1972年底我国出席第七届世界林业会议代表团从意大利引进了一些杨树无性系,1975年我们从南京林学院引入10个杨树无性系,繁育后先后在南昌、新建、九江、瑞昌、湖口、都昌等县栽植。经初步筛选,以Ⅰ-63杨、Ⅰ-69杨、Ⅰ-72杨、Ⅰ-214杨表现较好。为深入探索其生长习性、生育规律和丰产栽培技术,并进一步进行无性系对比 At the end of 1972, our delegation to the Seventh World Forestry Congress introduced some poplar clones from Italy. In 1975, we introduced 10 poplar clones from Nanjing Forestry College. After breeding, they successively held five breeding programs in Nanchang, Xinjian, Jiujiang, Ruichang, Hukou, Duchang County planting. After preliminary screening, I-63 poplar, I-69 poplar, I-72 poplar, I-214 poplar performed better. To further explore its growth habits, fertility and high yield cultivation techniques, and further comparison of clones