【摘要】 通过省内杨树主产区的品种资源调查，获悉乡土杨树有响叶杨、山杨、滇杨、大叶杨四种及其变种或类型；引种品种有几十种，但投入生产的只有十多种。经统计分析，揭示了它们生长量的差异以及影响其生长的主要因子和抗虫性能。结合生产需要和地区生态特点选择了良种。更多还原

【Abstract】 Through the species resource investigation of the main productive area in Guizhou province, the native populars are P. adenopoda Maxim,P. davidiana P. yunnanensis and P. lasiocarpa as Well as their varieties or types.We also have found that only ten to twenty species or clones have been Practiced among tens introduced speciesor clone. By statistics analysis, the paper reveals various popular’s differences in growth mass,the main factors affecting growth and ability against insect-pests.更多还原