河北省围场县大焕起林场,一般为山地阳坡,表层只有20—30cm,黑褐色沙壤土,以下则是深为50—100cm 的黄沙土,在这种环境下有大量酸模生长,其根部最大直径可达20cm,一般在5—100cm 左右,韧皮很厚,最厚可达1.5cm。由于生长在沙土上,风吹沙动、根部完全裸露,极易取得,因此来源 Dahuanqi Forest Farm in Weichang County, Hebei Province is generally a mountain slope with a surface layer of only 20-30cm, dark brown sandy loam soil, and the following is yellow sand soil with a depth of 50-100cm. In this environment, a large number of acid molds grow and the root The maximum diameter of up to 20cm, usually about 5-100cm, bast thick, the thickest up to 1.5cm. As the growth in the sand, wind and sand move, the roots completely exposed, easily obtained, so the source