Scholarlink

Aims <p>Soil microorganisms are essential for regulating ecosystem functions, but their diversity, community structure and functions are influenced by aridity. The interactions among soil microorganisms, multifunctionality (MF) and aridity remain poorly understood.</p> Methods <p>In this study, we investigated bacterial and fungal community structure, co-occurrence networks, and assembly processes in rhizosphere and bulk soils under <i>Caragana korshinskii</i> plantations along an aridity gradient in arid and semiarid regions.</p> Results <p>The results revealed that under different aridity gradients, deterministic and stochastic processes dominated the bacterial and fungal community assemblies, respectively. The bacterial community structure was more susceptible to the influence of soil properties than was the fungal community structure. With increasing aridity, the soil properties, MF, and microbial network complexity decreased significantly. The microbial keystone species, such as Alphaproteobacteria, Actinobacteria, Sordariomycetes, and Mortierellomycetes, had a great influence on mediating soil MF. This differential response between the rhizosphere and bulk soils decreased with increasing aridity. In addition, structural equation modeling suggested that aridity induced changes in soil moisture and pH and indirectly influenced soil MF by mediating fungal keystone taxa and bacterial network complexity and diversity, respectively.</p> Conclusion <p>These results emphasize the role of complex interactions among microbes on mediating soil MF under arid conditions. Moreover, soil MF could be enhanced by regulating soil moisture and pH, thus driving changes in microbial communities in a particular direction under arid conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Aridity simplified the bacterial network and thus reduced soil multifunctionality in arid and semiarid regions

  • 期刊论文

  • 发表日期：

    2025年6月26日

查看全文
  • Liguo Dong,
  • Xiaoxiong Bai,
  • Xuan Yu,
  • Guoyu Zhang,
  • Sile Hu,
  • Chengjie Ren,
  • Sheng Zhang

摘要

Aims

Soil microorganisms are essential for regulating ecosystem functions, but their diversity, community structure and functions are influenced by aridity. The interactions among soil microorganisms, multifunctionality (MF) and aridity remain poorly understood.

Methods

In this study, we investigated bacterial and fungal community structure, co-occurrence networks, and assembly processes in rhizosphere and bulk soils under Caragana korshinskii plantations along an aridity gradient in arid and semiarid regions.

Results

The results revealed that under different aridity gradients, deterministic and stochastic processes dominated the bacterial and fungal community assemblies, respectively. The bacterial community structure was more susceptible to the influence of soil properties than was the fungal community structure. With increasing aridity, the soil properties, MF, and microbial network complexity decreased significantly. The microbial keystone species, such as Alphaproteobacteria, Actinobacteria, Sordariomycetes, and Mortierellomycetes, had a great influence on mediating soil MF. This differential response between the rhizosphere and bulk soils decreased with increasing aridity. In addition, structural equation modeling suggested that aridity induced changes in soil moisture and pH and indirectly influenced soil MF by mediating fungal keystone taxa and bacterial network complexity and diversity, respectively.

Conclusion

These results emphasize the role of complex interactions among microbes on mediating soil MF under arid conditions. Moreover, soil MF could be enhanced by regulating soil moisture and pH, thus driving changes in microbial communities in a particular direction under arid conditions.