通过观察箱和野外挖掘调查,对蓬 (Rubus hirsutus Thunb.)根系自然分布及生长发育特性进行了连续两年的观察记载。结果表明:其根系自然分布水平幅度为1.4×1.5m~2,垂直深度一般小于50cm,集中分布于10～25cm深的土层中;净增根数及根系总长度在5月底达最高峰,以后渐趋减少,根系最活跃期20cm土层深处土温为21℃,此时正是结果量最大的时期,地上部分高生长略滞后于根系生长,两者表现出同步协调性。

Root distribution and development characteristics of Rubus hirsutus Thunb. were investigated on plants both in fields and boxes in two successive years from 1990 to 1991. It was demonstrated that the natural scope of root is about 1. 4× 1. 5 m²wide and less than 50 cm deep. The accumulating zone is 10 - 25 cm in depth. It has been remarked from the observation box that the net increasing number and total length reach the summit at the end of May and decline gradually after then. The soil temperature of 20 cm is about 21 ℃ in the active period of root growth, while it is just the peak time of fruit. The development of the plant height is tardier than that of the root length.