Studies on Index Selections of Eucalyptus urophylla Families

A family-test forest including 49 open-pollinated families of Eucalyptus urophylla was built at Leizhou Forestry Bureau in Suixi County,Guangdong Province to examine the genetic performance of the families.The characteristics of height,DBH,individual volume,stem form,branch and survival rate were compared among different families at 3～5 year,the results showed that:(1) The most superior families under index selections include No. 109, 113, 66, 81 and 100; (2) With the 10.20%～55.10% selected rate, the genetic gain of single volume of the superior families in family-test forest was estimated to be 7.63%～15.80% at 3rd years, 3.92%～10.39% at 4th years and 6.08%～23.53% at 5th years.