目前,许多地区培育的一年生杨、柳、榆苗木,多数达不到出圃造林的标准,需留床或换床后,再培育一年,留床苗虽然植株健壮,但根系的生长仍然得不到理想的改善;而采用换床、移植的方法培育,既费工又浪费土地。为了解决这个问题,笔者近年来采用坐床切根培育法,效果良好。具体做法是:在秋季树木落叶后,土壤结冻前,将生长一年的扦插苗(或播种苗)灌一次冻水,以防苗木冬季因干旱而枯死。次年春季,待土 At present, most of the annual poplar, willow and elm seedlings nurtured in many areas do not reach the standard for afforestation. They need to stay or change bed for another year. The growth of the root bed remains unbearable even though the plant is robust To the ideal improvement; and the use of exchange beds, transplant cultivation methods, both the waste of land and work. In order to solve this problem, the author in recent years using bed cutting root nurturing method, the effect is good. The specific approach is: in the autumn after the leaves of trees, soil freezing before the year-long cutting seedlings (or sowing seedlings) a cold water to prevent winter seedlings withered dead. The following spring, until the soil