大围山杉木人工林不同海拔直径分布研究  

Diameter Distribution of Chinese Fir in Different Altitudes in Dawei Mountain

作　　者：周国强[1] 陈彩虹[1] 楚春晖[1] 杜缘缘 

机构地区：[1]中南林业科技大学,湖南长沙410000

出　　处：《西北林学院学报》2017年第1期86-91,共6页Journal of Northwest Forestry University

基　　金：国家林业行业公益性项目"南方集体林区次生抚育间伐与高效利用技术研究"(201004032);湖南省"十二五"重点学科-森林经理(034-0014)

摘　　要：以大围山杉木人工林林分为研究对象,选择Weibull分布、Gamma分布、Lognormal分布、正态分布和Logistic分布5种分布函数,对海拔400、600、800、1 000、1 200m和1 400m的6个海拔段的24个样地的直径结构采用FORSTAT2.1统计软件进行了拟合研究。结果表明:1)大围山杉木人工林林分的24块样地直径分布主要在12~22cm径阶内,海拔400~1 000m之间9块平均年龄相同(19a)的样地林分的平均胸径大小和海拔的上升呈负相关;2)各样地林分的偏度和峰度基本不受海拔的影响;3)样地直径分布的拟合效果随海拔升高略有提升,且正态分布函数曲线是描述大围山杉木人工林直径分布规律的最佳拟合曲线,但同龄人工生态公益林林分结构稳定性差,建议对其进行适当混交调整以增强林分的生态稳定性。To understand the diameter distribution of Chinese Fir in different altitudes in Dawei Mountain, 24 sampling plots were established in the altitudes of 400,600,800,1 000,1 200, and 1 400 m, respectively. Five distribution functions, such as Weibull, Gamma, Lognormal, normal, and Logistic distribution were adopted. Software FORSTAT2. 1 was used to conduct simulation. The results showed that 1） within 24 plots established,the diameter distribution ranged mainly in 12-22 cm class. In 9 plots which were located at the altitudes of 400 to 1 000 m and had the same age,i, e. ,19 a,the average DBH was negatively correlated with altitude. 2） The skewness and kurtosis of each plot were substantially unaffected by altitude. 3） The fitting effect of diameter distribution was slightly improved with the increase of altitude, and the normal distribution curve was the best to describe the diameter distribution. However,the structural stability of artificial ecological forest with the same age was poor,therefore it was proposed that the stand might be adjusted by mixing for enhancing the ecological stability.

关 键 词：杉木人工林 直径分布 海拔 分布函数 

分 类 号：S791.27[农业科学—林木遗传育种]