6种园林植物耐旱性分析

Drought Tolerance of Six Garden Species

为选择耐旱性较强的园林绿化植物,选择6种常见的园林植物:金银木(Lonicera maackii)、紫荆(Cercis chinensis)、紫薇(Lagerstroemia indica)、荆条(Vitex negundo var.heterophylla)、胡枝子(Lespedeza bicolor)和构树(Broussonetia papyrifera),进行盆栽控水试验,对植株外观形态和土壤含水率、叶片叶绿素含量、超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量进行比较。结果表明,随干旱胁迫时间的延长,土壤含水量均呈下降趋势,金银木、胡枝子和荆条的长势较好;紫薇、紫荆和构树出现叶片萎蔫、掉落现象,6种植物叶片的光合色素含量呈先上升后下降的趋势,除紫薇外,SOD活性总体均呈上升趋势,MDA含量持续上升。可见,金银木、胡枝子和荆条的耐旱性较强,紫薇、紫荆和构树的耐旱性较弱。

In order to select garden species with strong drought tolerance,six common garden species,such as Lonicera maackii,Cercis chinensis,Lagerstroemia indica,Vitex negundo var.heterophylla,Lespedeza bicolor,and Broussonetia papyrifera,were used by water control test in pots,and the morphology,soil water content,contents of chlorophyll and propylene dialdehyde(MDA),superoxide dismutase(SOD)activity in leaves were studied.The results showed that soil water content decreased with the extension of drought stress time.The growth of Lonicera maackii,Lespedeza bicolor and V.negundo var.heterophylla look like better,while that of Lagerstroemia indica,C.chinensis and B.papyrifera showed wilting and falling.Photosynthesis pigment contents of six species rose at first and then fall,the activity of SOD showed general upward trend except for Lagerstroemia indica,and the content of MDA rose continuously under drought stress.Therefore,the drought resistance of Lonicera maackii,Lespedeza bicolor and V.negundo var.heterophylla is strong,and that of Lagerstroemia indica,C.chinensis and B.papyrifera is weak.