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甘肃大野口青海云杉距离加权大小比竞争指数研究

陈永辉 张晓丽 刘会玲 王书涵

陈永辉, 张晓丽, 刘会玲, 王书涵. 甘肃大野口青海云杉距离加权大小比竞争指数研究[J]. 北京林业大学学报, 2017, 39(2): 40-48. doi: 10.13332/j.1000-1522.20160210
引用本文: 陈永辉, 张晓丽, 刘会玲, 王书涵. 甘肃大野口青海云杉距离加权大小比竞争指数研究[J]. 北京林业大学学报, 2017, 39(2): 40-48. doi: 10.13332/j.1000-1522.20160210
CHEN Yong-hui, ZHANG Xiao-li, LIU Hui-ling, WANG Shu-han. Distance-weighted size ratio competition index in the forest of Picea crassifolia in Dayekou, Gansu Province of northwestern China[J]. Journal of Beijing Forestry University, 2017, 39(2): 40-48. doi: 10.13332/j.1000-1522.20160210
Citation: CHEN Yong-hui, ZHANG Xiao-li, LIU Hui-ling, WANG Shu-han. Distance-weighted size ratio competition index in the forest of Picea crassifolia in Dayekou, Gansu Province of northwestern China[J]. Journal of Beijing Forestry University, 2017, 39(2): 40-48. doi: 10.13332/j.1000-1522.20160210

甘肃大野口青海云杉距离加权大小比竞争指数研究

doi: 10.13332/j.1000-1522.20160210
基金项目: 

国家重大科学仪器设备开发专项 2013YQ12034304

详细信息
    作者简介:

    陈永辉。主要研究方向:3s技术集成开发与应用。Email:739302469@qq.com  地址:100083 北京市海淀区清华东路35号北京林业大学林学院

    责任作者:

    张晓丽,教授,博士生导师。主要研究方向:定量遥感研究。Email:zhang-xl@263.net   地址:同上

  • 中图分类号: S718.5

Distance-weighted size ratio competition index in the forest of Picea crassifolia in Dayekou, Gansu Province of northwestern China

  • 摘要: 在研究对比距离加权的大小比竞争指数时,采用不同竞争木确定方法和参数可反映竞争压力效果差异,为其将来在林业生产实践尤其是林业遥感中的应用提供参考。本文以甘肃大野口青海云杉天然林为研究对象,以距离加权的大小比指数通用模型为基础,采用Pearson相关性和方差分离的方法,通过探究竞争对林木高径比(树高/胸径)生长的影响,对比分析了分别采用固定面积法、树冠重叠法、圆锥搜索法确定竞争木,以胸径、树高、冠幅分别为大小比参数,以固定半径、树高和、冠幅和分别为相对距离参数时,不同竞争指数反映竞争压力效果的差异。结果显示:1)竞争指数与高径比呈显著正相关(P < 0.01),并且相关性会随着下层林木从样本中的逐渐剔除而增强。2)针对研究区林分,圆锥搜索法是3种确定竞争木方法中效果相对最好的,其次为固定面积法,最差为树冠重叠法。3)除固定面积法外,选用树高和为相对距离参数的竞争指数与高径比的相关性大于选用冠幅和。4)以胸径比为大小比的竞争指数与高径比的相关性最大,其次为冠幅比,最小为树高比。5)排除与生长因子协同作用部分,以树高比为大小比的竞争指数对高径比变异的独立解释力最大(15.7%),其次为胸径比(7.3%),最小为冠幅比(3.6%)。综上表明,针对青海云杉天然林,距离加权的大小比竞争指数能够有效反映林木所受竞争压力情况,但竞争木确定方法和模型参数选用不同,其所反映的竞争效果也不同。3种竞争木的确定方法以圆锥搜索法为最佳,距离权重函数中以树高和为相对距离参数最好,而大小比参数选用树高相对更具生态学意义。

     

  • 图  1  固定标准地内林木空间分布图

    ○为树冠,□为研究区域。

    Figure  1.  Distribution pattern of individual trees in the plot

    ○ represents crown, □ represents study area.

