Logistic模型在桉树生长过程估计中的应用

The Application of Logistic Model on Growth Process Estimation of Eucalyptus

以Logistic累计分布曲线方程为模型,从Logistic模型的生物学意义出发,对桉树人工林的现实最大生产潜力进行了研究,以探求最大生产潜力的求算方法,确定最佳生产力的时期。结果表明:在雷州半岛Ⅰ类立地类型上培育的短周期桉树人工林在现有的经营技术条件下已获得较佳的生产力水平,现实林分的蓄积量与最大生产潜力之间的差距未超过15%,最佳生产力时期在造林后3年左右出现。

The potential productivity was studied by Lieth,Miami and Thomthwaite model.The potential productivity depended on the climate.Based on the Logistic accumulating distribution model,the actual maximum potential productivity of the planting Eucalyptus stand was studied.The ways for getting maximum productivity value,the optimal period of productivity were discussed.Results show that:Short rotation Eucalyptus plantation stands cultivated in site type Ⅰ have reached better productivity level,the present managerial condition,and the difference between the actual growing stock and the maximum potential are no more than 15%.The best time for productivity is in about 3 years after being planted.