【摘要】 冀榆1号(Ulmus pumila‘Jiyu1’)是白榆的变异新品种,叶片较白榆大,树干特征明显,具有较高的景观价值。该文以白榆作对比品种,通过调查冀榆1号新品种特征、物候期,确定其新品种的优良特性以及生物学方面与普通白榆的区别;通过调查胸径、树高、材积,掌握其生长发育规律。结果表明:冀榆1号主干通直,叶片大,具有竹节式主干且光滑少纵裂,观赏价值高;冀榆1号2a的材积生长量与白榆相近,第2年至第6年的材积生长略有差异,白榆生长较冀榆1号快,第6年后,冀榆1号材积生长超过白榆。更多还原

【Abstract】 Ulmus pumila‘Jiyu no1’is a new variety of Elm with large leaves and obvious trunk characteristics,which is of high landscape value. In this paper,the characteristics and phonological period of the new variety were investigated and described,and the excellent characteristics of the new variety and the biological differences between the two varieties were determined. Through the investigation of DBH,tree height,volume,master its growth and development rules. The results showed that the main stem of Ulmus pumila ‘Jiyu no1’was straight,the leaves were large,the bamboo trunk was smooth and less longitudinal crack,and the ornamental value was high. The volume growth of Ulmus pumila‘Jiyu no1’was similar to that of Elm,but different in 2～6 years. The volume growth of Ulmus pumila‘Jiyu no1’was faster than that of Elm.更多还原