Study on Wind-resistance of Young Eucalypt Plantation at Different Stand Density

Growth,root and wind damage of two one-year-old eucalyptus clones(Eucalyptus grandis×E.tereticornis clone DH201-2 and E.urophylla×E.grandis clone DH32-29) were studied in six stand densities(1250,1667,2500,5000,6667 and 10000 trees·hm-2),and correlation analysis stand density,growth,root and wind resistance was carried out.The results showed that DH201-2 had the maximum growth at density of 1667 trees·hm-2,diameter at breast height and crown of DH32-29 were the best at density of 1667 trees·hm-2 while the tree height was the highest at density of 5000 trees·hm-2.Growth of two clones at various densities were significantly different;2500 trees·hm-2 was the best density on wind-resistance for DH201-2,whilst DH32-29 of six densities all were not ideal;In the same density,the total root number and the root number from 0 to 2 cm of DH201-2 were more than that of DH32-29,but the crown of DH32-29 was larger than that of DH201-2,so DH201-2 was broken and DH3229 was lodged easily;DH201-2 was better than DH32-29 on wind-resistance in the same density.