为选择适宜中亚热带平原湖区栽培的优良速生杨树品种,1977年元月,我们从南京林学院引进了黑杨派六个新无性系。通过七年的引种试验,认为其中有三个无性系:I-63、I-69、I-72是较好的品种。现已在洞庭湖区造林10.5万多亩,普遍生长良好。一、试验材料引进的六个无性系是:I-214、I-45、I-72、I-63、I-69和加龙杨。与此同时进行试验的还有欧美杨I-455、北京杨、小黑杨、吉林1号杨等无性系。二、引种地区的立地条件试验地区的年平均气温为16.7℃,极端最 In January 1977, we selected six new clones of black poplar from Nanjing Forestry College in order to select good fast-growing poplar varieties suitable for cultivation in the subtropical plains lake area. After seven years of introduction test, three clones were considered: I-63, I-69 and I-72 are better varieties. Is now in the Dongting Lake afforestation 105,000 mu, generally good growth. I. The six clones introduced in the test material are: I-214, I-45, I-72, I-63, I-69 and Garonne. At the same time as the test there are Europe and the United States Yang I-455, Beijing Yang, Populus, Jilin 1 Yang and other clones. Second, the introduction of the site site conditions Test area of ​​the annual average temperature of 16.7 ℃, the most extreme