A bottom-up perspective on how fire changes ecosystem biogeochemistry via plant-soil interactions

Area of Science:

• Ecology
• Soil Science
• Biogeochemistry

Background:

• Fire's impact on ecosystems is complex and often studied in isolation.
• Plant-soil interactions are crucial for ecosystem response to fire but mechanisms remain debated.
• Existing research often describes patterns rather than underlying mechanisms of soil effects.

Purpose of the Study:

• To propose a bottom-up framework for understanding fire's effects on soil biogeochemistry.
• To highlight the critical role of plant-soil interactions in mediating fire impacts.
• To synthesize literature on fire effects on soil processes.

Main Methods:

• Mini-review compiling existing literature on fire effects on soil processes.
• Focus on plant-soil interactions as a central theme.
• Integration of findings with papers from a Special Issue on fire and plant-soil interactions.

Main Results:

• Fire's effects on soil biogeochemistry are influenced by soil carbon dynamics, nutrient acquisition strategies (including plant-microbial symbioses), and physical soil changes.
• These factors create biogeochemical feedbacks that modify ecosystem responses to fire.
• Specific processes include soil carbon saturation, mineral stabilization, nutrient uptake, and physical constraints on turnover.

Conclusions:

• Shifts in plant biomass and inputs consistently affect soil properties post-fire.
• Plant-soil interactions play a critical role in determining belowground processes affected by fire.
• A framework emphasizing plant-soil interactions is essential for a comprehensive understanding of fire's ecosystem-wide effects.