Variance analysis and multiple comparison indicate that differences in all characters of white elm half-sib families and clones are significan at 0.05 level or 0.01 level except for the ratio of fresh weight to dry weight among half-sib families.

• 方差分析和差异显著性检验的结果表明，除鲜/干比在半同胞家系间差异没有达到显著水平外，其它性状在半同胞家系间和无性系间差异均达到了显著或极显著水平。