根据南方七省(区)867块杉木实生林标准地原始资料,按不同地位级分别编制了杉木林密度管理图。 各测树因子间相互关系的数学模型:林龄与平均树高关系式为;林龄、密度和平均胸径的关系式为 图象采用直角座标系,以林分平均高、年龄作纵座标,每亩株数(密度)作横座标。基本线为等胸径线和等蓄积量线。参考线为最大密度线和冠幅线。 本图可为杉木林抚育间伐、作业类型设计、杉木生长和产量的预测以及杉木林资源清查提供参考依据。适用范围,年龄5—40年;密度50—500株/亩。 According to the original data of 867 fir plantation forests in the seven provinces (autonomous regions) of the South China, the density management maps of Chinese fir plantations were compiled according to the different status levels. Mathematical model of the relationship between each tree-calculating factors: age and average tree height for the relationship; age, density and average breast diameter of the relationship between the image using the Cartesian coordinate system, with high average forest age as the longitudinal Standard, per acre strains (density) for the abscissa. The basic line for such as the diameter of the thoracic and other volume accumulation line. The reference line is the maximum density line and the crown line. This map can provide the reference for fir thinning, crop type design, Chinese fir growth and yield prediction, and Chinese fir forest inventory. The scope of application, age 5 - 40 years; density 50-500 plants / mu.