文献类型：期刊文献

中文题名：杉木人工林林分直径结构动态变化及其密度效应的研究

英文题名：Studies on Dynamics of Diameter Structure of Chinese Fir Plantations and Affection of Density on It

作者：段爱国[1] 张建国[1] 童书振[1] 保尔江[2] 何彩云[1]

第一作者：段爱国

机构：[1]中国林业科学研究院林业研究所;[2]新疆阿尔泰地区林科所

年份：2004

卷号：17

期号：2

起止页码：178-184

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：国家"十五"攻关项目"南方主要针叶用材林树种新品种选育及培育技术

语种：中文

中文关键词：杉木;人工林;林分直径结构;动态变化;密度效应

外文关键词：Chinese fir plantation;diameter structure;dynamics;density;indices

分类号：S791.27

摘要：利用杉木人工林固定样地的观测数据,采用偏度、峰度、直径变动系数、径阶株数分布及累积直径频率等指标对杉木人工林林分直径结构动态变化规律及其密度效应进行了探讨,结果表明:(1)在6～20a内,偏度先为负值,后由负值逐渐趋向于正值,表现为先右偏后左偏,偏度绝对值先变小后变大,任何时期,密度高的林分其偏度值越大,由负向正变化的时间越早;(2)峰度随年龄的变化规律不明显,相对于高密度的林分,低密度林分的峰度值更大,且不论低密度还是高密度,峰度值都趋向于0;(3)直径变动系数随着林分年龄的增长总体上呈微弱增加的趋势,而且前期逐渐减小,后期(郁闭后)缓慢增大,高密度林分的直径变动系数较低密度的大,也更早地呈增大趋势;(4)对于任一相同的株数累积频率范围,密度越高的林分所对应的直径区域中值越小;(5)林分径阶株数分布直观地说明了上述结论。
Using data from permanent sample plots, this paper studied the dynamics of diameter structure of Chinese fir plantations and affection of density on it, some criterions was adopted such as skewness, kurtosis, variance coefficient, cumulative diameter distribution curves and frequency distribution and so on. The results show:1.In the age range of 6～20,the value of skew changes from negative to positive, the absolute value of skew first gets small,then change to big, at any time, high density stands have the bigger skew, the higher the density of stands is, the earlier the skew varies from negtive to positive;2.The variance law of kurtosis with age is not obvious,kurtosis of stands with low density is bigger than stands with high density, and the value of kurtosis,both of them,tends to 0 at last.3.The diameter variance coefficient shows weakly increasing trendency with age on the whole, and declines in earlier stage,then increases after canopy closure. non-evenness quality of high density stands is relatively big,and the bigger the density is, the earlier the variance coefficient of diameter shows increasing trendency.4.At any range of cumulative frequency distribution,the more smaller the density is, the bigger the middle value of diameter class is, which benefits the formatioin of middle and big wood.5.The size-class distribution testifies these conclusions.