Forest fires happen. Well, accidents happen, too. But we try to avoid them. We try to avoid forest fires, too. And for the past 100 years, we have aggressively tried to put them out when they do happen. We had good reason to do so. After all, it is a disaster when a forest fire also burns down our house, or when a fire burns trees we were about to use for lumber to build houses. However, when I say that forest fires happen, I want to think about them differently. I want to think about forest fires in a natural forest. The key to thinking about forest fires is that in nature, forest fires happen. That is, forest fires are a natural, recurring event, usually caused by lightning.
What does it mean? Now, let’s think about the consequences of recurring forest fires: If forest fires are a natural occurrence, then it should be no surprise that the forest has adapted to these fires. And this is just what has happened. Trees have adapted to deal with fire in different ways. Some grow thick bark that protects them from fire. Others wait for a fire to release their seeds. These seeds are the key to generating a new forest.
Fire is necessary. Forests have not only adapted to tolerate fire. Fire is necessary to the healthy development of the forest. We often think of forests growing to their final mature state and living in perpetuity as old growth. We celebrate old growth as the ultimate state of a forest. We love the huge, mature trees and the diversity of life in a mature forest. However, such a forest is not sustainable. It may live in this mature state for hundreds of years, but eventually it will be altered by fire or some other disturbance. So it’s no surprise that some tree species not only tolerate fire, but depend on it. For example, Douglas fir needs bare earth created by a hot fire for its seeds to germinate. Trees that wait for fire to release their seeds also depend on fire. Many forest types depend on a large fire disturbance to regenerate.
|New life after a fire|
Forest ecologists now recognize that fire is a natural and necessary part of a forest ecosystem. So how should we think about the recent fire in the Columbia Gorge? It’s natural to think that our beautiful forests have been ruined. No one wants to hike through such a scorched and destroyed landscape. Well, we can take heart that not all the area the fire touched has been torched. And although some areas appear to be devastated now, they will regenerate. I saw this three years after the Dollar Lake fire on Mt. Hood. We can look forward to observing the same results in the Columbia Gorge. There is much we can learn about a forest when we see how it recovers from a fire.
|Three years after the 2011 Dollar Lake fire on Mt. Hood|
|Eagle Creek Fire Soil Severity Map|
Controlled fires. One strategy for dealing with wildfires is to set smaller controlled fires. The controlled fires remove the excess fuel form the forest, allow the forest to recover, and help prevent hot-burning wildfires. People often object to the smoke caused by controlled fires, but wildfires produce about 10 times the amount of smoke per acre compared to controlled fires. Controlled fires, by their nature can be set at times when weather conditions are conducive to good smoke dispersal and when the winds blow the smoke away from populated areas.
What can we do? We can speak up in favor of forest practices based on recent research for managing forests as an ecosystem that naturally includes fire. This may include the use of controlled fires in some cases. We can point out that these fires are healthy for the forest and healthier for people who live nearby. And most of all, we can avoid starting fires in dry canyons that all too often become destructive wildfires.
Sources and More Info.
Human-started wildfires expand the fire niche across the United States
How Will The Wildfires Of Today Fuel The Fires Of Tomorrow?
Western Wildfires and Climate Change
Eagle Creek Fire Soil Severity Map
After the Dollar Lake Fire