The north temperate zone components are preponderant, Picea, Abies, Betula and Sabina are the constructive species or the dominant species in most of the forest vegetations in the 3 regions.

• 委陵菜属、凤毛菊属、黄芪属、马先蒿属、苔草属这五个属是三个林区植物共有的前十个优势属。 北温带成分占绝对优势,北温带成分中的云杉属、冷杉属、桦木属、圆柏属植物是构成这三个林区几乎所有森林植被类型的建群种或优势植物。