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How can fire trigger seeds in a soil seed bank to germinate?
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Dormancy
Virginia big-eared bats (Corynorhinus townsendii virginianushibernating) are true hibernators, entering a state close to death for much of the winter.
In ecosystems prone to wildfire, fire acts as a critical environmental signal that triggers the germination of seeds stored in the soil seed bank. This process typically occurs through two primary mechanisms:
- Heat Pulse: The intense heat generated by a fire can penetrate the soil, providing a thermal stimulus that breaks seed dormancy. This heat can also physically damage or weaken hard, impermeable seed coats, allowing for the necessary uptake of water and oxygen required for germination.12
- Chemical Signals: Smoke and charred wood produced during a fire release specific chemical compounds that stimulate germination. The most significant of these is a butenolide known as karrikin, which is derived from the burning of cellulose. Karrikin acts as a powerful chemical trigger that can initiate the germination process in many fire-adapted species.123
These adaptations ensure that plants can capitalize on the post-fire environment, where competition from other vegetation is reduced and nutrient availability may be temporarily increased.2