DBH Class Structure of Quercus variabilis Natural Secondary Forest in Funiu Mountain
[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 0.952 7、0.959 4 and 0.964 1.(3)The diameter distribution of natural secondary forests of Quercus variabilis were better fitted by negative exponential function,whose fitting accuracy were separately 0.952 7、0.959 4 and 0.964 1 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 1 000 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.
Funiu mountainQuercus variabilisnatural secondary forestANNdiameter class
万方数据
维普
