论文部分内容阅读
对5年9个月生三种密度（1666株／hm~2、2222株／hm~2和3333株／hm~2）两种配置（16．66株／hm~2，株行距分别为2m×3m、1m×6m）尾叶桉试验林的研究表明：密度越大的林分，其冠幅、胸径、树高、单株材积、蓄积量就越小；密度间除保存率、林分蓄积量差异不显著外，其余性状的生长量均有显著的差异；3333株／hm~2的林分生长量明显低于其它两种密度。1666株／hm~2（株行距2m×3m）和2222株／hm~2的经济效益最好，定植5年9个月后可分别获得2．17、2．18倍营林费用的纯利润。在同是1666株／hm~2的情况下．株行距2m×3m的配置优于1m×6m的配置。视林地质量和经营措施的不同．1666株／hm~2（株行距2m×3m）和2222株／hm~2（株行距1．5m×3m）均是尾叶桉短周期（6年）工业用材林造林适宜采用的密度。
The results showed that the three density (1666 plants / hm ~ 2,2222 plants / hm ~ 2 and 3333 plants / hm ~ 2) of 5 years and 9 months were 16.66 plants / × 3m, 1m × 6m) Eucalyptus urophylla plantations showed that: the larger the density of the stands, the crown width, diameter at breast height, tree height, plant volume, the smaller the amount of accumulation; There was a significant difference in the growth of other traits except for no significant difference in stock volume. The stand growth of 3333 plants / hm ~ 2 was obviously lower than that of the other two species. The economic benefit of 1666 plants / hm ~ 2 and spacing of 2222 plants / hm ~ 2 was the best. After 5 years and 9 months of planting, the net profits of 2.17 and 2.18 times of silviculture were obtained respectively . In the same case of 1666 plants / hm ~ 2. The row spacing 2m × 3m configuration better than 1m × 6m configuration. Depending on the quality of forest and the different management measures. 1666 plants / hm ~ 2 and 2 22.2 plants / hm ~ 2 (plant spacing 1.5m × 3m) were suitable for the short-period (6 years) commercial plantation afforestation of Eucalyptus urophylla.