摘要
对凤县油松飞播林33块标准地调查结果进行了统计分析。结果表明,85%的标准地林分直径分布规律不符合标准正态分布,只有15%的标准地林分直径分布规律比较符合标准正态分布。88%标准地偏度数值大于0,为左偏,有76%标准地峰(峭)度数值小于0,其曲线与标准正态分布相比平缓。随着林分密度的增加,标准差和变异系数数值减少,偏度数值增加,峰度变化规律性不强;株数和断面积累计百分数曲线由缓和趋于剧烈,快速上升期跨越的径阶数量减少,林分集中在2、4、6径阶的林木株数较多。
Based on the data of 33 plots from aerial Pinus tabulaeformis forest in Fengxian County of Shaanxi,the results of statistics and analysis for those showed that the regularity diameter distribution within 85% plots did not accord with normal distribution,but one within 15% plots was normal distribution basically;for 88% plots skewness (SK)>0,to left side,and for 76% plots kurtosis < 0,the curve is more gradual (not steep) than that of normal distribution;with the increase of the stand density,standard ...
出处
《西北林学院学报》
CSCD
北大核心
2008年第5期182-187,共6页
Journal of Northwest Forestry University
基金
杨凌示范区农业推广项目(4130401)
关键词
油松飞播林
林分直径分布规律
正态分布
aerial Pinus tabulaeformis forest
regularity of diameter structure of stands
normal distribution
