摘要:对24份盆栽多年生黑麦草种质材料在苗期采用反复干旱法试验,调查了地上、地下生物量、株高、分蘖数、根冠比5个形态学指标,通过存活率、抗旱指数、隶属函数法、主成分分析、聚类分析5种方法进行了抗旱性评价。结果表明:干旱胁迫下多年生黑麦草生长受到明显抑制,所有形态指标的抗旱系数 DRC 均具有显著差异,可作为多年生黑麦草抗旱性评价指标,除根冠比外均与抗旱性正相关。5种评价方法结果一致,抗旱指数法为单指标评价,简单快捷;隶属函数法为综合评价法,应用面广。根据隶属函数法可将供试多年生黑麦草材料分为4类:抗旱性强的有7623,7905和7932,抗旱性较强的7406、7722、7095、7252、7484、7454,抗旱性中等的为7814、7253、7544、7431、7101、7053,抗旱性较差的有7847、7288、7530、7054、7151、7192、7840、7261、7442。%The drought resistance of 24 Lolium perenne germplasm materials were evaluated in seedling stage by repeated drought method.The morphology index including the aboveground biomass,underground bio-mass,plant height and tiller number and root-shoot ratio,were measured and drought-resistance was evaluated according to survival rate,drought-resistance index(DRI),subordinate function values,principal component a-nalysis(PCA)and cluster analysis.The results indicated that the normal growth in seedling period was signifi-cantly inhibited under drought stress because the drought resistance coefficient (DRC)of all morphology index in different varieties had significant difference.Therefore,these index may be used as evaluation index.Except root-shoot ratio,these indexes had the postive correlation with the drought resistance.The results by 5 evalua-tion methods were similar.DRI were single index and simple,subordinate function values were comprehensive assessment index and wide application.According to the subordinate function values,these Lolium perenne germplasm were classified into 4 categories,the strongest stains were No.7623,No.7905 and No.7932,the stronger stanis were No.7406,No.7722,No.7095,No.7252,No.7484,No.7454,the middle stains were No. 7814,7253,No.7544,No.7431,No.7101 and No.7053,the poor stains were No.7847,No.7288,No.7530,No. 7054,No.715 1,No.71 92,No.7840,No.7261 and No.7442.