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日本从1957年开始有计划地进行以选优建园为中心的林木育种工作。为此,从中央到地方健全了林木育种机构。各级机构职责清楚,分工明确。林野厅负责制订计划和统筹经费;林木育种协会、国立林业试验场和五个林木育种场负责重要项目的研究工作,以及组织鉴定和检查;都道府县林业试验场和营林局的育种机构负责初级选育,区域试验和推广工作。截止1978年,优树表型测验工作已告一段落,种子园工作初见成效。1977年种子园的产种量达4,000公斤,采穗圃的产穗量为1,270万穗。1979年上半年良种苗木占造林苗木的12％,预计到1985年将全部使用良种苗木造林。1969年以来,在不同的环境条件下
Since 1957, Japan has planned to carry out tree breeding work centering on the selection and construction of excellent gardens. To this end, from the central to local sound forest tree breeding institutions. The responsibilities of all levels of institutions are clear and the division of labor is clear. Forestry Office is responsible for planning and co-financing; Forest Breeding Association, the National Forestry Experimental Site and five forest breeding farms responsible for the research of important projects, as well as the organization of identification and inspection; prefectural forestry pilot plant and Yinglin Bureau of breeding institutions Responsible for primary breeding, regional trials and promotion. As of 1978, the excellent tree phenotyping test has come to an end, the seed orchard work has achieved initial success. In 1977, seed production was 4,000 kg in seed orchards and 12.7 million in spikes. In the first half of 1979, fine seedlings accounted for 12% of afforestation seedlings and it is estimated that by 1985, all seedlings will be used for afforestation. Since 1969, under different environmental conditions