角规测树生长理论方法的研究

A Method for Estimating Stand Growth With Survivor on Horizontal Points Sample

系统地提出了复测角规固定样点计算林分材积和断面积生长量新的理论和方法体系 ,利用样地保留木的胸高断面积生长率 ,实现对林分生长量的估计。在此基础上应用七坡林场前 4期固定角规样地样木数据对该理论方法进行验证和计算。结果表明 :该方法体系不仅完善了传统方法 ,而且克服了传统方法中测定林分断面积、蓄积零增长及跳跃等现象 ;同时证明了固定保留木胸径生长反映角规样点断面积生长的理论式是无偏的。该方法与以角规张角变化或变角规系数估计林分断面积生长在理论上具有一致性 。

A method is presented for estimating the growth of basal area and volume with growth rate on remeasured horizontal point sampling .The computed results with four -time-data on remeasured point samples of Qipo forest center in Guangxi indicate that the new estimator may be more efficient than the traditional method .Theoretical equation identifies that the new estimator based on the growth of the survivors is unbiased and compatible with the variable basal area factor method .This paper is useful for forming a successive monitor system on remeasured horizontal point sampling.