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在同一地块内,用白榆原株进行无性系造林,与其有性繁殖进行对比,其遗传增益可提高40%。白榆大多数无性系均超过家系的生长量。
In the same plots, the clonal reforestation of Ulmus pumila was compared with its sexual reproduction, and its genetic gain could be increased by 40%. White elm most clones exceeded the growth of the family.