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果树的树冠结构并非众多弧立枝条的组成,而是以形态和生理上具有相对独立性的许多枝群为单位的单位枝所组成。单位枝按其在树冠上的不同功能可分为延长单位枝、结果单位枝、更新单位技。以其生长势的强弱可分为强、中、弱三种单位枝。因单位枝在果树树冠上具有形态和生理上相对独立性,故在研究树冠结构、树冠发育的理论和在修剪、疏花、疏果等生产实践,以及研究的取样上均有其特定的意义。
The canopy structure of fruit trees is not composed of a large number of arc branches, but is composed of many branches with many branches and groups that are morphologically and physiologically independent. Unit branches according to their different functions in the canopy can be divided into units to extend the unit branches, the results unit sticks, update unit technology. The strength of its growth potential can be divided into strong, medium and weak three kinds of branches. Because unit branches have morphological and physiological relative independence on the canopy, they have particular significance in studying crown structure, canopy development and pruning, thinning, thinning and other production practices, as well as sampling of the study .