[Objective] The aim was to provide theoretical basis for speeding up the popularization of Eucalyptus dunnii.[Method] Differences in phenolic compounds and related enzyme activities between hard rooting E.dunnii and easily rooting E.urophylla×E.grandis clone （U9） were studied.[Result] There were significant differences in contents of phenolic compounds and activities of indole acetic acid oxidase （IAAO）,andperoxidase （POD） and polyphenol oxidase （PPO） between the two Eucalyptus species.Compared with U9,contents of phenolic compounds and POD activity of E.dunnii cuttings were relatively high,while activities of IAAO and PPO were relatively low.[Conclusion] More phenolic compounds and the differences in related enzyme activities might be the major factors to result in hard rooting of E.dunnii cuttings.
The trial of 21 eucalyptus species/provenances at the 4.5 year old established at Kaiping City of Guangdong Province were analyzed.The results show that there are distinct differences on the increments of height,DBH and volume at the 4.5 year old among 8 species with different provenances,and Eucalyptus urophylla is the best species among 8 species.Among 5 provenances of E.urophylla ,Mandiri provenance (Seedlot No.17564) is the best provenance with a mean height,mean DBH,mean individual volume and volume increment of 13.44 m,11.45 cm,0.065 6 m 3 and 22.52 m 3·hm -2 ·a -1 respectively,which are respectively 1.49,1.87,6.02 and 6.24 times compared with that of E.exserta as contrast. E.urophylla from Mandiri is suggested to be extended in this area and carry out the genetic improvement based on E.urophylla from Mandiri provenance.
