In the context of global warming and increasing scarcity of water resources,the selection and application of water-saving and drought resistant landscaping tree species are particularly important.Under long-term hot and sunny weather conditions in summer,the water physiological indexes such as leaf water po-tential,relative water loss,water loss rate and ratio of bound water to free water were measured and analyzed in 11 common landscaping tree species in Huainan City.The drought resistance of each tree species was com-prehensively evaluated using membership function method.The results were as follows.(1)The value of each parameter in the 11 landscaping tree species were different and showed significant differences,so they exhibi-ted different response characteristics to drought stress.Comprehensive analysis results indicated that Jasminum nudiflorum and Loropetalum chinense var.rubrum showed higher water stress level with poor water physiological status and low drought tolerance.Salix babylonic,Celtis sinensis,Viburnum odoratissimum and Buxus megisto-phylla showed lower water stress level with more vigorous physiological and metabolic activities and stronger drought resistance.Magnolia grandiflora had higher water use efficiency and lower natural water loss rate,making it possible to survive for a long time in harsh environments with high temperature and drought.(2)The comprehensive evaluation results obtained by membership function method showed that the order of drought re-sistance of the 11 tested tree species was Salix babylonica>Celtis sinensis>Buxus megistophylla>Viburnum odo-ratissimum>Ginkgo biloba>Prunus lannesiana>Magnolia grandiflora>Loropetalum chinense var.rubrum>Ligus-trum japonicum'Howardii'>Jasminum nudiflorum>Pittosporum tobira.(3)The tested tree species were divid-ed into three groups with high,medium and lower drought resistance respectively based on system clustering a-nalysis.Buxus megistophylla,Viburnum odoratissimum,Salix babylonica and Celtis sinensis had relatively high-er drought resistance.Considering drought resistance alone,Salix babylonica and Celtis sinensis were the pre-ferred tree species for landscaping and greening in Huainan City.However,Buxus megistophylla was the pre-ferred species when taking both drought resistance and water conservation into account.The research results could provide data support and reference for construction of water-saving and drought resistant gardens in Hua-inan and other cities along the Huaihe River Basin.
关键词
高温干旱环境/节水型园林/耐旱性绿化树种/水分生理特性
Key words
High temperature and arid environment/Water-saving landscaping/Drought-resistant land-scaping tree species/Water physiological characteristics
维普
万方数据