Growth strain evaluation in different species of eucalyptus plantation in south China

In order to evaluate the growth strain of both standing and fallen trees,a comprehensive research was carried out on eucalyptus trees from 5 plantations in south China, including Eucalyptus urophylla × E. grandis, E. urophylla, E. cloeziana, E. pellita and E. tereticornis. The results showed that: 1) there were highly significant differences in the mean growth strain from circumferential measurements on standing trees among different species; there was little difference in growth strain for the same height with different directions; 2) E. cloeziana, a new species developed for solid wood products, had the lowest growth strain level, but E. urophylla the highest in all five species tested; 3) three was no significant variation in growth strain measurement between standing trees and fallen trees in different species; 4) there was no significant difference in growth strain for tree height.