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杉木人工林经营的计算机模型——CHIFIR,是在杉木生长过程表的基础上,考虑不同整地、抚育方法和间伐对杉木生长的影响而建立的,该模型能对杉木生长进行预测和经济分析。根据树冠影响系数(I)对直径生长的影响,考虑了树冠对光的竞争,建立了树冠影响系数与重叠度关系的回归方程。用71个样地的调查资料对模型进行F检验和U检验,模型的预测精度比较好。该模型运用于杉木分布的中带,它可在生产中试用,并可用于杉木经营方式最优化组合的理论计算。
CIFIR, a computerized model of Cunninghamia lanceolata plantation management, was established on the basis of the CIFS table, taking into account the effects of different site preparation, tending methods and thinning on the growth of Cunninghamia lanceolata. The model can predict and economically analyze Cunninghamia lanceolata growth. According to the effect of crown influence coefficient (I) on diameter growth, the competition of crown with light was considered, and the regression equation of the relationship between crown influence coefficient and overlap degree was established. The F-test and U-test of the model were conducted with the survey data of 71 plots, and the prediction accuracy of the model was better. The model is applied to the middle zone of fir distribution. It can be used in production and can be used for the theoretical calculation of the optimal combination of Chinese fir management modes.