| 摘要: |
| 【目的】选择能够正确拟合经过采伐后的长白山云冷杉针阔混交林直径结构分布的模型。【方法】以长白山12块经过2～3次采伐的云冷杉过伐林固定样地数据为依据，分别运用负指数、三参数Weibull、限定混合Weibull模型拟合云冷杉混交林的直径分布。【结果】12块样地密度为535～1 035株/hm2，平均胸径变化不大，在20.1～23.9 cm；所有样地直径分布偏度为正。除1号、7号样地的直径结构用负指数模型效果较好，2号、4号样地用三参数Weibull模型拟合效果较好外，其余样地均适合用限定混合Weibull模型拟合。【结论】3种分布模型中，负指数模型拟合近似“反J”型曲线时效果较好，而限定混合Weibull模型在拟合不规则直径分布时效果较好。 |
| 关键词: 云冷杉混交林 直径分布 负指数模型 Weibull模型 限定混合Weibull模型 |
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| 基金项目:引进国际先进林业科学技术“948”项目（2013-4-66） |
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| Diameter structural distribution of spruce-fir mixed forest in Changbai Mountain |
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ZHANG Meng-tao,KANG Xin-gang,GUO Wei-wei,et al
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| Abstract: |
| 【Objective】This study aimed to choose models for simulating diameter structure of harvested spruce-fir mixed forest in Changbai Mountain.【Method】Based on analysis of 12 spruce-fir permanent plots in over-cutting forest that had been cut two or three times,negative exponential model,three parameters Weibull model and finite mixed Weibull model were used for fitting diameter distributions of spruce fir mixed forest.【Result】The density of tree number was 535－1 035 trees/hm2,and the mean DBH was 20.1－23.9 cm.The skewness was positive in all plots.The negative exponential model was suitable for diameter distribution of plots 1 and 7,three parameters Weibull model was suitable for plots 2 and 4,while finite mixed Weibull model was good for the rest.【Conclusion】The inverse J shaped curves can be better fitted by negative exponential model,while the irregular distributions can be fitted better by finite mixed Weibull model. |
| Key words: spruce-fir mixed stand diameter distribution negative exponential model three parameters Weibull model finite mixed Weibull model |
