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沙地樟子松天然林林木大小分布特征

万盼 刘灵 赵中华 王千雪 胡艳波 王宏翔 惠刚盈

万盼, 刘灵, 赵中华, 王千雪, 胡艳波, 王宏翔, 惠刚盈. 沙地樟子松天然林林木大小分布特征[J]. 北京林业大学学报, 2017, 39(7): 1-9. doi: 10.13332/j.1000-1522.20170132
引用本文: 万盼, 刘灵, 赵中华, 王千雪, 胡艳波, 王宏翔, 惠刚盈. 沙地樟子松天然林林木大小分布特征[J]. 北京林业大学学报, 2017, 39(7): 1-9. doi: 10.13332/j.1000-1522.20170132
WAN Pan, LIU Ling, ZHAO Zhong-hua, WANG Qian-xue, HU Yan-bo, WANG Hong-xiang, HUI Gang-ying. Distribution characteristics of tree size of Pinus sylvestris var. mongolica nature forest on sandy soil[J]. Journal of Beijing Forestry University, 2017, 39(7): 1-9. doi: 10.13332/j.1000-1522.20170132
Citation: WAN Pan, LIU Ling, ZHAO Zhong-hua, WANG Qian-xue, HU Yan-bo, WANG Hong-xiang, HUI Gang-ying. Distribution characteristics of tree size of Pinus sylvestris var. mongolica nature forest on sandy soil[J]. Journal of Beijing Forestry University, 2017, 39(7): 1-9. doi: 10.13332/j.1000-1522.20170132

沙地樟子松天然林林木大小分布特征

doi: 10.13332/j.1000-1522.20170132
基金项目: 

国家自然科学基金项目 31370638

详细信息
    作者简介:

    万盼,博士生。主要研究方向:森林经营理论与技术。Email:wp7413841@163.com  地址:100091  北京市海淀区香山路中国林业科学研究院林业研究所

    责任作者:

    惠刚盈,研究员,博士生导师。主要研究方向:森林经营。Email:hui@caf.ac.cn  地址:同上

  • 中图分类号: S758.5

Distribution characteristics of tree size of Pinus sylvestris var. mongolica nature forest on sandy soil

  • 摘要: 分析内蒙古红花尔基沙地樟子松天然林直径和树高的一元和二元分布特征,以期为该区樟子松天然林进行抚育经营等提供科学依据。在内蒙古呼伦贝尔沙地南段的樟子松天然林中设置2块100 m×100 m的不同密度(940和1 149株/hm2)方形固定样地,按整体和分层的方法,对样地的林分直径和树高的变化规律及两者之间的关系进行研究。结果表明:1)2块样地林木的最大、最小直径及平均直径相等;低密度林分直径分布较分散,高密度林分则分布较集中。2块样地上、下层林木的平均直径均基本相同;低密度林分上层木直径分布为正态,下层木则左偏;高密度林分上层木直径分布左偏,下层木则为正态。高密度林分的平均树高大于低密度林分,但高大林木比例较低密度林分低;高密度林分上层木平均树高也大于低密度林分,且高大林木比例也较低密度林分高;而高密度林分下层木平均树高和高大林木比例均较低密度林分高。2)低密度林分中小径级林木株数比率小于大径级林木株数比率,高密度林分中则相反;低密度林分中小径级林木的林木树高与胸径的比值大于大径级林木的林木树高与胸径的比值,高密度林分中无明显差异。2块样地上层木小径级林木株数比率均小于大径级林木株数比率,其林木的树高与胸径在大、小径级中的比值也无明显差异;低密度林分下层木中小径级株数比率大于大径级林木株数比率,高密度林分则相反;2块样地下层林木在小径级林木中的树高与胸径比值均明显大于在大径级林木中的树高与胸径比值。可见,高密度林分的平均树高均大于低密度林分;高密度林分直径分布相对集中,低密度林分直径分布分散,从而造成不同密度的天然樟子松林林分平均直径无明显差异。低密度林分中大径级林木株数的比率要比高密度林分高;密度的不同也导致了林木径向和纵向生长的差异。因此,针对密度大的樟子松天然林分应适当疏伐,降低密度,减少种内竞争;而对密度小的林分应适当进行土壤植被管理,促进林下天然更新。

