Abstract:

The effect of different thinning intensity(1/2,1/3,1/4,CK) on the DBH, height, volume and biomass were studied by random block experiments in 3-year-old Eucalyptus grandis × E.urophylla plantation that the planting density was 1 650 trees·hm^-2.According to located investigations of standard area in successive 3 years before and after thinning,the results showed that the effects of thinning intensity on the DBH, the individual standing volume of forest were extremely remarkable, and that on the height,volume and biomass of stands were not remarkable. Based on the experiment results, intermediate cutting can improve the productivity of E.grandis × E.urophylla plantation,and when the density of reserve-tree after intermediate cutting was about 1 100 tree·hm^-2,the productivity of stand would be highest.

Key words: Eucalyptus grandis×, E. urophylla, Thinning intensity, Density, Productivity, Biomass