论文部分内容阅读
毛白杨(Populus tomentosa Carr)是用材林、防护林及“四旁”绿化的优良速生树种。由于种子难得,有性繁殖困难。采用无性繁殖育苗,虽有许多专家学者进行了广泛深入的研究,又由于种种原因,在生产上仍不能大面积应用。目前应用较普遍的是孙振海埋条法(以下简称常用法埋条),此法埋条成活较稳,但覆土厚薄不易掌握,影响幼苗出土和生长而降低产苗量,且种条用量较多,成本较高。为此,我们从1978年开
Populus tomentosa Carr is a good fast-growing species of timber, shelterbelts and “all around” greening. Due to rare seeds, sexual reproduction difficulties. Asexual breeding nursery, although many experts and scholars conducted extensive and in-depth study, but also for various reasons, still can not be applied in large areas. Currently more commonly used is the Sun Zhenhai buried strip method (hereinafter referred to as the commonly used method buried strip), this method buried strip survival more stable, but the cover thickness is not easy to grasp, affecting the emergence and growth of seedlings and reduce the amount of seedling production, ,higher cost. To this end, we opened in 1978