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I think that there are other solutions too. One would be to have controlled burnings of areas of forest, to remove the layer of fuel on the ground. Another is to "high prune" trees (remove the lower branches), so that these lower limbs don't transfer the fire from the ground to the canopy.
In many ecosystems, forest fire is a benefit, and is a natural element of the forest cycle. You need to consider the species too. Some species like the Eucalypts have highly resinous leaves and bark, and go up like a torch. However, the main part of the tree survives and self-coppices. In California, some of the trees are very thickly barked as a fire protection. But the cones need fire in order to open and cast their seeds.
The problem (and it's only a problem as far as humans are concerned) is that forest fires are extremely hot and move very quickly - they are a kind of flash fire. There is a great deal of open structure, and preventing oxygen from getting in would be a real challenge.
I'm not familiar with thermobaric bombs or the area under which they are effective,
Blast radius is 450 feet (137.61m, 150 yards), though the massive shockwave created by the air burst is said to be able to destroy an area as large as nine city blocks.