进行本研究的目的是要弄清无性系桑树抗旱性的差异是否是由于根深,根重和根系的垂直分布状况所致。试验结果表明,上述诸因素中仅有根深对抗旱性造成了影响。根系生长较浅的无性系抗旱性较差,根系生长较深的无性系抗旱性较好。在根生较浅的无性中,抗旱性随着根生深度增加而增加;而在根生较深的无性系中,抗旱性与根生深度无关。 The purpose of this study was to determine whether the differences in drought resistance among mulberry trees were due to root depth, root weight and root vertical distribution. The test results show that only the root depth of the above factors has an impact on the drought resistance. The clones with shallow roots grew worse drought resistance and the clones with deeper root growth had better drought resistance. In the asexual root asexuality, the drought resistance increased with the depth of root growth; and in the root-deep clonal, drought resistance and root depth has nothing to do.