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changing forest structure to modify wildfire behavior

denser stands of trees retain more water

doc-titleScience Basis for Changing Forest Structure to Modify Wildfire Behavior and Severity
quoteDense stands (canopy cover) tend to provide more shading of fuels, keeping relative humidity higher and air and fuel temperature lower than in more open stands. Thus, dense stands tend to maintain higher surface fuel moisture contents compared to more open stands (Andrews 1986).
sourceUSDA Forest Service technical report