关键词: 苜蓿, 苏打盐碱, 隶属函数, 聚类分析, 综合评价

Abstract: In view of the shortage of alfalfa (Medicago sativa L.) varieties suitable for cultivation in soda saline-alkali land in Heilongjiang Province, eleven alfalfa varieties with good cold tolerance were selected as experimental materials, and soda saline-alkali soil collected from Songnen Plain was used as the growth medium. The germination index, seedling growth index and root physiological index of alfalfa were tested by soil culture method, and the salt-alkali tolerance of alfalfa germplasm at seedling stage was evaluated by cluster analysis and membership function analysis. It was found that high pH soda salinity inhibited alfalfa germination and growth, and the average germination potential decreased by 53.83%, the average germination rate decreased by 29.36%, the average germination index decreased by 34.90%, and all growth indexes (except root length) decreased by more than 52%. According to the analysis results, eleven alfalfa varieties were divided into four categories, the first category was '3010’'Stockpile’'Gongnong No.1’ and 'Gongnong No.5’，the second category was 'Dongmu No.2’ and 'Long Mu 801’，the third category was 'Dongmu No.1’'Zhaodong’'Aohan’ and the fourth category was 'Polar Bear’. Conclusion:Among 11 alfalfa varieties with cold tolerance, 'Stockpile’ and '3010’ have the strongest alkali tolerance to soda, which laid a theoretical foundation for alfalfa planting in soda saline-alkali land in Heilongjiang Province.

Key words: Alfalfa, Soda saline-alkali, Membership function, Cluster analysis, Comprehensive evaluation