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<p>Understanding of plant- and microbial-derived soil organic carbon (SOC) accumulation is crucial for improving and predicting soil carbon sequestration. However, mechanisms through which thinning regulates depth-related pattern of plant- and microbial-driven SOC accumulation remain partially understood. Plant residues and soil samples were collected from thinned forests (TH forests) and unthinned forests (NT forests) in secondary forests of Northeast China. Lignin phenol and amino sugar concentrations were determined to obtain plant- and microbial-derived SOC, respectively. We assessed impact factors (i.e., soluble vs. structural plant residues control, soil characteristics influence, canopy structure linkage) regulating plant- and microbial-derived SOC accrual along soil profiles. Allocation patterns of microbial- and plant-derived SOC were substantially influenced by thinning-related plant residues input and canopy structure. In TH forests, abundant but low-structural plant residues input, coupled with enhanced undercanopy photosynthetic photon flux density boosted topsoil plant- (19.51 ± 3.27&#xa0;g kg<sup>− 1</sup>) and microbial-derived SOC (24.2 ± 1.36&#xa0;g kg<sup>− 1</sup>) accrual, surpassing NT forests by 45.47% and 19.30%, respectively. Conversely, subsoil microbial-derived SOC accumulation was inhibited by 36.43% compared with NT forests attributed to reduced nutrient bioavailability and soil moisture. Thinning linked variation of plant residues input and canopy structure played a pivotal role in shaping accumulation patterns of plant- and microbial-derived carbon in secondary forest soil. These findings highlight tradeoff effects on soil carbon sequestration, providing distinct insight on mechanisms controlling soil carbon dynamics driven by plant residues and microbial necromass.</p>

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Thinning induced distinct depth-related pattern of plant- and microbial-derived soil organic carbon accumulation of secondary forests in Northeastern China

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Wenjun Wei,
  • Lili Yun,
  • Yixin Mao,
  • Huidong Zhang,
  • Da Yi,
  • Lili Dong

摘要

Understanding of plant- and microbial-derived soil organic carbon (SOC) accumulation is crucial for improving and predicting soil carbon sequestration. However, mechanisms through which thinning regulates depth-related pattern of plant- and microbial-driven SOC accumulation remain partially understood. Plant residues and soil samples were collected from thinned forests (TH forests) and unthinned forests (NT forests) in secondary forests of Northeast China. Lignin phenol and amino sugar concentrations were determined to obtain plant- and microbial-derived SOC, respectively. We assessed impact factors (i.e., soluble vs. structural plant residues control, soil characteristics influence, canopy structure linkage) regulating plant- and microbial-derived SOC accrual along soil profiles. Allocation patterns of microbial- and plant-derived SOC were substantially influenced by thinning-related plant residues input and canopy structure. In TH forests, abundant but low-structural plant residues input, coupled with enhanced undercanopy photosynthetic photon flux density boosted topsoil plant- (19.51 ± 3.27 g kg− 1) and microbial-derived SOC (24.2 ± 1.36 g kg− 1) accrual, surpassing NT forests by 45.47% and 19.30%, respectively. Conversely, subsoil microbial-derived SOC accumulation was inhibited by 36.43% compared with NT forests attributed to reduced nutrient bioavailability and soil moisture. Thinning linked variation of plant residues input and canopy structure played a pivotal role in shaping accumulation patterns of plant- and microbial-derived carbon in secondary forest soil. These findings highlight tradeoff effects on soil carbon sequestration, providing distinct insight on mechanisms controlling soil carbon dynamics driven by plant residues and microbial necromass.