【摘要】 [目的]探索黑木相思人工林的最佳造林密度，为其经营管理提供依据。[方法]以不同造林密度(2 500、1 667、1 333株·hm^-2)的黑木相思人工林为研究对象，分析其林分平均树高、胸径和单株材积等生长指标，并探讨了林分保存率及蓄积量的变化规律。[结果]造林密度总体上对黑木相思幼林树高、胸径、单株材积和林分蓄积量的影响显著，对保存率影响不显著。6年生黑木相思人工林平均树高随造林密度增大呈先增大后减小趋势，以1 667株·hm^-2林分（18.35 m）最大；平均胸径、单株材积、保存率均随造林密度增大而逐渐减小，其中1 333株·hm^-2林分平均胸径（14.91 cm）和单株材积（0.104 5 m³）最大、大径材（>14径级）分布百分比（46.30%）最大、保存率（99.33%）最高；林分蓄积量随造林密度增大而增大，其中2 500株·hm^-2林分蓄积量(211.287 m³·hm^-2)最大。[结论]营造短周期工业用材林宜选择2 500株·hm^-2的造林密度，培育大、中径级材以1 333株·hm^-2造林密度为宜。可根据经营目的，以2 500株·hm^-2的初始密度造林，之后再进行间伐抚育，以实现黑木相思树种经济效益最大化。更多还原

【Abstract】 [Purpose] This study aims to explore the optimal planting density of Acacia melanoxylon and provide useful information to improve plantation management. [Method] In A.melanoxylon plantations with different afforestation densities(2 500, 1 667, 1 333 stems·hm^-2), growth indicators including average tree height, diameter at breast height（DBH）, and individual tree volume were measured, and the variation in survival rate and stand volume were analyzed. [Result] Planting density has generally significant effects on the tree height, DBH, individual volume and stand volume, rather than survival rate. 6-year-old A.melanoxylon plantations with the increase of planting density average tree height of first increased and then decreased, with the maximum at 18.35 m by 1 667 stems·hm^-2. Average DBH, individual volume and survival rate eventually decreased with higher planting densities. The stand with the density of 1 333 stems·hm^-2 witnessed largest average DBH（14.91 cm） and individual volume（0.104 5 m³）, as well as highest proportion（46.30%） of large diameter timber（>14 grades） and survival rate（99.33%）. Stand volume increased with planting densities, with the peak of 211.287 m³·hm^-2 in the stand with 2 500 stems·hm^-2. [Conclusion] The planting density of 2 500 stems·hm^-2 is recommended for short-rotation industrial timber plantation, while planting density of 1 333 stems·hm^-2 is suitable for cultivating large and medium diameter timber. Oriented by management objectives, the planting density of 2 500 stems·hm^-2 could be initiated, followed by thinning, to maximize economic benefits from A.melanoxylon.更多还原