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长白落叶松人工林地位指数及立地形的比较研究

沈剑波 雷相东 雷渊才 李玉堂

沈剑波, 雷相东, 雷渊才, 李玉堂. 长白落叶松人工林地位指数及立地形的比较研究[J]. 北京林业大学学报, 2018, 40(6): 1-8. doi: 10.13332/j.1000-1522.20170400
引用本文: 沈剑波, 雷相东, 雷渊才, 李玉堂. 长白落叶松人工林地位指数及立地形的比较研究[J]. 北京林业大学学报, 2018, 40(6): 1-8. doi: 10.13332/j.1000-1522.20170400
Shen Jianbo, Lei Xiangdong, Lei Yuancai, Li Yutang. Comparison between site index and site form for site quality evaluation of Larix olgensis plantation[J]. Journal of Beijing Forestry University, 2018, 40(6): 1-8. doi: 10.13332/j.1000-1522.20170400
Citation: Shen Jianbo, Lei Xiangdong, Lei Yuancai, Li Yutang. Comparison between site index and site form for site quality evaluation of Larix olgensis plantation[J]. Journal of Beijing Forestry University, 2018, 40(6): 1-8. doi: 10.13332/j.1000-1522.20170400

长白落叶松人工林地位指数及立地形的比较研究

doi: 10.13332/j.1000-1522.20170400
基金项目: 

国家林业公益性行业科研专项重大项目 201504303

详细信息
    作者简介:

    沈剑波,博士生。主要研究方向:林业统计及生物数学模型。Email:lyshenjianbo@163.com 地址:100091 北京市海淀区香山路东小府1号中国林业科学研究院资源信息研究所

    责任作者:

    雷相东,研究员,博士生导师。主要研究方向:森林生长模型。Email:xdlei@caf.ac.cn 地址:同上

  • 中图分类号: S758.5

Comparison between site index and site form for site quality evaluation of Larix olgensis plantation

  • 摘要: 目的以吉林省长白落叶松人工林为对象,分析立地形与地位指数及其与林分生产力之间的关系,检验立地形评价长白落叶松人工林立地质量的可行性。方法基于168块固定样地的314个观测数据,提出了基准胸径确定的方法,即以胸径-年龄的逻辑斯蒂方程为基础,求其拐点纵坐标(即为基准胸径)。以理查兹生长方程分别拟合优势高-年龄、优势高-优势胸径的导向曲线,分别计算各样地的地位指数与立地形,并分析立地形与地位指数以及二者与林分生产力之间的关系。结果立地形与地位指数回归方程的决定系数R2为0.3627,RMSE为1.9930m,平均绝对误差MAE为1.5632m。地位指数、立地形与生产力的相关系数分别为0.6764和0.3203。采用等距划分的方法将计算所得的地位指数与立地形划分为8个等级,地位指数从1至8级各等级所占比例分别为0.64%、3.82%、12.74%、24.84%、32.48%、19.43%、5.10%、0.96%;立地形从1至8级各等级所占比例分别为0%、1.59%、9.24%、42.36%、44.90%、1.91%、0%、0%。结论对于落叶松人工林来说,立地形只能解释36.27%的地位指数变异;地位指数与生产力的相关性远大于立地形与生产力的相关性。对立地形与地位指数采用等距划分的方法进行立地质量等级划分,立地质量等级均呈现出中间多、两头少的趋势,但各等级的样地数量差异较大。总体来说,本研究中立地形不宜作为长白落叶松人工林立地质量评价的指标。

     

  • 图  1  长白落叶松林分优势高-年龄导向曲线

    Figure  1.  Guide curve of stand height-age for Larix olgensis plantation

    图  2  长白落叶松林分优势高-优势胸径导向曲线

    Figure  2.  Guide curve of dominant tree height-dominant DBH for Larix olgensis plantation

    图  3  地位指数(SF)与立地形(SI)的关系

    Figure  3.  Relationship between site index and site form

    图  4  地位指数与生产力关系

    Figure  4.  Relationship between site index and productivity

    图  5  立地形与生产力关系

    Figure  5.  Relationship between site form and productivity

    图  6  地位指数和立地形的立地质量等级分布

    Figure  6.  Distribution of site quality grade by site index and site form

    表  1  长白落叶松人工林样地基本因子统计

    Table  1.   Summary statistics for sample plots of larix olgensis plantation

    林分因子Stand factor 最小值Min. 最大值Max. 平均值Mean 标准差SD
    年龄Age/a 7.0 50.0 26.8 10.3
    平均胸径Average DBH/cm 5.7 26.1 12.1 3.8
    优势胸径Dominant DBH/cm 6.5 33.3 17.8 5.7
    海拔Altitude/m 170.0 1190.0 536.1 200.8
    坡度Slope/(°) 0.0 35.0 10.6 7.4
    腐殖质层厚度Humus thickness/cm 0.0 25.0 4.8 3.5
    土壤厚度Soil thickness/cm 15.0 70.0 42.1 10.2
    活立木株数/(株·hm-2)Number of alive trees/(tree·ha-1) 333 4033 1328 730
    活立木断面积/(m 2·hm-2)Basal area of alive trees/(m2·ha-1) 1.13 32.56 14.11 6.93
    平均树高Mean tree height/m 5.0 22.0 12.5 3.6
    优势树高Dominant tree height/m 6.7 29.5 17.3 4.2
    下载: 导出CSV

    表  2  长白落叶松人工林拟合参数值

    Table  2.   Fitting parameters of SI and SF equations for Larix olgensis plantation

    类别
    Class
    参数a
    Parameter a
    参数b
    Parameter b
    参数c
    Parameter c
    决定系数
    Coefficient of determination(R2)
    地位指数方程Equation of site index(SI) 30.418 1 0.017 9 0.555 0 0.594 7
    立地形方程Equation of site form(SF) 53.527 8 0.015 6 0.786 9 0.887 0
    下载: 导出CSV

    表  3  长白落叶松5种确定基准胸径的不同方法

    Table  3.   Five methods of calculating reference DBH for Larix olgensis plantation

    方法编号
    Method No.
    符号
    Symbol
    方法
    Method
    参考文献
    Reference
    表达式
    Expression
    结果
    Result
    1 D1 上层木生长史一般可达的平均胸径的一半
    Half of the maximum mean DBH of the overstorey trees
    [7] D1=Dmax/2 17
    2 D2 根据林木调查数据,出现频次较多的胸径值为基准胸径
    Reference DBH, the most frequently appeared DBH number in the forest survey data
    [8-9] D2=mode(D1, D2, …, Dn) 20
    3 D3 建立逻辑斯蒂树高-胸径模型, 拟合方程的二阶导数为0的胸径值
    D value, in Logistic H-D model, when the second derivative of the fitted equation is 0
    [23] D3=lnb/c 14
    4 D4 建立逻辑斯蒂胸径-年龄模型,基准年龄对应的胸径(T0=20)
    DBH, relative to the reference age in Logistic D-AGE model(T0=20)
    [24] D4=a/(1+be-bT0) 15
    5 D5 建立逻辑斯蒂胸径-年龄模型,以及胸径-年龄拟合方程的二阶导数为0的点所对应的胸径值
    D value, in Logistic D-AGE model, when the second derivative of the fitted equation is 0
    D5=a/2 14
    注:T0为基准年龄,Dmax为上层木最大胸径,abc为待估参数。Notes:T0 is reference age, Dmax is maximum mean DBH of the overstorey trees,a, b and c are parameters to be estimated.
    下载: 导出CSV
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  • 收稿日期:  2017-11-07
  • 修回日期:  2017-12-21
  • 刊出日期:  2018-06-01

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