论文部分内容阅读
杨树是当今举世闻名的速生树种。世界各国对杨树之所以特别重视是由于它有许多优异的特性。1947年在联合国还设立了专门机构——国际杨树委员会。我国也成立了中国杨树委员会。作家茅盾还写有脍炙人口的《白杨礼赞》。世界各国多有研究杨树的机构,杨树文献浩如烟海,这说明杨树对人类生产、生活确实作出了重要的贡献。建国后,我国杨树栽培发展很快,全国有片林五千余万亩,四旁及农田林网栽植达50多亿株。华丽家族悠久历史杨树是双子叶植物中的杨柳科植物,雌雄异株的木本植物,雌雄花均为葇荑花序。
Poplar is the world-famous fast-growing tree species today. All countries in the world pay special attention to poplar because of its many excellent features. In 1947, the United Nations also established a specialized agency - the International Poplar Commission. China also set up the Chinese poplar committee. Author Mao Dun also wrote the popular “Poplar Praise.” Many countries in the world study the poplar’s body, poplar literature vast, which shows poplar on human production, life has indeed made an important contribution. After the founding of the People’s Republic of China, the poplar cultivation in our country developed rapidly. There were over 5,000,000 mu of forest in the country and more than 5 billion plants were planted on the four sides and the farmland. A long history of gorgeous family Poplar is a dicotyledon in the plant, dioecious woody plants, male and female flowers are broom.