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该文详细介绍了窄冠白杨６个无性系成年树的形态特征，并编制了成年树及苗期检索表，为识别这些无性系提供了依据。
In this paper, morphological characteristics of adult tree of six clones of Narrow Crown Poplar were introduced in detail, and adult tree and seedling retrieval table were compiled, which provided the basis for identifying these clones.