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1 导言 日前,在日本林木育种计划中,建立柳杉优树无性系种子园,是繁殖柳杉的重要手段,据林业局1984年记录,柳杉优树无性系种子园在全国占地537ha,虽然柳杉种子园种子供应量逐年增加,但还是不能满足需求。然而,需要强调的是,在现有柳杉种子园中还有些难题需要解决。 首先,为获得种子的稳定丰产,通常需要建园后近10年的长期经营和大面积的
1 Introduction A few days ago, in Japan’s tree breeding program, the establishment of Cryptomeria trees clonal seed orchard, is an important means of propagation of cedar, according to the Forestry Bureau records in 1984, Cryptomeria trees clonal seed orchard in the country covers an area of 537ha, Although the seed supply of Cryptomeria seed orchard increased year by year, but still can not meet the demand. However, it is important to emphasize that there are still some issues that need to be addressed in the existing Cryptomeria fortunei. First of all, in order to obtain a stable and high-yielding seed, it usually takes a long-term operation and a large area