关键词: 微波膨胀梗丝, 微波膨胀梗丝, 卷烟, 掺配均匀性, 偏差, 模型

Abstract: The growth model of height, diameter at breast height and volume of Cunninghamia lanceolata was established to provide reference for the study of the growth of Cunninghamia lanceolata in Hubei Province. The temporary sample plots of Cunninghamia lanceolata plantations in three regions of Hubei Province were investigated and the analytical trees were obtained. Based on the data of 283 analytical trees, dumb variable was introduced according to the regional characteristics, and the growth models of height, diameter at breast height and volume of C. lanceolata plantations were established respectively. The results showed that Richards equation with dummy variable fitted the height and DBH growth model best, Richards equation without dummy variable fitted the volume growth model better, the goodness of fit R2 of the model reached 0.8376, 0.7946 and 0.7532. The model was tested by independent samples, and the height and DBH models with dummy variable were tested. Independent sample tests showed that the prediction accuracy of height model, DBH model and volume model without dummy variables was above 97%. According to the growth curve fitted by the model, the fast growth period of height and DBH of C. lanceolata in Hubei Province was about 4-12 years, and the maximum growth rate was reached in 7 a, and the volume grew fastest before 15 a. The growth of height and DBH of C. lanceolata in southwestern Hubei was slightly higher than that in southeastern and northwestern Hubei. There was no significant difference between southeastern and northwestern Hubei.