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1987—1990年,中国林科院组织了有5个省市参加的杨树引种栽培协作组,从4个国家引进了25个杨树无性系。通过10多年的实验研究,由从巴基斯坦提供的7个杨树无性系中,优选出3个半常绿-常绿优良的无性系:A-65/27、A-65/31和A-61/186。经5省市栽培实践表明,它们容易繁殖、适应性强、生长快、造林成活率高、材质好,适于营造用材林和“四旁”绿化。其最大特点是:在我国南方,冬季不落叶或半落叶,生长时间长达10个月以上。这在杨树引种史上有所创新,使我国杨树栽培区扩大到福建、广东、云南和四川等省的南部以及长江中下游各省。
From 1987 to 1990, the Chinese Academy of Forestry organized a collaborative poplar cultivation group with 5 provinces and cities, and introduced 25 poplar clones from 4 countries. Through more than 10 years of experimental research, from the seven poplar clones provided by Pakistan, three semi-evergreen-evergreen clones are preferred: A-65/27, A-65/31 and A-61 / 186. The practice of cultivation in five provinces and municipalities showed that they are easy to multiply, adaptable, fast growth, high afforestation survival rate, good material, suitable for creating timber forest and “four sides ” afforestation. Its biggest feature is: in southern China, winter leaves or semi-deciduous leaves, the growth time of up to 10 months or more. This has made some innovations in the poplar introduction history, expanding our poplar cultivation area to the southern provinces of Fujian, Guangdong, Yunnan and Sichuan, as well as the provinces in the middle and lower reaches of the Yangtze River.