How has the douglas-fir adapted to enable its survival in the taiga biomes?

The Coast Douglas Fir is a perennial, woody plant which means it has longevity and continues growing for many years. One of these characteristics is that they have developed a bark that is thicker then many other species of trees. The bark is also almost cork-like in the way it is composed. The trees have also developed adventitious roots, which means that they grow directly out of the trunk.