Genetic Parameter and Gain Estimates of the Main Wood Properties and Growth Characters of Eucalyptus globulus and E.maidenii

In four blocks of breeding groups of 14 years old Eucalyptus seed orchard in Chengjiang county of Yunnan,the hereditability, genetic correlation and genetic gain of wood fiber length,wood density,height and DBH of Eucalyptus globulus and E maidenii were analyzed and estimated by sampling 30 families of each Eucalyptus species The individual tree hereditability of wood fiber length and wood density of E globulus were 0 674 5±0 074 6 and 0 354 6±0 101 0,while that of E maidenii were 0 341 6±0 101 1 and 0 067 0±0 085 0 The genetic correlation coefficient between wood fiber length and other three growth characters was positive,and the genetic correlation coefficient between wood density and height,wood density and DBH were negative Fiber length and height were the main selection characters of E globulus and E maidenii,the selection methods and selection standard were worked out The selection exponential equation of E globulus and E maidenii were I 1=Fr+9 914 6H and I 2=Fr+0 980 9H Besides,suggestions on advanced generation breeding of E globulus and E maidenii were proposed