Above: A slab of wood from the Stanislaus-Tuolumne Experimental Forest showing a history of very frequent fires, some of them as little as four years apart. Screen grab from the USFS video.
The U.S. Forest Service found some old research plots in the Sierras that have been measured over time dating back to the days of old growth. The evidence suggests that a diversity of species, density, and structure can make a forest more resilient to fire and attacks by insects.
