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从白榆优良种源区的优良家系中选择优良单株,或从优树家系中选择优良单株,嫁接形成无性系,通过苗期选择和多点多年造林测定,选育出两个白榆新无性系—鲁榆(选)四号、五号。具有显著的遗传增益,材积生长量超过对照。证明充分利用优良种源—优良家系—优良无性系的联合选种效应的技术路线,可获得较大的遗传效益。
From elite elite provenances, excellent individuals were selected, or elite individuals were selected from elite tree families to form clones by grafting. Two new elm clones were selected through seedling selection and multi-year afforestation - Lu Yu (election) on the 4th, on the 5th. Has a significant genetic gain, volume growth over the control. Proved to make full use of elite provenance - elite families - fine clonal selection effect of the technology route, access to greater genetic benefits.