9种园林地被植物的抗旱性评价

Evaluation of Drought-resistance of Nine Landscape Ground Cover Plants

[目的]测定9种地被植物在干旱胁迫下的形态和生理生化指标变化,分析其变化规律与植物抗旱性之间的关系,为地被植物在园林中的应用提供科学依据。[方法]通过观察和测定委陵菜、红花酢浆草、草地早熟禾、崂峪苔草、紫花地丁、麦冬、野牛草、蛇莓和马蔺9种地被植物的存活率、过氧化物酶(POD)、超氧化物歧化酶(SOD)、丙二醛(MDA)、细胞质膜透性5项抗旱指标,运用隶属函数值法对其综合抗旱适应性进行定量评价。[结果]随着干旱胁迫程度的加深,9种参试植物的外部形态特征表现出明显差异;SOD活性总体表现为先上升后下降的趋势,POD活性总体表现为先下降后上升的趋势;MDA含量总体呈增加趋势;干旱胁迫对9种参试植物的质膜透性均产生影响,但各植物的表现不同。[结论]9种地被植物的综合抗旱性表现为麦冬>崂峪苔草>马蔺=蛇莓>野牛草>紫花地丁>红花酢浆草>草地早熟禾>委陵菜。

[Objective]To determine the changes of morphological,physiological and biochemical indexes of 9 ground cover plants under drought stress,and analyze the relationship between the change law and plant drought resistance,so as to provide scientific basis for the application of ground cover plants in landscape architecture.[Method]Observation and determination of the survival rates,peroxidase(POD),superoxide dismutase(SOD),malondialdehyde(MDA)and cytoplasmic membrane permeability of 9 types of ground cover plants,including Potentilla chinensis,Oxalis corymbosa,Iris lacteal,Buchloe dactyloides,Poa pratensis,Duchesnea indica,Carex giraldiana,Viola philippica,Ophiopogon japonicas.Applying the method of subordinate function,5 physiological drought-resistance indexes of 9 ground cover plants were measured and a quantitative evaluation on comprehensive drought resistance of them was given.[Result]With the deepening of drought stress,the external morphological characteristics of the nine tested plants showed significant differences.The activity of SOD increased first and then decreased,the activity of POD decreased first and then increased.The content of MDA increased;drought stress affected the permeability of plasma membrane of the nine tested plants,but the performance of each plant was different.[Conclusion]The comprehensive drought resistance of the nine ground cover plants was Ophiopogon japonicas>Carex giraldiana>Iris lacteal(Duchesnea indica)>Buchloe dactyloides>Viola philippica>Oxalis corymbosa>Poa pratensis>Potentilla chinensis.