林分平均胸径100倍圆法测定每公顷断面积的理论初探(之二)--误差分析与修正系数

通过对100Dg圆公式含义的分析,对影响林分断面积精度的2个主要因子:样地株数密度与林分平均胸径估测值进行了误差分析与探讨,提出了样地株数密度估计林分株数密度采用典型选样,林分平均胸径估测值采用目测法等相应解决办法。其中,当目测值有偏差时采用修正系数可使100Dg圆的可靠性进行了理论上的探讨。

Preliminary Theoretic Study on Section Area per Hectare Determined by the Method of 100 Times of Circles of Forest Stand Average Breast Diameter II--Error Analysis and Correction Coefficient

Based on the analysis of 100 Dg formula,the author explores the error analysis of evaluated figure of two major factors which influence stand section area accuracy namely plant number density in the sample plots and stand average breast diameter,furthermore forwards that the typical sample selection is adopted to evaluate the stand plant number by plant number density in the sample plots,and the evaluated value of stand average breast diameter by the method of range estimation,in which the correction coefficient is adopted to make a theoretical discussion on the 100 Dg circle when there is a error in the range estimated value.