长白山云冷杉混交林直径结构分布研究  

Diameter structural distribution of spruce-fir mixed forest in Changbai Mountain

作　　者：张梦弢[1] 亢新刚[1] 郭韦韦[1] 孟京辉[1] 杨英军[2] 

机构地区：[1]北京林业大学,省部共建森林培育与保护教育部重点实验室,北京100083 [2]汪清林业局,吉林汪清133200

出　　处：《西北农林科技大学学报（自然科学版）》2015年第9期65-72,共8页Journal of Northwest A&F University(Natural Science Edition)

基　　金：引进国际先进林业科学技术“948”项目(2013-4-66)

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535～1035株／hm^2，平均胸径变化不大，在20．1～23．9cm；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weihull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。[Objective] This study aimed to choose models for simulating diameter structure of harves- ted 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 parame- ters 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/hm^2,and the mean DBH was 20. 1--23.9 cm. The skewness was positive in all plots. The negative exponential model was suitable for di- ameter 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.

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 

分 类 号：S711[农业科学—林学]