Southwest Forests May Never Return After Age Of Megafires - Changed Soil, Changed Climate
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The last 10 years have seen more than 60 mega-fires over 100,000 acres in size in the West. When they get that big, firefighters often let them burn themselves out, over a period of weeks, or even months. These fires typically leave a scorched earth behind that researchers are beginning to fear may never come back as forest again.
Fires, of course, are a natural part of the forest lifecycle, clearing out old stands and making way for vigorous new growth out of the carbon-rich ashes. What is not natural is the frequency and destructiveness of the wildfires in the past decade -- fires which move faster, burn hotter, and are proving harder to manage than ever before. These wildfires are not exactly natural, because scientists believe that some of the causes, at least, are human-created.
For one thing, the intensity of the recent fires, researchers say, is in part the result of a warming and drying trend which has been underway for over a decade, and which some climate scientists believe will become a permanent condition as anthropogenic climate change continues to increase.
Experts also blame the fire-suppression policy which has been in effect for much of the last century. In the past, frequent low-intensity lightning fires left behind a park-like patchwork of woodlands and open meadows. The Smokey the Bear philosophy of fire prevention interfered with this natural pattern. By always putting fires out rather than letting them burn freely, forests throughout the West have become thick and overgrown.
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http://www.theatlantic.com/technology/archive/2013/07/the-southwests-forests-may-never-recover-from-megafires/277545/
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