4种灌木树种的耐荫性研究

A Study on Shade Tolerance of Four Shrub Species

以进入城市园林绿化树种行列的大花溲疏、荆条、蚂蚱腿子、小桐子4种喜光灌木树种为对象,研究其耐荫性能。对此4种植物进行不同程度的遮荫处理后,测定其叶片的光合作用、呼吸作用及其相关生理指标的变化,比较了遮荫对此4种喜光灌木树种所造成的一些生理变化,并对这4种喜光灌木树种耐荫性的强弱进行了综合排序。研究发现,遮荫对此4种灌木树种的光合特性等生理指标都有不同程度的影响,其耐荫性的综合排序结果为:蚂蚱腿子的耐荫性最强,大花溲疏次之,再次是小桐子,而荆条的耐荫性最弱。

The shade tolerance of four light-loving shrub plants namely Deutzia grandiflora, Vitex negundo var. heterophylla, Myripnois dioica and Jatropha curcas were studied. Different shading treatments were imposed on the tested plant species, the photosynthesis, respiration and change of relative physiological data were measured so as to compare the physiological change caused of these four species caused by shading treatment, and the shade tolerance of these tested species were ranked. The study results showed that shading treatment affected photosynthesis and other relative physiological indexes to different extends, the shade tolerance of decreased in the order of Myripnois dioica, Deutzia grandiflora, Jatropha curcas and Vitex negundo var. heterophylla.