Impact of Fire and Heat Stress on Soil Microorganisms: A Review of Community Changes, Molecular Responses and Plant-Beneficial Roles.
Orozco-Mosqueda MDC, Flores-Piña A, Kumar A, Parra-Cota FI, de Los Santos-Villalobos S
Summary
PubMedWhy it matters This matters because the invisible world of soil microbes is what keeps your garden fertile — understanding how fire disrupts or resets that world helps explain why some landscapes bounce back quickly after wildfires while others struggle for years.
Soil is packed with trillions of tiny organisms — bacteria and fungi — that help plants grow by breaking down dead material and releasing nutrients. When fire sweeps through, it kills off some of these organisms while others, like certain tough fungi and bacteria, survive and even flourish. This reshuffling can actually give plants a short-term nutrient boost, but the long-term effects on farm fields and natural landscapes are complicated and still being studied.
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Wildfires and underground fires dramatically reshape the communities of bacteria and fungi living in soil, with some microbes thriving and others dying off. These shifts affect how nutrients cycle through the soil and ultimately influence how well crops and plants recover after a fire.
Key Findings
Fire-tolerant bacterial groups (Firmicutes and Actinobacteria) consistently increase in abundance after fire events, while less resilient bacteria decline — reshaping the entire underground ecosystem.
Resilient fungi such as Aspergillus, Penicillium, and Trichoderma play key roles in soil recovery after fire, helping to restore nutrient cycling and support plant regrowth.
Fire can temporarily boost microbial metabolic activity in organic matter breakdown pathways, creating short-term spikes in nutrient availability that accelerate plant recovery.
Abstract Preview
Fire, whether occurring on the surface or underground, significantly influences soil microbial dynamics by reshaping community composition, functional diversity and overall soil and plant health. T...
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