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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