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利用林分密度指数(SDI)作为天然林的林分密度测度,来反映天然林区天然林分中林木之间的竞争水平,利用地位级指数(SCI)代替地位指数来反映天然林区林分立地质量。结合这2个因子以Schumacher生长曲线为基本模型形式建立了天然林全林分生长和收获模型,模型包括断面积生长预估模型、林分蓄积量预估模型、郁闭度预估模型和蓄积枯损率模型。从模型的拟合和检验结果来看,模型的效果良好。
Using the stand density index (SDI) as the measure of the stand density of natural forests to reflect the competition among the natural forest stands in natural forest areas, and using the rank index (SCI) instead of the status index to reflect the natural forest stand Site quality. Combined with these two factors, Schumacher growth curve was used as the basic model to establish the model of full stand growth and harvest of natural forest. The models include the model of area growth prediction, stand volume estimation, canopy closed prediction and accumulation Loss rate model. From the model fitting and test results, the model works well.