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    唐继新, 贾宏炎, 曾冀, 蔡道雄, 韦叶桥, 农良书, 雷渊才. 密度对米老排萌生幼龄林生长及直径分布的影响[J]. 北京林业大学学报, 2018, 40(5): 46-54. DOI: 10.13332/j.1000-1522.20170291
    引用本文: 唐继新, 贾宏炎, 曾冀, 蔡道雄, 韦叶桥, 农良书, 雷渊才. 密度对米老排萌生幼龄林生长及直径分布的影响[J]. 北京林业大学学报, 2018, 40(5): 46-54. DOI: 10.13332/j.1000-1522.20170291
    Tang Jixin, Jia Hongyan, Zeng Ji, Cai Daoxiong, Wei Yeqiao, Nong Liangshu, Lei Yuancai. Effects of density on growth and diameter distribution of young coppice stands of Mytilaria laosensis[J]. Journal of Beijing Forestry University, 2018, 40(5): 46-54. DOI: 10.13332/j.1000-1522.20170291
    Citation: Tang Jixin, Jia Hongyan, Zeng Ji, Cai Daoxiong, Wei Yeqiao, Nong Liangshu, Lei Yuancai. Effects of density on growth and diameter distribution of young coppice stands of Mytilaria laosensis[J]. Journal of Beijing Forestry University, 2018, 40(5): 46-54. DOI: 10.13332/j.1000-1522.20170291

    密度对米老排萌生幼龄林生长及直径分布的影响

    Effects of density on growth and diameter distribution of young coppice stands of Mytilaria laosensis

    • 摘要:
      目的伐桩萌条保留密度是萌生林培育经营的关键技术。本研究旨在探索密度对米老排萌生林生长及直径分布的影响,进而确定米老排萌生林的合理经营密度。
      方法以米老排人工林皆伐迹地伐桩萌条为试验对象,采用单因素随机区组试验设计,设计了3种留萌处理(TCA:保留1株/桩,TCB:保留2株/桩,TCC:保留3株/桩),3次重复,共9块固定样地;基于固定样地5年的连续观测数据,对3种不同密度米老排萌生幼林的生长及直径分布进行研究。
      结果(1) 除萌后1~3.5年,密度对萌生林平均的胸径、树高和单株材积的生长影响不显著,对萌生林优势木树高生长量影响不显著,对萌生林优势木单株材积的总生长量影响显著(P < 0.05),对萌生林优势木胸径总生长量与单株材积连年生长量影响极显著(P < 0.01)。(2)萌生林平均胸径、平均树高、优势木平均胸径和优势木平均树高的连年生长量峰值均出现在第2年;林分平均胸径的平均生长量曲线与连年生长量曲线的相交时间在3~4年之间,而林分平均树高的平均生长量曲线与连年生长量曲线的相交时间则在2~5年间。(3)第2年后,萌生林优势高和平均树高的连年生长量呈明显递减趋势。(4)萌生林直径分布遵从单峰正偏山状分布,处于竞争的自然稀疏后期,使用Weibull分布函数对萌生林的直径分布拟合效果良好。
      结论前5年为萌生林径向生长和高生长的旺盛期,合理保留密度及幼林抚育对萌生林的径向生长极为重要。每伐桩保留1~2株萌条的除萌措施,对提高萌生林优势木比例作用明显。

       

      Abstract:
      ObjectiveReserved density of the stump sprouts is the key technology in coppice cultivation. It is very important to explore the effects of density on growth and diameter distribution of coppice stands of Mytilaria laosensis in order to get reasonable density for cultivating technology with the stands.
      MethodUsing single factor randomized block designs, the experiment with the stump sprouts of Mytilaria laosensis in the clear-cut land of Mytilaria laosensis plantation, in three different levels of TCA(reserved 1 sprout each stump), TCB(reserved 2 sprouts each stump), TCC(reserved 3 sprouts each stump) and repeated three times, was conducted with 5 years continuous observation data in 9 fixed plots to study the growth and diameter distribution of the coppice stands affected by density.
      Result(1) During 1-3.5 years after sprouting thinning, total growth of the average diameter at breast height (DBH), average height, and average individual volume of coppices in the stands were not significantly affected by density. The growth of tree height for dominant trees of the sprout stands was not significantly affected by density. The total growth of individual volume for dominant trees of sprout stands was significantly affected by the density (P < 0.05), the annual increment of individual volume and the DBH growth of dominant trees were very significantly affected by density(P < 0.01). (2)All the peak values of annual increment of average DBH of stands, average tree height of stands, average DBH of top tree, and average tree height of the stands occurred in the second year, the intersected times of the average growth and annual growth of the stand DBH were during third year to fourth year, but the intersected times to the average tree height of the stands were during second year to fifth year. For the dominant trees, both intersected time of average growth and annual increment growth of DBH and tree height were very similar to the growth of stands. (3) After the second year, both annual increment growth of tree height with the dominant tree and the average tree obviously decreased. (4)All diameter distributions of coppices in the stands were part mountain shape distribution, which indicated that they were located in the late competition period. It had excellent fitting effects using the Weibull function to fit diameter distribution of coppices in the stands.
      ConclusionIt is fast growth period for the radial and height growth of the stands before 5 years old, reasonable density and tending are extremely vital to the stands. Thinning measures within two sprouts in each stump can drastically increase the proportion of superior trees in coppices in the stands.

       

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