Effect of Forest Fires

Typically, this weather occurs due to westerly flow disturbance along the Arctic front. At the surface, the expiration anticyclones (high pressure aras) bring periods of high temperature and low humidity. This weather may last anywhere from a few days to a month.

High pressure ridges tend to develop over Alaska, the Yukon and the northwestern United States Territories of Canada. As summer progresses, the center of origination shifts to the east. Once formed, the ridges loosely move in a southeasterly direction (Johnson, 1992, p. 19).

after a period of high temperatures, any breakdown in an atmospheric ridge can lead to forest squeeze out. Thunderstorms and lightning ar generally associated with the warmer, un persistent air of low pressure areas. In addition, high and variable winds in front of or seat the atmospheric trough provide a mechanism for can spread. Brotak and Refsnyder (1976) found that of major wildland fires in North America, most stick with the passage of a cold front (Johnson, 1992, p. 19).

Once a forest fire has begun, a tot up of complex processes experience to occur. Initially, the fire spreads by heating and then igniting unburned woody and herbaceous supplys (Johnson, 1992, p. 22). This involves the evaporation of any remaining moisture within the fuel and the thermal breakdown of cellulose, as well as the ignition system of volatiles to produce a visible flame. Heat is transferred primarily by convection and radiation as the front c

Matlack, Glenn R.; Gibson, David J., & Good, Ralph E. (1993, b., February). Regeneration of the shrub Gaylussacia baccata and associated species after low gaudiness fire in an Atlantic coastal plain forest. Am. diary of Botany, 80, 119 126.

It is during this phase of the forest fire that flames may extend up and ignite tree crowns (Johnson, 1992, p. 47). The crown layer includes hold up branches and leaf within the canopy. Between the crown and the surface exist the split up fuels. These may consist of intermediate sized trees, saplings, arboreal lichens, and live or dead lower branches.

As a egress of this variability, forests actually tend to be mosaics of tree stands, each having contrary times since they last burned.

Tree populations are therefore never examined on an individual basis. Instead, trees are usually examined as groups. These populations are divided on the basis of birth and death schedules, and so on

After flaming combustion has passed, glowing combustion subsequently takes place. This second phase of forest fire oxidizes any balance wheel carbon at the surface. In most forests, the ground is cover by layers of duff. Duff consists of soil and a swarm layer. This litter layer may include leaves, needles, herbaceous vegetation, low and median(a) shrubs, tree seedlings, stumps and dead tree boles and branches. The ligin components of these materials are very stable when heated; they produce a carbonaceous compound called ignite (Johnson, 1992, p. 3940). Glowing combustion is surface oxidation of this char. The net result of the process is preparation of the forest floor for the offset of new seedlings (Johnson, 1992, pp. 2247).

In purely deciduous forests, fire frequency may have some effect on stand structure. By injuring trees, fire may contribute to the number of treefall gaps. These gaps are subsequently exploited by an array of trees which are adapted to different degrees of shade, canopy plosive
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