七种高架桥下荫庇区绿化植物的抗旱性研究

选择了7种能耐高架桥下荫庇环境的园林植物,通过试验比较其抗旱性。结果表明,观赏效果受影响的程度排序为狭叶栀子大吴风草矾根花叶蔓长春顶花板凳果麦冬扶芳藤;叶片初始萎蔫和永久萎蔫出现时土壤含水量排序均为大吴风草矾根狭叶栀子花叶蔓长春顶花板凳果扶芳藤麦冬;叶片永久萎蔫出现时干旱持续时间排序为扶芳藤顶花板凳果麦冬=矾根大吴风草狭叶栀子花叶蔓长春。7种园林植物的综合抗旱性排序为顶花板凳果、扶芳藤麦冬大吴风草、矾根狭叶栀子、花叶蔓长春。在夏季,麦冬、扶芳藤和顶花板凳果能耐15~20 d的干旱,矾根能耐13~15 d的干旱,花叶蔓长春、狭叶栀子和大吴风草只能耐10 d以内的干旱。

Study on Drought Resistance of Seven Landscaping Plants Selected for Shaded Area Under the Viaduct

Seven plants suited to shade environment under the viaduct were selected by shading experiment, then they were subjected to water stress in glass greenhouse. The results showed that, the order of influence on ornamental value was Garde-nia stenophylla>Farfugium japonicum>Heuchera micrantha>Vinca major Linn. cv. Variegata>Pachysandra terminalis>Ophiopogon japonicus>Euonymus fortunei; The soil water content when the leaf initial and permanent wilting point appeared were F. japonicum>H. micrantha>G. stenophylla>V. major Linn.cv. Variegata>P. terminalis>E. fortunei>O. japonicus; The duration of drought when the leaf permanent wilting point appeared were E. fortunei>P. terminalis>O. japonicus=H. micrantha > F. japon-icum>G. stenophylla>V. major Linn. cv. Variegata. The integrated drought resistance of seven plant species were P. terminalis, E. fortunei>O. japonicus> F. japonicum, H. micrantha> G. stenophylla,V. major Linn. cv. Variegata. In summer,P. terminalis, E. fortunei and O. japonicas could tolerate 15~20 days drought, H. micrantha could tolerate 13~15 days drought,but G. stenophylla,V. major Linn. cv. Variegata and F. japonicum could tolerate less 10 days drought.