| 关帝山华北落叶松林分直径分布规律研究 |
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| 引用本文： | 秦舟,张梦弢.关帝山华北落叶松林分直径分布规律研究[J].西北林学院学报,2021,36(1):208-214. |
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| 作者姓名： | 秦舟 张梦弢 |
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| 作者单位： | (山西农业大学 林学院，山西 太谷 030801) |
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| 基金项目： | 山西省应用基础研究项目青年科技研究基金:基于限定混合模型的华北落叶松林分直径结构分布研究(201801D221302)。 |
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| 摘 要： | 以山西关帝山自然保护区内的天然次生华北落叶松林分为对象，布设9块30 m×30 m样地，测量进入检尺径阶立木的直径，利用Weibull分布模型、负指数函数模型以及限定混合Weibull模型研究天然林分的直径分布规律，研讨剖析林分直径分布规律和结构模型。结果表明，除3号样地外，1~4号样地直径分布符合正态分布曲线，3参数Weibull分布拟合效果较好，均方根误差（Rmse）、平均偏差（Bias）以及卡方检验（χ2）值较小，而P值最大；3、5~7号样地直径分布以限定混合Weibull分布拟合效果较好，对应Rias、Rmse以及χ2值最小，对应P值最大；负指数分布拟合8、9号样地的直径分布效果较好，Rias、Rmse以及χ2值最小，对应P值也最大。本次研究总结分析直径对林分结构其他相关因子的影响，为庞泉沟自然保护区的林分经济价值、各项生态效益评估和调整该地区林分提供了理论依据。
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| 关 键 词： | 直径分布 华北落叶松林 Weibull分布 负指数分布 限定混合Weibull分布 |
Diameter Distribution of Larix gmelinii var.principis-rupprechtiii in Guandi Mountain |
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| QIN Zhou,ZHANG Meng-.Diameter Distribution of Larix gmelinii var.principis-rupprechtiii in Guandi Mountain[J].Journal of Northwest Forestry University,2021,36(1):208-214. |
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| Authors: | QIN Zhou ZHANG Meng- |
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| Institution: | （College of Forestry,Shanxi Agricultural University,Taigu 030801,Shanxi,China） |
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| Abstract: | The natural secondary forest of Larix gmelinii var.principis-rupprechtii occurring in Guandi Mountain Nature Reserve in Shanxi was taken as the research object.Nine sample plots each with a size of 30 m×30 m were set up.Diameters of the standing trees sias research object,was divided into the research objects,9 plots of 30 m×30 m samples were set up to measure the diameter of standing trees that met the diameter scales were measured.The Weibull distribution model,negative exponential function model and limited mixed Weibull model were used to study the diameter distribution laws of natural forests,and the diameter distribution laws and structural models of forest stands were discussed and analyzed.The results showed that except for No.3 sample plot,in the No.1-4 plots,the diameter distributions conformed to the normal distribution curve,and the 3-parameter Weibull distribution could be fitted well,values of Rias,Rmse,andχ^2 were smaller,while the corresponding P-value was the largest.Sample diameter distributions of No.3 and No.5-7 plots could be fitted by finite mixture model Weibull distribution,corresponding values of Rias,Rmse were the smallest,and the P-value was the largest.The diameter distribution of the No.8 and 9 plots were fitted for the negative exponential mode.The both values of Rias,Rmse,andχ^2 were the smallest,and the P-value was also the largest.This study summarizes and analyzes the influence of diameter on other related factors of forest sub-structure,and provides a theoretical basis for the assessment of forest sub-economic value and ecological benefits in Pangquangou Nature Reserve. |
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| Keywords: | diameter distribution Larix gmelinii var principis-rupprechtii forest Weibull distribution negative exponential distribution finite mixture Weibull distribution |
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