以下为句子列表：
英文: According to the crown growth characteristics in industrial Eucalyptus stand of short rotation, the unit step function model was put forward for the process with changing point of short rotation Eucalyptus clones U6 based on the survey practical stands.
中文: 摘要针对短轮伐期桉树人工林林分冠幅生长的特点，在现实林分调查的基础上，模拟提出了适合有变点的短轮伐期桉树U6无性系林分冠幅生长阶跃函数模型。
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英文: The analyzable conclusions of the regression model between crown diameter and age show that the utility of unit step function model in the crown growth process with the changing point is better than the usual regression methods, and the unit step function
中文: 对树冠与林龄的回归分析结果表明：阶跃函数模型在具有变点的桉树林分树冠生长过程中的应用效果优于一般回归拟合模型，可较好地解决分段拟合模型在变点上的不连续问题。
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