The risk of catastrophic wildfire likely increases in areas where bark beetle-killed trees are not removed. Other long-term impacts are largely unknown. However, potential negative impacts could be: loss of soil due to accelerated erosion, increases of invasive plant species in response to disturbance, and decreases in real estate value on properties where tree losses were very high.
The disturbance caused by bark beetle mortality will undoubtedly change vegetative characteristics. Some of these changes could be perceived as beneficial to the impacted ecosystems. A significant reduction in woody species will likely be accompanied by an increase in herbaceous species, such as grasses and forbs. These species have reduced water consumption and are desirable forage for wildlife and domestic livestock. In addition, grasses have fibrous root systems that stabilize soil and aid in soil development. The reduced water consumption could also result in increased water yields from impacted watersheds. This increase in water yield could potentially help recharge local and regional aquifers. Other potential ecosystem benefits will certainly be recognized over time.
Jeff Schalau, Associate Agent, University of Arizona, and Tom DeGomez, Area Agent and Regional Specialist, University of Arizona
