Resource Type and Availability Regulate Fungal Communities Along Arable Soil Profiles

Area of Science:

• Soil microbiology
• Ecology
• Biogeochemistry

Background:

• Soil fungi are crucial for decomposing plant organic matter.
• Organic compound quality and quantity vary with season and soil depth.
• Understanding fungal community responses to resource availability is key for soil health.

Purpose of the Study:

• To investigate how plant resources (maize, wheat, litter) affect soil fungal communities.
• To analyze fungal community structure and biomass across soil depths and seasons.
• To determine the ecological niches and roles of fungi in the plant-soil system.

Main Methods:

• Field experiment with maize and wheat plots, including manipulated litter input.
• Fungal biomass quantified using ergosterol.
• Community structure analyzed via fungal automated ribosomal intergenic spacer analysis (F-ARISA).
• Sampling across a soil depth gradient (plough layer, rooted, root-free soil).

Main Results:

• Fungal communities were dynamic, varying significantly with soil depth and plant resources.
• Litter availability dominated fungal communities in the plough layer.
• Plant species (maize vs. wheat) influenced fungal communities in deeper, rooted, and root-free soil layers.
• Litter affected deeper soil communities in winter, suggesting vertical transport.

Conclusions:

• Soil depth and plant-derived resources create distinct ecological niches for fungal communities.
• Fungi play a central role in connecting primary production and decomposition in arable soils.
• Fungal communities exhibit dynamic responses to both living plants and litter inputs.