伏牛山区栓皮栎天然次生林径级结构模型研究  

DBH Class Structure of Quercus variabilis Natural Secondary Forest in Funiu Mountain

作　　者：陈晨 刘光武 陈德成 CHEN Chen;LIU Guangwu;CHEN Decheng(Henan Forestry Vocational College,Henan Luoyang 471002)

机构地区：[1]河南林业职业学院,河南洛阳471002

出　　处：《林业科技》2024年第5期6-10,共5页Forestry Science & Technology

基　　金：栎类次生林质量精准提升技术研究(YLK202201);河南林业职业学院校内科研项目(YLYK2203)。

摘　　要：[目的]以伏牛山区栓皮栎天然次生林为研究对象,探索其径级结构变化规律,建立了神经网络径级分布模型,为伏牛山区栓皮栎天然次生林合理经营提供理论基础。[方法]采用人工神经网络建模技术和数学函数法建立伏牛山区栓皮栎天然次生林径级分布模型,[结果](1)随着坡位变换伏牛山区栓皮栎天然次生林径级分布类型不同,上坡为反J形分布,中坡为正态分布,下坡为单峰左偏分布。(2)建立了不同坡位的神经网络径级分布模型,拟合精度分别为0.9979、0.9943、0.9959。(3)负指数函数能较好地拟合栓皮栎天然次生林径级分布,不同坡位拟合精度分别为0.9527、0.9594、0.9641。[结论]林分生长具有非线性和复杂性,而人工神经网络具有拟合任意非线性的能力,并且不受树种、立地条件、气候等因素影响。[Objective]In this study,the DBH class structure of Quercus variabilis natural secondary forest in Funiu mountainous were explored,and the DBH class distribution model based on ANN in order to provide theoretical basis for reasonable management of Quercus variabilis natural secondary forest in Funiu mountainous.[Method]The diameter distribution model in the study area were established by the application of ANN and mathematical function.[Result](1)The types of diameter distribution Quercus variabilis natural secondary forest in the Funiu area were different as the slope changed,the diameter distribution of uphill was in a reverse J-shape,the middle slope was normally distributed,downhill was single peak left deviation.(2)The diameter distribution model of different slope position were established based on ANN,whose fitting precision respectively reached 0.9527、0.9594 and 0.9641.(3)The diameter distribution of natural secondary forests of Quercus variabilis were better fitted by negative exponential function,whose fitting accuracy were separately 0.9527、0.9594 and 0.9641 in different slope position.[Conclusion]Forest growth has nonlinearity and complexity,while ANN has the ability to fit any nonlinearity and is not affected by factors such as tree species,site conditions and climate,etc.In the Funiu Mountain,Quercus variabilis is a constructive species below an altitude of 1000 m,whose carbon density increases with increasing altitude.The carbon density on sunny slopes is higher than that on shaded slopes due to the factors such as site environment and tree species characteristics.

关 键 词：伏牛山区 栓皮栎 天然次生林 神经网络 径级 

分 类 号：S757[农业科学—森林经理学]