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<p>Currently, there is limited research on the interconnections between the effects of thinning and pruning on soil quality in fast-growing plantations, limiting our understanding of their rational application. To address this, we designed an experiment at the Southern National Forest Seedling Demonstration Base. The experiment implemented a two-factor plan involving thinning intensities and pruning methods, with four levels of thinning intensities (0%, 36%, 52%, and 68%) and two levels of pruning methods (pruning and no pruning). There were therefore a total of eight treatments. Changes in soil factors were studied in three different soil layers (0–20&#xa0;cm, 20–40&#xa0;cm, and 40–60&#xa0;cm) over five years to assess abiotic properties and microbial community dynamics. Thinning promotes root-mediated processes that enhance tree growth, but also exacerbates soil acidification and nutrient depletion, leading to a filtered microbial community with reduced diversity. Pruning enhances nutrient cycling driven by litter through the addition of branch residues, which improves soil chemical properties and fosters a more diverse yet less stable microbial assemblage. T<sub>36</sub> (36% thinning without pruning) exhibited the most stable microbial co-occurrence network, suggesting that moderate thinning maintains a long-term balance in soil ecological sustainability. These results provide a scientific basis for optimizing thinning and pruning practices to balance stand productivity and long-term sustainability.</p>

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Soil quality analysis of fast-growing plantation after thinning and pruning: a case study of Eucalyptus urograndis

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Shitao Zhang,
  • Linnan Ouyang,
  • Shaoxiong Chen,
  • Jiaqi Yang,
  • Chunxu Li

摘要

Currently, there is limited research on the interconnections between the effects of thinning and pruning on soil quality in fast-growing plantations, limiting our understanding of their rational application. To address this, we designed an experiment at the Southern National Forest Seedling Demonstration Base. The experiment implemented a two-factor plan involving thinning intensities and pruning methods, with four levels of thinning intensities (0%, 36%, 52%, and 68%) and two levels of pruning methods (pruning and no pruning). There were therefore a total of eight treatments. Changes in soil factors were studied in three different soil layers (0–20 cm, 20–40 cm, and 40–60 cm) over five years to assess abiotic properties and microbial community dynamics. Thinning promotes root-mediated processes that enhance tree growth, but also exacerbates soil acidification and nutrient depletion, leading to a filtered microbial community with reduced diversity. Pruning enhances nutrient cycling driven by litter through the addition of branch residues, which improves soil chemical properties and fosters a more diverse yet less stable microbial assemblage. T36 (36% thinning without pruning) exhibited the most stable microbial co-occurrence network, suggesting that moderate thinning maintains a long-term balance in soil ecological sustainability. These results provide a scientific basis for optimizing thinning and pruning practices to balance stand productivity and long-term sustainability.