| 摘要: |
| 【目的】研究黄龙山林区松栎混交林的树种组成及其胸径、树高分布特点，探究主要树种的空间分布格局及其关联性，为相关林区的可持续经营提供参考。【方法】2013-08，在陕西延安黄龙山林区选取典型的松栎混交林建立100 m×100 m的标准地，调查标准地内树木的坐标、树高、胸径等因子，划分径级和树高级，计算重要值；应用L(r)函数分析该林分主要树种在不同尺度下的分布格局，应用L12(r)函数分析不同树种在空间上的关联性；最后利用方差比率法计算总体联结系数，以此分析标准地内主要树种的总体关联性。【结果】标准地内胸径大于1 cm的树种有21种，物种丰富，树木密度较大；重要值位于前4位的油松、辽东栎、白桦和茶条槭为主要树种；林分胸径分布为倒“J”形曲线，树高分布呈近似正态分布曲线；油松、辽东栎和白桦在0～50 m尺度上呈集群分布，茶条槭在31～50 m尺度上有随机分布的趋势；油松与辽东栎、油松与白桦、辽东栎与白桦在0～50 m研究尺度上为不显著的正相关，茶条槭与其他主要树种在大部分研究尺度上呈现出不显著的负相关；研究区内主要树种的总体联结系数为1.01，表明该林区树种总体上表现为弱的正相关。【结论】在保持林分结构稳定的基础上，在黄龙山林区松栎混交林内可采取一些抚育措施，使森林更好地发挥其生态作用。 |
| 关键词: 黄龙山 松栎混交林 空间分布格局 点格局分析 种间关联性 |
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| 基金项目:国家自然科学基金项目“黄土高原水土保持林可持续经营基础研究”(31170587) |
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| Spatial distribution pattern and association of main tree species in mingled forest of Pinus tabuliformis+Quercus liaotungensis in Huanglong Mountain |
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TAN Duo-duo,LI Wei-zhong,WANG Qing,et al
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| Abstract: |
| 【Objective】Composition,diameter and height distribution characteristics of main species in mingled forest of Pinus tabuliformis+Quercus liaotungensis were investigated and the spatial distribution pattern and association were analyzed to provide reference for the sustainable management of related forests.【Method】In August 2013,a typical Pinus tabuliformis+Quercus liaotungensis sample plot（100 m×100 m) was selected in Huanglong Mountain,Yan’an,Shaanxi.The coordinates,height,diameter at breast height and other factors of trees were measured,diameter and height classes were classified and the important values were computed.L12(r) function proposed by Lotwich and Silverman was used to analyze the spatial associations between tree species and the overall correlation coefficient was calculated to study the overall relevance in the sample plot using variance ratio method.【Result】There were 21 tree species with diameter at breast height (DBH) of greater than 1 cm,indicating abundant species and a high tree density.P.tabuliformis,Q.liaotungensis,Betula platyphylla and Acer ginnala were classified as the main tree species with top 4 important values. Tree diameter distributed as inverse “J” curve,while the tree height distributed approximately as normal curve.P.tabuliformis,Q.liaotungensis and B.platyphylla all presented as cluster distribution at the scale of 0-50 m,while A.ginnala was randomly distributed at the scale of 31-50 m.P.tabuliformis and Q.liaotungensis,P.tabuliformis and B.platyphylla,and Q.liaotungensis and B.platyphylla had insignificant positive correlation at the scale of 0-50 m while A.ginnala showed insignificant negative associations with others at most scales.The overall correlation coefficient was 1.01,indicating that the tree species presented an overall weak positive association.【Conclusion】On the basis of keeping a stable stand structure,some management practices can be taken to make a better use of its ecological function. |
| Key words: Huanglong Mountain Pinus tabuliformis+Quercus liaotungensis forest spatial distribution pattern point pattern analysis interspecific association |
