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传统造林用苗一般都在露地培育,裸根栽植。自本世纪六十年代起,国外由于木材供应严重不足,加上对森林保护环境的迫切需要,人工造林迅速发展,造林用苗量急增(传统的裸根苗在数量和质量上都不能满足造林事业对苗木的需要),于是发展了一套新的育苗造林技术,即容器育苗造林法。在生产中最先推广应用这一方法的是北欧。瑞典1970年容器苗产量约为1,800多万株,1974年增加到1.5亿株,增加约7倍,容器苗产量占整个产苗量的40%;挪威1976年国有林造林50%采用了容器苗,芬兰到1974年容器苗产量占苗木总产量的30%。
Traditional afforestation seedlings are generally cultivated in the open, bare root cultivation. Since the sixties of this century, due to the serious shortage of wood supply in foreign countries and the urgent need of protecting the environment, the afforestation has developed rapidly and the quantity of afforestation seedlings has increased sharply (the traditional naked root nursery stock can not meet the afforestation both in quantity and quality) Business needs of seedlings), then developed a new set of seedling afforestation technology, that is, container seedling afforestation Law. In the production of the first to promote the use of this method is the Nordic. The volume of container seedlings in Sweden was about 18 million in 1970 and increased to 150 million in 1974, an increase of about 7 times. Container seedling production accounted for 40% of the total seedling production. In Norway, in 1976, 50% of the state-owned forest was planted with container seedlings In Finland, container seedling production accounted for 30% of the total seedling production in 1974.