雷州尾叶桉树冠指标与抚育间伐关系的探讨

通过对雷州尾叶桉树冠有效受光面积、树冠比率、树冠投影面积进行调查研究,分别用树冠有效受光面积、树冠比率、投影面积与胸径建立一元幂函数回归方程进行研究与分析,结果表明树冠有效受光面积公式对指导培育中径材较好;树冠比率与树冠投影面积公式的回归效果基本一致,对指导培育小径材较为理想,并利用上述回归公式编制单株营养面积、公顷立木株数和公顷基面积表为尾叶桉人工林的抚育间伐设计与施工提供理论依据。

Study on the Relation of Tree Crown Indexes of E. urophylla and Thinning in Leizhou

Effective area of shining light on crown,crown ratio and projection area of crown of E.urophylla were studied in this paper.Three regression equations were built from three indexes and diameter at breast height(DBH).The results showed that the equation of effective area of shining light on crown and DBH had a positive effect on the breeding of the cultivation of middle-diameter plantation,the other equations were almost identical except for some differences between them.Tree number of stand and its base area per hectare offered a basis for E.urophylla plantation to thinning and afforestation.