    图  2  林分结构组成分布

    Figure  2.  Class distribution of stand structure

    图  3  圆锥搜索法示意图

    hi.对象木树高;β.开放角。hi, height of subject tree; β, opening angle.

    Figure  3.  A schematic diagram of vertical search cone method

    图  4  竞争和自然生长对高径比差异的解释量比较

    a、b分别表示竞争、自然生长的独立贡献,c代表两者协同作用, u为未解释量。下同。

    Figure  4.  Relative contributions of competition and natural growth in explaining the variation patterns of height-diameter ratio

    a and b represent independent effects of competition and natural growth, c represents the joint effects of both, and u represents unexplained effects. The same below.

    图  5  不同林层高度林木竞争指数与高径比相关性变化

    Figure  5.  Correlation changes between competition indices and height-diameter ratio at different height forest

    图  6  竞争与自然生长对高径比生长变化的相对影响

    Figure  6.  Relative importance of competition and natural growth in explaining the variation patterns of height-diameter ratio

    表  1  青海云杉林分基本概况

    Table  1.   Basic situation of Picea crassifolia stand

    郁闭度
    Canopy
    density
    密度/(株·hm-2)
    Density/
    (tree·ha-1)
    胸径DBH/cm 树高Tree height/m 冠幅Crown width/m
    最大
    Max.
    最小
    Min.
    平均
    Average
    最大
    Max.
    最小
    Min.
    平均
    Average
    最大
    Max.
    最小
    Min.
    平均
    Average
    0.78 1 457 50.50 3.00 16.70 23.78 1.90 10.61 9.05 0.50 3.43
    下载: 导出CSV

    表  2  竞争木确定方法及模型参数选用情况

    Table  2.   Methods of selecting competitive trees and parameter selection

    竞争木确定方法Methods
    for choosing competitive tree
    Rij dists CIDRi
    树冠重叠法
    Crown overlap method
    dj/di hj+hi C1
    dj/di cj+ci C2
    hj/hi hj+hi C3
    hj/hi cj+ci C4
    cj/ci hj+hi C5
    cj/ci cj+ci C6
    固定面积法
    Fixed area method
    dj/di c C7
    hj/hi c C8
    cj/ci c C9
    圆锥搜索法
    Vertical search cone method
    dj/di hj+hi C10
    dj/di cj+ci C11
    hj/hi hj+hi C12
    hj/hi cj+ci C13
    cj/ci hj+hi C14
    cj/ci cj+ci C15
    注:hj.竞争木树高;hi.对象木树高;dj.竞争木胸径;di.对象木胸径;cj.竞争木冠幅;ci.对象木冠幅;c .林分平均冠幅。Notes: hj, competitive tree height; hi, subject tree height; dj, competitive tree DBH; di, subject tree DBH; cj, competitive tree crown width; ci, subject tree crown width;c, average crown width of stand.
    下载: 导出CSV

    表  3  各竞争指数统计特征

    Table  3.   Statistics of individual tree competition index

    竞争木确定方法
    Methods for choosing competitive tree
    距离加权大小比指数
    CIDR i
    动态范围
    Range
    均值
    Average
    变异系数
    Variation coefficient
    树冠重叠法Crown overlap method C1 0~816.42 43.25 0.56
    C2 0~500.18 30.90 0.55
    C3 0~684.62 40.97 0.46
    C4 0~426.54 29.20 0.49
    C5 0~1 089.16 34.29 0.47
    C6 0~681.14 24.19 0.46
    固定面积法Fixed area method C7 0~418.08 30.26 0.64
    C8 0~364.54 29.10 0.54
    C9 0~573.36 24.26 0.57
    圆锥搜索法Vertical search cone method C10 0~968.88 114.75 0.72
    C11 0~594.20 78.35 0.71
    C12 0~877.62 104.91 0.62
    C13 0~523.10 71.20 0.62
    C14 0~1 328.44 73.07 0.69
    C15 0~807.32 48.83 0.62
    下载: 导出CSV

    表  4  不同林层高度竞争指数(树冠重叠法)与高径比相关系数

    Table  4.   Pearson correlations between competition indices (crown overlap method) and height-diameter ratio at different height forest

