FRST 320 Lecture Notes - Lecture 5: Water Cycle, Polycyclic Aromatic Hydrocarbon, Soil Ph
Document Summary
Fire effects: soil, water, and air: fire effects on soil. Organic matter occurs in the upper soil horizons. Increases field capacity of soil (amount of water saturation) Soil heating maximum temperature and duration of elevated temperatures due to combustion determine impacts on soil at different depths. Only about 10-15% of heat from aboveground combustion is transferred to soils. Fuel complex (size, abundance, configuration) determines flaming versus smoldering combustion and heat transfer to the soil. Severity depends on surface versus crown fire, duration, and type of combustion. Review: mechanisms of heat transfer relevant for soil heating. Radiation transfer of heat by wave energy emitted from a source point. Majority of radiated heat from fire is lost to the atmosphere. Radiated heat accounts for the majority of heat transfer to soils. Conduction transfer of heat between molecules by direct contact, but particles are not displaced. Facilitates transfer of heat to deeper soil horizons.
