池杉个体之间存在着显著的表型性状差异,在无性繁殖中表现出遗传上的稳定性。这为我们开展定向选择提供了依据。为了使我省农田林网、四旁绿化林木良种化,实现速生丰产,林带生长整齐平衡,尽快发挥防护效益和经济效益,我们从1977年以来连续三年进行了池杉无性系选择和早期测定试 There are significant differences in phenotypic traits among individuals of Ipomoea japonica, showing genetic stability in asexual reproduction. This provides the basis for our directional choice. In order to make our province farmland forest network, the planting of greening trees on four sides, to achieve fast-growing and yielding, neatly balanced growth of the forest belt, to play a protective and economic benefits as soon as possible, we have conducted three years of selection and early determination test