为筛选适宜北京地区种植的抗旱能力强的地被植物,通过观察植物的整体生长状况及叶片受损情况,测定过氧化氢酶(CAT)、过氧化物酶(POD)、超氧化物歧化酶(SOD)活性,丙二醛(MDA)质量摩尔浓度,及脯氨酸(Pro)、可溶性蛋白(SP)、淀粉、可溶性糖(SS)质量分数等8项抗旱指标,采用隶属函数分析、主成分分析、聚类分析等方法对大叶铁线莲、委陵菜、荆芥、甘菊、求米草、野菊、紫花地丁、蒲公英、涝峪薹草等9种地被植物的抗旱性进行综合评价。结果表明:1)干旱胁迫下,MDA、SS、淀粉、Pro质量分数及POD活性呈上升趋势,SP质量分数、SOD活性呈先下降后上升的趋势,CAT活性呈先上升后下降的趋势;2)9种地被植物中,蒲公英、委陵菜、荆芥的抗旱能力较强,大叶铁线莲、求米草的抗旱能力较弱。蒲公英、委陵菜、荆芥适宜在北京地区推广应用;大叶铁线莲和求米草在北京地区应用时应注意水分管理。

In order to screen the ground cover plants with strong drought resistance suitable for planting in Beijing,eight drought-resistance indices such as catalase(CAT),peroxidase(POD),superoxide dismutase(SOD)activity,malondialdehyde(MDA)molality,proline(Pro),soluble protein(SP),starch and soluble sugar(SS)mass fractions were determined by observing the overall growth and leaf damage of plants.The drought resistance of 9 ground cover plants,including Clematis heracleifolia,Potentilla chinensis,Nepeta cataria,Chrysanthemum lavandulifolium,Oplismenus undulatifolius,Chrysanthemum indicum,Viola philippica,Taraxacum mongolicum,Carex giraldiana,were comprehensively evaluated by subordinate function analysis,principal component analysis and cluster analysis.The results showed 1)During the period of drought stress treatment,POD activity,MDA content,soluble sugar,starch and Pro content increased,soluble protein content and SOD activity decreased initially before increasing,and CAT activity showed an initial increase followed by a subsequent decline.2)Combined with the overall growth of the plant and the damage of the leaves and the comprehensive evaluation results,among the nine species,Potentilla chinensis,Nepeta cataria and Taraxacum mongolicum had stronger drought resistance,and Clematis heracleifolia and Oplismenus undulatifolius had weaker drought resistance.Therefore,dandelion,Potentilla chinensis and Schizonepeta tenuifolia are suitable for promotion and application in Beijing,while water management t is essential for the cultivation of Clematis heracleifolia and Oplismenus undulatifolius are applied.