刺槐优良无性系种源较少,采用细根段催芽育苗,可以加快良种繁育速度,而且方法简便易行,成活率可达95％以上。在去冬上冻前或春季育苗前,从优树的根部挖取0.2—1厘米粗的树根,剪成3—4厘米长的根段。5月初,在育苗地上做宽1米、深10厘米、长依根段多少而定的催芽畦。畦里灌透底水,待水渗下后,把剪好的根段撒播在畦内,覆土厚度以不露根段为度,再喷少量水,盖上塑料薄膜。以后要每天喷洒一次水,以保持床面湿润。约10天左右就可长出芽苗,当芽苗3—4厘米高时进行移栽。移栽应在下午4点以后进行,垄作每米长移 Robinia pseudoacacia less clonal germplasm resources, the use of fine root segment germination nursery, can speed up breeding speed, and the method is simple and easy, the survival rate of up to 95%. Before winter frost or nursery before spring, dig a root 0.2-1 cm thick from the roots of the tree, cut into 3-4 cm long roots. Early May, in the nursery on the ground to do 1 meter wide, 10 cm deep, according to the number of roots according to the number of germination 畦. After filling the bottom water, pour the water under it and then sow the cut root segments in the 畦. The thickness of the soil cover should not be exposed to the root segment, then add a small amount of water and cover the plastic film. After spraying water once a day to keep the bed moist. About 10 days to grow buds, when the sprouts 3-4 cm high when transplanting. Transplanting should be carried out after 4 pm, the ridge for each long shift