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1959年起,我们从外地陆续引进了一百余种杨树品种,经过几年的苗期生长观察,以及在部分地区造林试验,初步认为合作杨、新疆杨、大关杨、群众杨、格尔里杨、波兰杨、欧美杨、北京杨等品种表现较好,在适宜的水肥条件下,它们具有比箭杆杨和小叶杨生长快、抗病虫害等优点,适宜在我区扩大推广.现简介如下:1.合作杨合作杨是以小叶杨为母本,钻天杨为父本人工杂交育成.1962年从中国林业科学院引入我区.经在银川、青铜峡、吴忠、灵武、盐池等地种植,均表现出明显的杂种优势.生长迅速,性状稳定,是引进杨树品种中表现最好的一个品种.合作杨生长通直,枝条细密,斜上生长,小枝有棱.树干幼时灰绿色,老时变成灰色,具有纵裂.叶广卵形,叶缘有钝锯齿,叶面深绿色,背面绿白色.繁殖容易,扦插育苗成活率高达90%以上.苗期生长比箭杆杨快.该品种定植后生
Since 1959, we have introduced more than one hundred species of poplar from the field successively. After several years of seedling growth observation and afforestation experiment in some areas, it is initially believed that the cooperation Yang, Xinjiang Yang, Dayuan Yang, Populus euphratica, Populus euphratica, Populus euphratica, Populus euphratica and other varieties performed well. Under the suitable conditions of water and fertilizer, they had the advantages of faster growth, resistance to pests and diseases than Populus euphratica and Populus euphratica, and were suitable to expand and popularize in our district. Brief introduction is as follows: 1 cooperation Yang cooperation Yang is the Populus as the female parent, drilling Tian Yang as the male parent hybrid breeding .1962 from the Chinese Academy of Forestry into my district .In Yinchuan, Qingtongxia, Wuzhong, Lingwu, Yanchi and other places Planting, showed obvious heterosis. Rapid growth, stable traits, is the introduction of poplar varieties in the best performance of a variety of cooperation Yang growth straight, branches fine, oblique growth, branchlets edges. Green, the old gray, with vertical split leaf broad oval, leaf edge with a sawtooth, dark green leaves, the back of the green and white reproduction is easy, cutting seedling survival rate as high as 90% Yang fast. The species colonization afterlife