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<p>The increasing prevalence of abandoned secondary forests, resulting from human land use and forest management, often cause the dominance of specific plant species. In the Rokko mountain range (Hyogo Prefecture, Japan), <i>Pieris japonica</i> and dwarf bamboo form a dense understory, hindering the establishment of other plant species. This study investigated how diverse tree compositions and the selective removal of dominant understory plants affect soil environmental conditions (litter and humus contents and soil nutrient levels) as well as fungal community dynamics in these forests. Plots dominated by trees associated with ericoid mycorrhizal (ErM), arbuscular mycorrhizal (AM), and both ectomycorrhizal (ECM) and AM (ECM−AM) fungi had higher proportions of corresponding mycorrhizal fungi. <i>Pieris</i> removal led to enhanced humus accumulation and organic matter content and a shift toward pathotroph−symbiotic fungal dominance. Conversely, dwarf bamboo removal resulted in a minor increase in soil pH and a shift toward pathotrophic fungal communities. The effects of <i>Pieris</i> removal were also observed in plots following removal of both species. Understory management significantly alters soil biogeochemistry and fungal community composition and function. This study underscores the importance of maintaining tree diversity and implementing appropriate understory management strategies to conserve local fungal communities and landscape elements in secondary forests.</p>

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Variations in soil compositions and fungal communities are linked to tree composition and understory management

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Yuji Tokumoto,
  • Souta Okuyama,
  • Koki Sueyoshi,
  • Harunobu Tanigawa,
  • Rui Ren,
  • Wakana A. Azuma

摘要

The increasing prevalence of abandoned secondary forests, resulting from human land use and forest management, often cause the dominance of specific plant species. In the Rokko mountain range (Hyogo Prefecture, Japan), Pieris japonica and dwarf bamboo form a dense understory, hindering the establishment of other plant species. This study investigated how diverse tree compositions and the selective removal of dominant understory plants affect soil environmental conditions (litter and humus contents and soil nutrient levels) as well as fungal community dynamics in these forests. Plots dominated by trees associated with ericoid mycorrhizal (ErM), arbuscular mycorrhizal (AM), and both ectomycorrhizal (ECM) and AM (ECM−AM) fungi had higher proportions of corresponding mycorrhizal fungi. Pieris removal led to enhanced humus accumulation and organic matter content and a shift toward pathotroph−symbiotic fungal dominance. Conversely, dwarf bamboo removal resulted in a minor increase in soil pH and a shift toward pathotrophic fungal communities. The effects of Pieris removal were also observed in plots following removal of both species. Understory management significantly alters soil biogeochemistry and fungal community composition and function. This study underscores the importance of maintaining tree diversity and implementing appropriate understory management strategies to conserve local fungal communities and landscape elements in secondary forests.