The pH influence on ectomycorrhizal nitrogen acquisition and decomposition

Area of Science:

• Ecology
• Soil Science
• Mycology

Background:

• Ectomycorrhizal (EM) and saprotrophic fungi compete for soil nitrogen, influencing decomposition and carbon storage.
• The context-dependent effects of EM fungi on decomposition and nutrient cycling are poorly understood.
• Predicting EM fungal impacts on global biogeochemical cycles requires understanding their interactions with saprotrophs.

Purpose of the Study:

• To investigate global patterns of EM and saprotrophic fungal abundance.
• To determine the influence of fungal guilds on soil carbon and nutrient cycling.
• To identify key predictors of EM fungal dominance and their ecological effects.

Main Methods:

• Utilized a global dataset of soil fungal communities.
• Analyzed relationships between fungal abundance, soil stoichiometry, host tree functional group, and soil pH.
• Examined the influence of these factors on soil carbon and nitrogen cycling.

Main Results:

• EM fungal dominance and its effects on carbon (C) and nitrogen (N) cycling are globally predictable.
• Soil C:N stoichiometry, host tree functional group, and soil pH are key predictors.
• Soil pH influences N acquisition strategies of EM fungi, affecting decomposition rates.

Conclusions:

• Soil pH is a critical factor mediating EM-saprotroph interactions and their impact on decomposition.
• Predictable patterns of EM fungal influence on C and N cycling emerge from soil properties and host associations.
• This research provides a framework for predicting forest ecosystem responses to EM fungal dynamics.