雷州半岛不同桉树品系树冠生长预测模型研究

Study on the Growth Prediction Model For Crown Diameter in Different Eucalyptus Clones

应用阶跃函数模型,对雷州半岛4个不同桉树品系人工林的冠幅生长与树龄关系进行了回归分析与研究,并对不同品系桉树人工林冠幅生长的阶跃模型方程进行了比较分析。结果表明,阶跃函数模型在桉树林分树冠生长过程中的应用效果良好,巨尾桉无性系ECl的树冠生长遵循指数生长的阶跃模型,尾叶桉无性系U6的树冠生长遵循一元幂生长的阶跃模型,尾叶桉实生林与刚果12号桉无性系W5的树冠生长遵循严格苏玛克生长的阶跃模型。利用已建立的阶跃函数模型可以有效地预测不同桉树品系人工林树冠生长动态,为桉树人工林的合理经营提供科学依据。

Using unit step function, the regression model between crown diameter growth and age of 4 Eucalyptus clones in Leizhou peninsula were tested and analyzed. The optimum step function model for all kinds of 4 Eucalyptus clones are contrasted and analyzed at the same time. Results show that：the step function model does very well in industrial Eucalyptus stand crown growth. The crown diameter growth of Ecl clones follows step function model of exponential growth, while that of U6 clones follows step function model of monadic power growth, and Eucalyptus urophylla and W5 clones follows step function model of strict sttmake growth. With these step function models, the crown diameter growth of Eucalyptus clones can be predicted, and it also provided scientific basis for the reasonable management of Eucalyptus plantations.