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不同造林密度对巨尾桉生长的影响研究表明 :造林密度在 840～ 2 5 0 5株 /hm2 范围内 ,随着密度的增加 ,树高的速生期有着延长的趋势 ,而胸径及材积的速生期有着缩短的趋势 ;数量成熟期也随密度的增大而缩短 ;但密度过密不利于胸径、材积的生长 ,而过稀因早期冠幅的生长会抑制主干的生长 ,致使单株材积低且数量成熟期长 ,难以收到好的经济效益。结合培育目标及市场经济条件 ,确定造林密度宜采用 1 2 0 5～ 2 5 0 5株 /hm2 ,轮伐期为 4～6年。
The effects of different planting density on the growth of Eucalyptus grandis were studied. The results showed that the planting density was in the range of 840-2505 plants / hm2. With the increase of density, the fast growth of tree height tended to extend, but the fast growth of DBH and volume But the density is not conducive to the growth of DBH and volume. However, the growth of early crown will inhibit the growth of trunk, which leads to the low volume per plant And the number of mature period, it is difficult to receive good economic benefits. According to the objectives of cultivation and market economy, it is suggested that the density of afforestation should be 120-2505 plants / hm2 and the rotation period should be 4-6 years.