    林层高度
    Forest story height/m
    C1 C2 C3 C4 C5 C6
    > 2 0.169 ** 0.062 * -0.017 -0.100 ** 0.086 ** 0.003
    > 4 0.225 ** 0.127 ** 0.059 -0.039 0.092 ** 0.019
    > 6 0.555 ** 0.366 ** 0.232 ** 0.033 0.339 ** 0.133 **
    > 8 0.608 ** 0.417 ** 0.296 ** 0.062 0.421 ** 0.187 **
    > 10 0.628 ** 0.411 ** 0.353 ** 0.086 0.472 ** 0.210 **
    > 12 0.631 ** 0.427 ** 0.360 ** 0.115 * 0.476 ** 0.232 **
    > 14 0.623 ** 0.411 ** 0.346 ** 0.094 0.445 ** 0.198 **
    注:*表示显著相关(P<0.05),**表示极显著相关(P<0.01)。下同。Notes: * means significant correlation (P<0.05), ** means extremely significant correlation (P<0.01). The same below.
    下载: 导出CSV

    表  5  不同林层高度竞争指数(固定面积法)与高径比相关系数

    Table  5.   Pearson correlations between competition indices (fixed radius method) and height-diameter ratio at different height forest

    林层高度Forest story height/m C7 C8 C9
    > 2 0.197 ** 0.024 0.139 **
    > 4 0.286 ** 0.126 ** 0.160 **
    > 6 0.580 ** 0.326 ** 0.413 **
    > 8 0.684 ** 0.425 ** 0.514 **
    > 10 0.687 ** 0.479 ** 0.545 **
    > 12 0.687 ** 0.485 ** 0.551 **
    > 14 0.680 ** 0.483 ** 0.531 **
    下载: 导出CSV

    表  6  不同林层高度竞争指数(圆锥搜索法)与高径比相关系数

    Table  6.   Pearson correlations between competition indices (search cone method) and height-diameter ratio at different height forest

    林层高度
    Forest story height/m
    C10 C11 C12 C13 C14 C15
    > 2 0.247 ** 0.154 ** 0.047 -0.034 0.211 ** 0.131 **
    > 4 0.350 ** 0.263 ** 0.168 ** 0.086 * 0.244 ** 0.183 **
    > 6 0.559 ** 0.458 ** 0.340 ** 0.231 ** 0.477 ** 0.403 **
    > 8 0.685 ** 0.584 ** 0.465 ** 0.332 ** 0.591 ** 0.524 **
    > 10 0.719 ** 0.635 ** 0.552 ** 0.415 ** 0.656 ** 0.596 **
    > 12 0.731 ** 0.665 ** 0.561 ** 0.458 ** 0.663 ** 0.615 **
    > 14 0.740 ** 0.690 ** 0.578 ** 0.489 ** 0.663 ** 0.620 **
    下载: 导出CSV

    表  7  回归分析的决定系数

    Table  7.   Decision coefficient of regression analysis

    回归模型Regression model R2/% P
                dh-C10 46.8 < 0.001
                dh-DBH 47.4 < 0.001
                dh-DBH+C10 54.7 < 0.001
                dh-C12 21.6 < 0.001
                dh-H 6.4 < 0.001
                dh-H+C12 22.2 < 0.001
                dh-C14 35.0 < 0.001
                dh-Cr 38.9 < 0.001
                dh-Cr+C14 42.5 < 0.001
    注:dh.高径比;H.树高;Cr.冠幅。图 6同此。Notes: dh, height-diameter ratio; H, tree height; Cr, crown width. The same as Fig. 6.
    下载: 导出CSV
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    HUI G Y, HU Y B, ZHAO Z H, et al. A forest competition index based on intersection angle[J]. Scientia Silvae Sinicae, 2013, 49(6):68-73. http://d.old.wanfangdata.com.cn/Periodical/lykx201306010
    [30] LONGUETAUD F, PIBOULE A, WERNSDORFER H, et al. Crown plasticity reduces inter-tree competition in a mixed broadleaved forest[J]. European Journal of Forest Research, 2013, 132(4):621-634. doi: 10.1007/s10342-013-0699-9
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出版历程
  • 收稿日期:  2016-06-24
  • 修回日期:  2016-12-06
  • 刊出日期:  2017-02-01

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