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山海关林场部省联营油松良种基地,用油松短枝(针叶束)嫁接技术,繁殖优良无性系苗木,建立改良代种子园150亩,当年高生长9cm,生长良好。
In Shanhaiguan Forest Farm, the best seed orchard of 150 hectares is grown in the base of Pinus tabulaeformis hybrids. The excellent seedlings of clones are propagated by the spruce branch of Pinus tabulaeformis.