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本表是采用生长锥钻取样条,依据立木胸径变化而编制的一元材积生长量(率)表。具有不砍伐树木,简便易测,精度较高的优点。制表样木取自寺大隆、西水、隆畅河、大黄山、西营河五个林场,于苔藓云杉林分中机械抽取样木共847株,用生长锥钻取胸径处10个年轮宽度和皮厚,然后统计整理,求算各径级带皮平均直径,去皮平均直径、10个年轮宽度的平均值,并以此原始数据,计算各径阶n/2年前的直径和生长量,配合带皮直径和带皮直径生长量的回归方程,编制材积生长量(率)表。各径阶n/2年前的带皮直径(D(n/2))和带皮直径生长量(Z_D)的回归方程式为: D_(n/2)=0.4682928+1.0262529d_(n/2) Z_D=1.0262529Zd 苔藓云杉林分的带皮直径(D)和带皮直径生长量(Z_D)的相关回归方程为: Z_D=0.127254097+0.0078743948D-0.00014085167D~2。根据上式求算各径阶的带皮直径生长理论值,并用材积差法推算出材积生长率。本表由于取样株数较多,精度较高,可在生产中推广使用。
This table is the use of growth cone drill spline, according to changes in the DBH diameter and prepared by the volume growth of the volume (rate) table. With not cutting trees, easy to measure, the advantages of higher accuracy. Form of wood samples taken from the temple Dalong, Xishui, Longchang River, Huangshan, Xying River five forest, in the moss spruce stand mechanical sampling of 847 wood samples, growing cone drilled diameter at 10 An annual ring width and skin thickness, and then statistical finishing, calculate the diameter of the average diameter of the skin with a diameter, the average diameter of peeled, the average of 10 ring width, and the original data, calculate each diameter n / 2 years Before the diameter and growth, with the skin diameter and skin diameter growth of the regression equation, volume growth volume (rate) table. The regression equation of the skin diameter (D (n / 2)) and the skin diameter growth (Z_D) of each diameter step n / 2 years ago was: D n / 2 = 0.4682928 + 1.0262529d_ (n / 2) Z_D = 1.0262529Zd moss spruce stands of skin diameter (D) and skin diameter growth (Z_D) of the correlation equation is: Z_D = 0.127254097 + 0.0078743948D-0.00014085167D ~ 2. According to the above formula, the theoretical value of the skin diameter growth of each diameter step is calculated, and the volume growth rate is deduced by the volume difference method. This table due to the sampling number of more high precision, can be used in the promotion of production.