植有杨柳树的地方,一到春季柳絮满天飞,给人们带来不快,如吸入肺部,还会有损健康。但杨柳科树木大部分为雌雄异株,飘絮者仅系雌株,而这类树种多具有无性繁殖能力,因此,多繁育和栽植一些雄株,就可以改变这种情况。雌雄株的区别是:旱柳(柳扬、柳、河柳)雄花具雄蕊2,花丝分离,其背 Willow trees planted place, a spring catkins fly, bring unpleasant to people, such as inhalation of the lungs, but also detrimental to health. However, the majority of willow branches of trees dioecious, fluttering who only the female plant, and more of these species have asexual reproduction, therefore, more breeding and planting some male plants, you can change this situation. Male and female strains of the difference is: Salix (Liu Yang, willow, river willow) male flowers with stamens 2, filament separation, the back