昌化江流域天然林直径结构研究  

Research on diameter structure of natural forest in Changhua River Basin

作　　者：李俊[1] 佘济云[1] 胡焕香[1] 沈金明[1] 毛旭鹏[1] 

机构地区：[1]中南林业科技大学,湖南长沙410004

出　　处：《中南林业科技大学学报》2012年第3期37-43,共7页Journal of Central South University of Forestry & Technology

基　　金：海南省林业局重点科研项目(LK20118478);森林经理学湖南省"十一五"重点学科资助项目(034-0014)

摘　　要：为了探明昌化江流域天然林结构分布规律,合理调整林分结构,在对海南省昌化江流域典型样地共20块调查基础上,综合考虑不同林分类型和不同地理位置,利用直方图法、威布尔分布函数(Weibull)和伽玛分布函数(Gamma),结合卡方(x2)检验,对昌化江流域天然林直径结构进行分析及拟合。结果表明:昌化江流域天然林直径分布形状均呈现倒"J"形,形状参数具体排序为:源头(0.94)>硬阔混交(0.93)>全流域(0.90)>阔叶混交(0.89)>上游(0.85),径阶范围跨度大(6～74 cm),基本以小径阶为主(6～18cm),小径阶累计百分比都在70%以上;Weibull分布函数与Gamma分布函数对天然林的拟合效果相近,无显著差异;从不同林分类型及不同地理位置划分看,阔叶混交林的径阶波动较硬阔混交林大,源头地区天然林的径阶波动较上游地区天然林大。In order to study the distribution structure of natural forest of Changhua River Basin and adjust stand structure reasonably,based on the survey aiming to the typical sample totally 20 in Hainan Province Changhua River Basin,comprehensive consideration of the different forest stands and geographical location,the natural forest diameter structure of Changhua River Basin was analyzed and fitted by using histogram,Weibull distribution function and Gamma distribution function,combining with x2 checking method.The results show that the tree diameter distribution form of the natural forest of distribution shape in Changhua River Basin presented a reverse J-form,the concrete scheduling of shape parameters were as followings： source（0.94）hardwood mixed forest（0.93）〉the whole basin（0.90）〉broadleaved mixed forest（0.89）〉upstream〉（0.85）;The span of diameter class ranked 6～74 cm,which mainly were small diameter class（6～18 cm）,the accumulating percentage all were above 70%.The fitting effects of the Weibull function and the Gamma function to the natural forest was similar,without remarkable difference.Viewed from the division of different forest stand type and the different geographical location,were as followings： the diameter class fluctuation of the broadleaved mixed forest was larger than that of the hardwood mixed forest,the diameter class fluctuation of the natural forest in the headstream area＇s was larger than that of the natural forest in the upstream area.

关 键 词：天然林 直径结构 Weibull分布函数 Gamma分布函数 

分 类 号：S757.1[农业科学—森林经理学] TP18[农业科学—林学]