root C:N.</p> Conclusions <p>The findings suggested that the impact of increasing root diameter on the decomposition rate was mainly controlled by the root diameter range and that it induced changes in root litter quality.</p>

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Different effects of increasing root diameter on the root litter decomposition rate in forests across the globe

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Lijun Fan,
  • Weiwei Wang,
  • Bin Zhang,
  • Qiang Xiao,
  • Xuejun Liu,
  • Yuan Su

摘要

Aims

Variations in root diameter significantly affected nutrient cycling. Therefore, it is crucial to understand their influences on the root decomposition rate across the globe.

Methods

A dataset containing 80 published articles and 425 observations was compiled to examine the influencing factors and effects of increasing root diameter on decomposition rate.

Results

Root decomposition rate increased by 13.2% with increasing root diameter in roots ≤ 1 mm in diameter, but the roots between 2–5 mm and > 5 mm decreased decomposition by 15.7% and 23.3% compared to the ≤ 1 mm roots, respectively. However, changes in root diameter did not markedly influence the decomposition rate in the 1–2 mm roots relative to the ≤ 1 mm roots. The effects of increasing root diameter on decomposition rate were related to the aridity index, with an increase and a decrease at low and high aridity index values, respectively. Root decomposition rate markedly increased when the root C:N ratio was < 50, but decreased when the C:N ratio was 50–100 and ≥ 100. In addition, root decomposition rate increased when the root lignin:N ratio was < 25 and 25–50, but decreased when the ratio was ≥ 50. The structural equation model (SEM) showed that the change in decomposition rate was directly related to the changes in root C:N.

Conclusions

The findings suggested that the impact of increasing root diameter on the decomposition rate was mainly controlled by the root diameter range and that it induced changes in root litter quality.