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5 Cards in this Set
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occurrence
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southern hemisphere
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fire adaptations
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-some species only release seeds after heat of a fire opens their fruits
-some seeds germinate only after the seed coat has been cracked by heat from a fire -the smooth, light bark of some eucalyptus species reflects the heat of a fire, protecting the tree from understory burns -many fire-dominated eucalpyts have epicormic buds |
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epicormic buds
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-a cluster of vegetative buds under the bark which can sprout very quickly after a fire
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aboriginal fire-use
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-fire was used by aborigines to draw game--new, young growth attracts herbivores because of its high nutrient content and low ration of lignins and other structural materials
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fire intensity
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-intensity of a fire is integral in shaping the post-fire community (quick brush fire will leave much unburned, while canopy fire will take out whole forest)
-intensity is largely a function of the time since the last fire--if there is lots of accumulation of biomass, canopy burn is more likely. -severe burns lead to recolonization of even-aged stands |
