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| 桂中地区不同造林密度下桉树无性系生长及经济效益研究 |
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李付伸,吕曼芳,彭雪迪,苏维剑,卢亮
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广西国有维都林场 广西来宾 546100,广西国有维都林场 广西来宾 546100,广西国有维都林场 广西来宾 546100,广西国有维都林场 广西来宾 546100,广西国有维都林场 广西来宾 546100
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| 摘要: |
| 桂中地区不同造林密度下5 a生桉树无性系生长及经济效益研究结果表明，各无性系径阶株数多分布在13、14径阶，虽造林密度不同，各径阶株数分布基本趋向于正态分布；3个无性系的平均树高、平均胸径差异不大，总体上随着密度的降低而略有增加，平均树高、平均胸径以2.0 m×4.0 m造林密度下的DH32 29无性系最大，分别为20.2 m、14.9 cm；蓄积量以2.0 m×3.0 m造林密度下的DH32 29无性系最高，达213.9 m3/hm2；DH32 29无性系在2.0 m×3.0 m造林密度下获得的财务净现值最大，相对盈利能力最强；内部收益率、投资利润率、投资利税率和投入产出比则以2.0 m×3.5 m造林密度获得最大值，分别达63.32%、41.89%、46.54%、14.94%。 |
| 关键词: 桉树 无性系 密度 生长量 经济效益 |
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| Research on Growth and Economic Benefit of Eucalyptus Clones with \=Different Density in the Middle Region of Guangxi |
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Li Fu-shen,LV Man-fang,, and
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Weidu Forest Farm of Guangxi,,,
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| Abstract: |
| The growth and economic benefit of five year old Eucalyptus clones with different density were researched. The results showed that most of diameter of test clones belonged to 13 or 14 diameter class, the distribution of the number of diameter in each diameter class tended to normal distribution, although planted with different density. The average tree height and DBH of three clones were slightly different, which had a slight increase with the reduction of density. The average tree height and DBH of DH32 29 clones, under 2.0 m×4.0 m afforestation density, reached 20.2 m and 14.9 cm, respectively. The volume of DH32 29 clones, planted with 2.0 m×3.0 m was the highest, reached 213.9 m3 per hm2. The financial net present value of DH32 29 clones, planted with 2.0 m×3.0 m, was the largest, which was the most profitable. Internal rate of return, return on investment, profit and tax investment ratio and input and output ratio under 2.0 m×3.5 m planting density could obtain maximum, which was 63.32%, 41.89%, 41.89%, 46.54% and 14.94%, respectively. |
| Key words: Eucalyptus clones density increment economic benefits |
