对2.5 a生尾叶桉26个种源194个家系测定林进行调查结果表明,生长量最大的种源为20687号,其树高、胸径、材积平均值分别为10.41 m、10.43 cm、0.040 64 m3,分别是种源群体均值的111.10%、114.36%、135.60%。生长量最大的家系是89号,其平均单株胸径、树高、高径比和材积分别为10.61 cm、10.30 m、0.99和0.042 08 m3,分别是群体均值的118.28%、110.28%、95.19%、143.47%。通过综合权重评分法共筛选出来自12个种源的36个早期表现较优良的尾叶桉家系。 The survey of 194 families of provenances from 26 provenances of Eucalyptus urophylla from 2.5 a showed that the largest provenance was 20687 with the average tree height, DBH and volume of 10.41 m, 10.43 cm and 0.040 64, respectively m3, respectively, which were 111.10%, 114.36% and 135.60% of the mean values ​​of the provenances. The largest growth family was 89, and the average DBH, tree height, height-diameter ratio and volume were 10.61 cm, 10.30 m, 0.99 and 0.042 08 m3, respectively, which were 118.28%, 110.28% and 95.19% , 143.47%. Thirty-six Eucalyptus urophylla families with good early-age performance from 12 provenances were screened out by comprehensive weighted scoring method.