长白落叶松直径分布收获模型的研究

该文将长白落叶松林地按地位指数划分为3个地位等级,分别地位等级建立了以三参数Weibull分布为基础的直径分布收获模型。该模型系统包括两大部分。第1部分建立了林分回归模型,其中主要包括林分因子预测模型,株数预测和断面积生长模型等;第2部分建立了参数回收模型,即采用林分因子的预估值来回收Weibull分布的参数,保证了收获模型与林分回归模型的一致性。该模型不仅能输出林分的总体收获量(蓄积量,出材量),而且能输出各径阶的收获量。误差检验结果表明该模型精度较高。

A Study on the Diameter Distribution Yield Model of Changbai Larch

In this study, Changbai larch forest land was divided into three site classes each with an index. Based on the three Weibull distribution parameters, a diameter distribution yield model was developed to predict the yield of each site class. The model system involves two phases. In the first phase, a stand-level model was developed.This mainly included the stand attributes predict model, the stems predict model and the basal area growth model,et al. During the second phase the parameter recovery model of Weibull distribution was derived from the stand attributes predicted in the first phase, while ensuring compatibility between the stand-level model and the parameter recovery model. From the model, it is possible to calculate the whole stand yield (stand volume, merchantable volume) as well as the yield of each diameter class of the stand. Based on the error test, the model was shown to be highly accurate.