Wildfires can transform forest ecosystems to varying degrees, depending on fire severity. While low-severity wildfires change plant community composition by killing short-statured trees and understory plants, high-severity fires result in top kill of above-ground vegetation. This variation in wildfire effects can have major impacts on post-fire vegetation composition and water stress. Helen Poulos, adjunct assistant professor of environmental studies, received a $300,000 grant from NASA on Dec. 5 to examine how forests can permanently change in response to high-severity wildfire in southeastern Arizona. (more…)