关键词: 观赏草, 铜锌复合胁迫, 种子萌发, 幼苗生长, 隶属函数法

Abstract: In order to explore the tolerance to copper-zinc combined stress in the germination stage of ornamental grass,8 ornamental grasses were used as experimental materials,and the hydroponic method was used as the test method. The effects of different concentrations of stress on the growth and development of the test materials during germination and the differences among the varieties were studied.The results showed that with the increase of stress concentration,the germination rate,germination potential,germination index,vigor index,seedling length,root length and seedling fresh weight of 8 species of ornamental grasses showed gradual decline.They had an extremely significant negative correlation with the stress concentration,and the inhibition was the most in Cu²⁺500 mg/ L and Zn²⁺800 mg/L treatment.There were large differences among different varieties,and the overall performance was that the 4 species of Pennisetum ornamental grasses were more tolerant than the 4 species of Miscanthus ornamental grasses.Through comprehensive evaluation and analysis by subordination function method,the tolerance was in the order of P.alopecuroides cv.‘Little Bunny’>P.setaceum ‘Rubrum’ >P.orientale ‘Tall tails’ >P.setaceum>M.sinensis ‘Gracillimus’>M.sinensis ‘Variegatus’>M.sinensis ‘Morning Light’>M.sinensis ‘Zebrinus’.

Key words:  Ornamental grass, Copper-zinc combined stress, Seed germination, Seedling growth, Membership function method