EARTHSC 2GG3 Lecture Notes - Lecture 34: United States Forest Service, Understory, Lightning

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Lecture 34, november 22, 2012: fire process and behavior, wildfires are natural part of forest evolution, approximately 8,000 wildfires occur each year in canada. The average area burned in canada is 2. 5 million ha/year: benefit ecosystems by. Permitting growth of different species and age groups of trees. Figure: number of fires by year in canada. Courtesy of canadian interagency forest fire centre (ciffc) Type of fuel available, its distribution and moisture content determine how quickly fire ignites and spreads. Without any one of these, a fire cannot burn: primary sources are trees and dry vegetation, burn at high temperature by reaction with oxygen in air, cellulose: compound of carbon, hydrogen and oxygen. Breaks down to carbon dioxide, water and heat: natural oils and saps add to combustibles. Large relative surface area accelerates ignition and burning: heavy fuels with small surface area ignite with difficulty and burn slowly.

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