【摘要】 通过对大青杨优良无性系7号杨在退耕还林地上造林试验,结果表明:7号杨根苗树高、地径、胸径分别超对照中黑防67.2%、53.4%和81.3%;7号杨扦插苗树高、地径、胸径超过对照A5杨104.4%、104.5%和119.3%;无性系7号杨根苗造林效果好于扦插苗;根苗造林可提高成活率25~30个百分点。更多还原

【Abstract】 Experiments of superior clones——No.7 Populus ussuriensis are conducted in the forest land returning from farm.Result shows that: tree height,ground diameter,DBH of seedling with root of No.7 Populus ussuriensis is 67.2%,53.4% & 81.3% more than that of Populus deltoids ×P.cathayana respectively;tree height,ground diameter,DBH of cutting stock of No.7 Populus ussuriensis is 104.4%,104.5% & 119.3% more than that of A5 respectively;effect of afforestation by using seedling with root of No.7 Populus ussuriensis is optimal than that of cutting stock of No.7 P.ussuriensis;afforestation by using seedling with root can increase the survival rate by 25-30%.更多还原