Microbial diversity, producer-decomposer interactions and ecosystem processes: a theoretical model

Area of Science:

• Ecology
• Ecosystem Dynamics
• Biogeochemical Cycles

Background:

• Ecosystems rely on primary producers (plants) and decomposers (microbes) for fundamental functioning.
• Interactions between producer and decomposer diversity significantly impact ecosystem processes, especially in simplified environments.

Purpose of the Study:

• To investigate the impact of plant and microbial diversity on ecosystem functioning using a simple ecosystem model.
• To identify key parameters controlling nutrient recycling efficiency and overall ecosystem productivity.

Main Methods:

• Developed a theoretical ecosystem model linking plants and microbes through material cycling.
• Incorporated diversity of plant organic compounds and microbial species.
• Analyzed nutrient recycling efficiency as a key determinant of ecosystem processes.

Main Results:

• Microbial diversity positively influences nutrient recycling efficiency and ecosystem processes.
• Plant organic compound diversity shows a negative or neutral effect on ecosystem processes in stable environments.
• Microbial niche breadth and overlap impact processes only if they increase the range of decomposed compounds.

Conclusions:

• Microbial diversity enhances ecosystem functioning through improved nutrient cycling and organic matter decomposition.
• Plant diversity may have antagonistic effects on ecosystem processes, contrasting with microbial effects.
• The opposing influences of plant and microbial diversity on ecosystem functioning may explain experimental observations.