Fire Components
A fire regime describes the pattern that fire follows in a particular ecosystem. Its "severity" is a term that ecologists use to refer to the impact that a fire has on an ecosystem. Ecologists can define this in many ways, but one way is through an estimate of plant mortality. Fire can burn at three levels. Ground fires will burn through soil that is rich in organic matter. Surface fires will burn through dead plant material that is lying on the ground. Crown fires will burn in the tops of shrubs and trees. Ecosystems may experience predominantly one of these fire regimes, or a mix of all three.
Fires will often break out during a dry season, but in some areas wildfires may also commonly occur during a time of year when lightning is prevalent. The frequency over a span of years at which fire will occur at a particular location is a measure of how common wildfires are in a given ecosystem. It is either defined as the average interval between fires at a given site, or the average interval between fires in an equivalent specified area.
Defined as the energy released per unit length of fireline (kW m-1), wildfire intensity can be estimated either as the product of the linear spread rate (m s-1), the low heat of combustion (kJ kg-1) and the combusted fuel mass per unit area, or it can be estimated from the flame length.
Read more about this topic: Fire Ecology
Famous quotes containing the words fire and/or components:
“For lack of wood the fire goes out, and where there is no whisperer, quarreling ceases. As charcoal is to hot embers and wood to fire, so is a quarrelsome person for kindling strife.”
—Bible: Hebrew, Proverbs 26:20-21.
“Hence, a generative grammar must be a system of rules that can iterate to generate an indefinitely large number of structures. This system of rules can be analyzed into the three major components of a generative grammar: the syntactic, phonological, and semantic components.”
—Noam Chomsky (b. 1928)