1972年底从意大利卡萨尔杨树研究所引入了美洲黑杨及欧美杨杂种的几个新无性系,自1975年开始在江苏南京,泗阳、沭阳、丰县、射阳、仪征、南通、武进、太仓、睢宁等地进行区域试验。四年来,这三个新无性系表现出生长期长,生长快,抗性强等优良性状,在黄河流域以南的广大平原地区颇有发展前途。本文报道了4年的试验结果。一、试验材料 At the end of 1972, several new clones of Populus nigra and Populus hybrids were introduced from the Poplar Institute of Cassar of Italy. Since 1975, they have been introduced in Nanjing, Siyang, Shuyang, Fengxian, Sheyang, Yizheng, Nantong and Wujin Taicang, Suining and other places for regional testing. In the past four years, these three new clones have shown good growth characteristics such as long growth period, fast growth, strong resistance and so on. They are quite promising in the vast plains south of the Yellow River basin. This article reports the results of four years of testing. First, the test materials