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选用4种不同密度马尖相思幼林,采用单因素、随机区组设计进行造林试验。对4种不同密度3年生马尖相思幼林的胸径、树高、冠幅、枝下高生长进行了观测分析,用标准木的各器官干质量估测林分的生物量。结果表明:不同密度对3年生马尖相思幼林的胸径、树高、冠幅生长无显著性影响,对枝下高生长的影响到第3年时已趋明显,差异显著。3年生幼林生物量以密度为2 505株/hm2最高,鲜质量达59.24t/hm2,气干质量达24.33t/hm2;3 330株/hm2最低,鲜质量为42.97t/hm2,气干质量为17.33t/hm2。不同密度3年生幼林各器官生物量气干质量所占比率均为干>叶>枝>根>皮。
Four different densities of Acacia mangium forest were selected for afforestation using single factor and randomized block design. The DBH, tree height, crown width and branch height growth of 3 years old Acacia mangium plantations with different densities were observed and analyzed. The biomass of each stands was estimated by the dry weight of each organ of standard wood. The results showed that there was no significant effect of different densities on DBH, tree height and crown width of three-year-old Acacia mangium plantation. The biomass of 3-year-old young forest was the highest with the density of 2 505 plants / hm2, the fresh mass was 59.24 t / hm2, the air-dry mass was 24.33 t / hm2, the lowest was 3 330 plants / hm2, the fresh mass was 42.97 t / Is 17.33t / hm2. The proportions of air-dry weight of biomass of three-year-old young plantations with different densities were stem> leaf> branch> root> husk.