通过观察初果期李树根系在不同土层中的分布状态及根着生角度 ,为了解李树根系分布及改进施肥制度提供依据。1　材料与方法1 997年秋末结合昌黎镇二村李树园改造酿酒葡萄园刨树 ,对李树根系进行了观察。该园土壤为轻壤土 ,砧木为毛桃 ,品种为牛心李 ,株行距 3ｍ× 4ｍ ,5年生。 By observing the distribution and roots of plum roots in different soil layers in early stage, we can provide basis for understanding root system distribution and improving fertilization system. 1 Materials and methods 1 997 late autumn combined with the village of Li Liyuan Changli wine vineyard planing trees, the roots of the plum tree were observed. The garden soil is light loam, rootstock is peach, breed cow heart-shaped, spacing 3m × 4m, 5-year-old.