为优化水曲柳（Fraxinus mandshurica）优良家系综合评价体系，研究人员对 54 个 20 年生半同胞家系的 14 项生长、形态及木材性状指标进行测定。通过主成分分析等方法筛选出 9 个优良家系，发现基于隶属函数的评价体系准确性最高，为水曲柳遗传改良提供重要参考。

Steve Nix is a member of the Society of American Foresters and a former forest resources analyst for the state of Alabama. An ash tree commonly refers to trees of the genus Fraxinus (from Latin "ash ...