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Background and aims <p>Strip clearcutting and replanting (SCR) is an important method of improving stand structure and changing soil multifunctionality. However, the effects of this process on soil carbon accumulation and microbial carbon use efficiency (CUE) remain unclear.</p> Methods <p>We established 10 treatments in Chinese fir plantations (coniferous): <i>Schima superba</i> (evergreen broad-leaved) replanting in 10- (CS1), 20- (CS2), and 30-m (CS3) strips, <i>Liquidambar formosana</i> (deciduous broad-leaved) replanting in 10- (CL1), 20- (CL2), and 30-m (CL3) strips, three remaining strips (C1, C2, and C3), and un-thinned control. We systematically analyzed the effects of SCR on CUE and assessed the mechanisms underlying soil microbial necromass carbon (NC) and organic carbon (SOC) accumulation.</p> Results <p>The results showed that only CL3 significantly increased SOC, fungal NC, bacterial NC, and microbial NC (by 80.1%, 75.1%, 74.5%, and 75.0%, respectively). C2 significantly reduced the fungal NC:SOC, bacterial NC:SOC, and microbial NC:SOC, whereas C1 markedly decreased the CUE. Among the SCR treatments, CL1 exhibited the highest fungal NC:SOC, microbial NC:SOC, and CUE. Most SCR treatments (except CS1, CL2, and CL3) demonstrated an overall increase in the fungal NC:bacterial NC ratio, which was &gt; 1 in all treatments. Total nitrogen, total phosphorus, microbial biomass, and microbial NC were key factors influencing SOC, whereas microbial biomass carbon and microbial carbon limitation were predictors of CUE. SOC was significantly positively correlated with microbial NC:SOC but not with CUE.</p> Conclusions <p>Replanting <i>L. formosana</i> promotes SOC and CUE. Notably, replanting <i>L. formosana</i> in strips with a 30&#xa0;m width had the best promoting effect on soil carbon accumulation.</p>

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Strip clearcutting and replanting effects on soil organic carbon, microbial necromass carbon, and microbial carbon use efficiency in Chinese fir plantations

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Xinran Zhao,
  • Huiling Zhou,
  • Hongwei Xu,
  • Lin Xu,
  • Chengming You,
  • Li Zhang,
  • Bo Tan,
  • Zhenfeng Xu,
  • Han Li,
  • Lixia Wang,
  • Sining Liu,
  • Xinglei Cui,
  • Minggang Wang

摘要

Background and aims

Strip clearcutting and replanting (SCR) is an important method of improving stand structure and changing soil multifunctionality. However, the effects of this process on soil carbon accumulation and microbial carbon use efficiency (CUE) remain unclear.

Methods

We established 10 treatments in Chinese fir plantations (coniferous): Schima superba (evergreen broad-leaved) replanting in 10- (CS1), 20- (CS2), and 30-m (CS3) strips, Liquidambar formosana (deciduous broad-leaved) replanting in 10- (CL1), 20- (CL2), and 30-m (CL3) strips, three remaining strips (C1, C2, and C3), and un-thinned control. We systematically analyzed the effects of SCR on CUE and assessed the mechanisms underlying soil microbial necromass carbon (NC) and organic carbon (SOC) accumulation.

Results

The results showed that only CL3 significantly increased SOC, fungal NC, bacterial NC, and microbial NC (by 80.1%, 75.1%, 74.5%, and 75.0%, respectively). C2 significantly reduced the fungal NC:SOC, bacterial NC:SOC, and microbial NC:SOC, whereas C1 markedly decreased the CUE. Among the SCR treatments, CL1 exhibited the highest fungal NC:SOC, microbial NC:SOC, and CUE. Most SCR treatments (except CS1, CL2, and CL3) demonstrated an overall increase in the fungal NC:bacterial NC ratio, which was > 1 in all treatments. Total nitrogen, total phosphorus, microbial biomass, and microbial NC were key factors influencing SOC, whereas microbial biomass carbon and microbial carbon limitation were predictors of CUE. SOC was significantly positively correlated with microbial NC:SOC but not with CUE.

Conclusions

Replanting L. formosana promotes SOC and CUE. Notably, replanting L. formosana in strips with a 30 m width had the best promoting effect on soil carbon accumulation.