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我省翁达、壤塘、炉霍、毛尔盖林区的大部分地区,新龙、道孚、松潘、红卫等林区的部份地区,因接近草原,在海拔3200米至4200米的地带,属高山山原区,气候变化无常,温度低,寒冷期长,年平均气温约在0—8℃之间,年极端最低温大部份地区在—20℃以下,如炉霍林区,年平均温度6.4℃,年降雨量646毫米,年蒸发量达1731.1毫米,为年降雨量的两倍多,绝对无霜期仅有11天。因此,成为整个川西滇北地区的一个特殊的低温地带。 本区森林只呈不连续的块状出现在窄谷及丘陵的阴坡与草甸及灌丛交错分布。主要树种
Most of the districts of Wengda, Lintang, Luhuo and Mogailin districts in our province, some areas of the Xinlong, Daofu, Songpan, Hongwei and other forest areas are close to the grasslands at an altitude of 3,200 to 4,200 meters , Belongs to the alpine mountain area, climate change is impermanent, the temperature is low, the cold period is long, the annual average temperature is about 0-8 ℃, the annual extreme low temperature most area below -20 ℃, like the stove Huoluo District , The annual average temperature of 6.4 ℃, the annual rainfall of 646 mm, the annual evaporation of 1731.1 mm, more than twice the annual rainfall, the absolute frost-free period of only 11 days. Therefore, it becomes a special low-temperature zone in the entire northwest Yunnan. The forest in this area showed only discontinuous lumps in the narrow slopes of the valleys and hills and the staggered distribution of meadow and shrubs. The main tree species