Soil microbes develop plastic nutrient acquisition strategies under changing plant litter inputs

Area of Science:

• Soil ecology
• Microbial ecology
• Biogeochemistry

Background:

• Resource allocation theory guides microbial nutrient acquisition, but strategies under changing litter conditions are unclear.
• Global shifts in plant litter due to disturbances necessitate understanding microbial responses for nutrient cycling.
• Soil microbes are crucial for nutrient cycling, relying on litter as a primary nutrient source.

Purpose of the Study:

• To assess how litter addition and removal impact microbial nutrient acquisition strategies.
• To investigate the temporal dynamics of nitrogen (N) and phosphorus (P) enzyme activities in response to litter changes.
• To provide insights into microbial resource allocation theory and soil nutrient availability.

Main Methods:

• Synthesized data from global litter manipulation experiments.
• Analyzed soil enzyme activities related to nitrogen (N) and phosphorus (P) acquisition.
• Examined the temporal dynamics of enzyme activities under litter addition and removal.

Main Results:

• Litter addition initially stimulates N- and P-acquiring enzyme activities, prioritizing the most limiting nutrient, but this effect diminishes over time.
• Litter removal initially suppresses enzyme activities and favors P acquisition, later shifting towards N acquisition and microbial growth.
• Microbial responses demonstrate plasticity, adapting enzyme production based on nutrient availability and disturbance type.

Conclusions:

• Microbial nutrient acquisition strategies are highly plastic and responsive to changes in litter input.
• Findings refine resource allocation theory by detailing microbial responses to varying resource conditions.
• Understanding these microbial dynamics is key to predicting soil nutrient availability under global environmental change.