1999～ 2 0 0 1年 ,先后采用独立淘汰水平评选法和 3～ 5株优势木调查法 ,从实生苗、人工幼林和天然次生林中初选水曲柳优树 2 0 5个 ,对一部分优树通过无性系测定 ,复选出第一批优树 2 9个 ,为白蜡嫁接水曲柳提供了生长量大、适应性强的宝贵良种资源。水曲柳嫁接繁殖不仅受接穗影响 ,而且受砧木影响 ,因此砧木也要进行选优 From 1999 to 2001, the method of independent elimination and 3 to 5 dominance methods were successively applied. From the provenances, young plantations and natural secondary forests, 205 elite trees were selected, The tree was cloned by cloning, and the first batch of 29 elite trees was selected, which provided a precious seed resource with high growth and adaptability for ash graft. Fraxinus mandshurica grafting is not only affected by scion, but also affected by rootstocks, rootstocks should be selected