关帝山天然次生针叶林林隙大小模型研究

Study of the gap size model in a secondary coniferous forest of Guandi Mountain

对关帝山3种天然林(华北落叶松、云杉、油松林)林隙大小进行实地调查,通过对实测数据的分析与研究可得:3种林分的林隙(冠层林隙CG、扩展林隙EG)大小都有差异,其中各种林分CG的大小主要集中在0～100m2之间,以云杉林最大,其次是油松林,华北落叶松林最小。EG的大小主要集中在50～100m2之间,以油松林最大,其次是云杉林,华北落叶松最小;对林分CG及EG大小分布进行了拟合,结果发现正态分布模型、对数正态分布模型及Weibull分布模型都可以对3种林分CG、EG林隙大小进行拟合;最后通过复相关系数对3种分布拟合模型进行了优度比较,结果为对数正态分布的拟合精度更高。

With regard to proceeding on-site investigation on gap size of the three species of natural forests （Larix principis-rupprechtii,Picea asperata,Pinus tabulaeformis） in Guandi Mountain,as well as obtained from analyzing and researching the measured data：Stands of the three forest species are discrepancy in terms of canopy gap （CG） and expanded gap （EG） size,of which CG size mainly concentrated in range of 0—100 m2,in which the largest one was P.asperata,followed by P.tabulaeformis forest＇s,while Larix principis-rupprechtii＇s was the smallest;EG size mainly concentrated in range of 50—100 m2,in which the largest one was P.tabulaeformis forest,followed by Picea asperata,and L.principis-rupprechtii＇s was the smallest.Fitting both CG and EG size and the result was of normal distribution and both logarithmic normal distribution and Weibull distribution could be fitting CG and EG size for the forest stands of the three species,whereas for fitting precision,Logarithmic normal distribution was considered the best fitting model by comparing the multiple correlation coefficient.