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河北省木兰围场国有林场管理局总经营面积160.3万亩。在商品林中,落叶松面积290,987亩,占54%。一、3种落叶松的分布、形态特征和物候周期1.分布情况:华北落叶松原产于河北、山西两省,自然分布在北纬36°05’(山西霍山)～42°37’(河北坝上),东经111°05’～118°33’之间,垂直分布在海拔1200～2700米的阴坡。土壤以山地棕色森林土为主,也有灰色森林土与褐色土。
Mulan Weichang, Hebei Province State-owned Forest Farm Authority total operating area of 160.3 hectares. In the commercial forest, larch area of 290,987 mu, accounting for 54%. First, the distribution of three kinds of larches, morphological characteristics and phenological cycle 1. Distribution: Larix principis-rupprechtii native to Hebei and Shanxi provinces, natural distribution at 36 ° 05 ’north (Shanxi Huoshan) ~ 42 ° 37’ (Hebei dam ), East longitude 111 ° 05 ’~ 118 ° 33’, vertically distributed at an elevation of 1200 ~ 2700 meters of the shady slope. The soil is dominated by mountain brown forest soil and also has gray forest soil and brown soil.