     

  • 图  1  2块样地的林分胸径分布

    Figure  1.  Distributions of tree DBH in two sample plots

    图  2  2块样地的林分树高分布

    Figure  2.  DIstribution of tree height in two sample plots

    图  3  2块样地直径-树高双变量联合分布三维图

    Figure  3.  Graphic representation of two bivariate mixtures involving DBH and height in the two sample plots

    图  4  2块样地胸径-树高双变量联合分布等值线图

    Figure  4.  Contour map of two bivariate mixtures involving DBH and height in the two sample plots

    表  1  沙地樟子松林基本特征

    Table  1.   Basic characteristics of Pinus sylvestris var. mongolica forests on sandy land

    样地
    Sample plot
    坡度
    Slope degree/(°)
    平均海拔
    Average elevation/m
    郁闭度
    Canopy density
    断面积/(m2·hm-2)
    Basal area/(m2·ha-1)
    平均胸径
    Mean DBH/cm
    平均树高
    Mean height/m
    密度/(株·hm-2)
    Density/(tree·ha-1)
    草本覆盖
    Coverage rate of herbaceous plant/%
    1<38150.733.621.314.8940>80
    2<38150.739.821.016.31 149<50
    下载: 导出CSV

    表  2  2块样地林层划分结果

    Table  2.   Results of layer classification in the two sample plots

    样地
    Sample plot
    第Ⅰ层LayerⅠ第Ⅱ层LayerⅡ第Ⅲ层LayerⅢ
    株数Tree number比例Proportion/%株数Tree number比例Proportion/%株数Tree number比例Proportion/%
    173678.3018319.47212.23
    287375.9727624.0300
    下载: 导出CSV

    表  3  林木胸径分布相关参数

    Table  3.   Distribution parameters of tree DBH

    样地Sample plot偏度Skewness峰值Kurtosis均值Mean/cm方差Variance变异系数
    Variable coefficient(Cv)/%
    标准差
    Standard deviation (Sd)/cm
    1-0.098 52.330 120.0652.92367.27
    20.152 62.494 919.8048.02356.95
    下载: 导出CSV

    表  4  不同层林木胸径分布相关参数

    Table  4.   Distribution parameters of tree DBH in different layers

    样地
    Sample plot
    林层
    Tree layer
    偏度
    Skewness
    峰值
    Kurtosis
    均值
    Mean/cm
    方差
    Variance
    Cv/%Sd/cm
    10.106 52.722 222.6931.65245.62
    1.145 04.518 710.5714.77363.84
    20.404 52.983 022.5230.05245.48
    0.737 55.755 211.198.36252.89
    下载: 导出CSV

    表  5  林木树高分布相关参数

    Table  5.   Distribution parameters of tree DBH

    样地
    Sample plot
    偏度
    Skewness
    峰值
    Kurtosis
    均值
    Mean/m
    方差
    Variance
    Cv/%Sd/m
    1-0.919 73.310 413.379.32233.05
    2-0.127 02.561 314.866.83182.61
    下载: 导出CSV

    表  6  不同层林木树高分布相关参数

    Table  6.   Distribution parameters of tree height in different layers

    样地
    Sample plot
    林层
    Tree layer
    偏度
    Skewness
    峰值
    Kurtosis
    均值
    Mean/m
    方差
    Variance
    Cv/%Sd/m
    1-0.060 82.253 214.702.76111.66
    -0.520 72.230 28.603.85221.96
    20.441 82.980 615.983.37111.83
    -0.668 12.654 611.321.2191.10
    下载: 导出CSV
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  • 收稿日期:  2017-04-14
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