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川西林区为青藏高原东南缘.树种繁多、地形独特、土壤复杂.由于山高谷深,除受水平分异外,垂直分布异常明显,森林下分布为广的为山地棕色暗针叶林土是低纬高海拔而形成为世界上分布最南的土壤类型之一.
Due to the deep valleys and deep valleys, the vertical distribution is obvious except for the horizontal differentiation. The forest with dark brown coniferous forest is widely distributed under the forest Low latitude and high altitude to form the world’s most southern distribution of soil types.