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<p>Understanding how harvest residue management impacts soil organic carbon (SOC) accumulation is crucial for accurately assessing SOC sequestration potential in plantation ecosystems. However, the effect of different harvest residue management practices on the distribution of plant- and microbial-derived carbon within soil fractions (POM: particulate organic matter; MAOM: mineral-associated organic matter) remains unclear. A randomized block experiment was established in a subtropical Chinese fir (<i>Cunninghamia lanceolata</i> (Lamb.) Hook) plantation to compare two harvest residue management practices: residue retention and removal. Lignin phenols and amino sugars were employed as biomarkers for plant- and microbial-derived carbon, respectively. The results showed that, compared to residue removal, residue retention increased SOC by 15.9% (<i>p</i> &lt; 0.05) and amino sugars by 24.9% (<i>p</i> &lt; 0.05) in bulk soil. Microbial necromass carbon accounted for approximately 86% of the total SOC increase following residue retention, indicating that microbial-derived carbon was the primary driver of SOC accumulation. In the POM fraction, harvest residue retention significantly increased amino sugars by 53.5% relative to harvest residue removal, while no significant change was observed in lignin phenol content. In contrast, harvest residue management had no significant effect on either plant- or microbial-derived carbon within the MAOM fraction. These findings suggest that harvest residue retention enhances SOC accumulation primarily by promoting microbial-derived carbon in the POM fraction. Therefore, the harvest residue retention is an effective management strategy for increasing SOC storage in subtropical plantation forests.</p>

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Responses of plant-and microbial-derived soil carbon to harvest residue retention in a subtropical Chinese fir plantation

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Jiamin Yang,
  • Xin Guan,
  • Weidong Zhang,
  • Renshan Li,
  • Lixiang Liu,
  • Shicong Geng,
  • Longchi Chen,
  • Silong Wang,
  • Qingpeng Yang

摘要

Understanding how harvest residue management impacts soil organic carbon (SOC) accumulation is crucial for accurately assessing SOC sequestration potential in plantation ecosystems. However, the effect of different harvest residue management practices on the distribution of plant- and microbial-derived carbon within soil fractions (POM: particulate organic matter; MAOM: mineral-associated organic matter) remains unclear. A randomized block experiment was established in a subtropical Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) plantation to compare two harvest residue management practices: residue retention and removal. Lignin phenols and amino sugars were employed as biomarkers for plant- and microbial-derived carbon, respectively. The results showed that, compared to residue removal, residue retention increased SOC by 15.9% (p < 0.05) and amino sugars by 24.9% (p < 0.05) in bulk soil. Microbial necromass carbon accounted for approximately 86% of the total SOC increase following residue retention, indicating that microbial-derived carbon was the primary driver of SOC accumulation. In the POM fraction, harvest residue retention significantly increased amino sugars by 53.5% relative to harvest residue removal, while no significant change was observed in lignin phenol content. In contrast, harvest residue management had no significant effect on either plant- or microbial-derived carbon within the MAOM fraction. These findings suggest that harvest residue retention enhances SOC accumulation primarily by promoting microbial-derived carbon in the POM fraction. Therefore, the harvest residue retention is an effective management strategy for increasing SOC storage in subtropical plantation forests.