金白杨在杨树人工林伐桩嫁接更新改造中的应用

Application of Jinbaiyang in Grafting with Stump Transformation and Renovation of Poplar Plantations

笔者针对山西北部大面积的杨树成过熟林分亟需更新改造的现状,按照"良种+良法"模式,在河流阶地、平川沙荒和黄土丘陵3种立地类型下,以抗逆速生的白杨优良无性系金白杨为换代品种,采用杨树伐桩嫁接更新改造技术,成活率达到94.8%以上。嫁接后金白杨快速形成自生根系,生长量超过群众杨,7年生金白杨树高达到11.5 m,胸径达到11.3 cm,郁闭度达到0.3,林相整齐。

According to the present situation that a large area of mature and over -mature forest need transformation and ren-ovation, Jinbaiyang as the replaced variety of stress resistance and fast-growing poplar clone ,grafting with stump transforma-tion and renovation of poplar was adopted in 3 site types of river terraces , sandy wasteland , loess hill with good seeds and cultivation method .Poplar survival rate reached 94.8%and Jinbaiyang grew quickly autogenetic root system after grafting . Jinbaiyang increment exceeded that of the crowd poplar .The height of 7 a Jinbaiyang reached 11.5 m, diameter at breast height reached 11.3 cm, canopy density reached 0.3, forest form tidied.