The heat tolerance of 18 trefoil varieties were compared and evaluated comprehensively combined with germination and seedling field experiment. The results showed that the germination rate and the germination index declined with the temperature increasing. The seeds from all trefoil varieties could not germinate at the 40℃. The leaf firing rate, the survival rate of seedling and the leaf relative water content were different greatly in all varieties. The results of comprehensive appraisal indicated that the variety'Tetri' was the highest tolerant to heat, the variety 'New Zealand' was higher tolerant, and the varieties 'Haifa','Huia','G18','Gollum','Retor','Badong','Pawera','Emu No 1' and so on were mid-tolerant to heat, 'Crau','Pitau','Aurora','Tetra' were the varieties with lower tolerance to heat, while the tolerance to heat of variety 'Louisiana' was the lowest. It was suggested that the varieties with higher heat tolerance should be planted in Yangtze River and its south region of China.%对18个三叶草品种耐热性进行了比较,并结合芽期和成苗试验,综合评价了各品种的耐热性强弱.结果表明:发芽率、发芽指数随温度的升高而降低,在40 ℃时种子不发芽;叶片灼伤率、植株存活率和叶片相对含水量在各品种之间差异较大.对耐热性综合评价表明,18个品种中特特里红三叶属强耐热品种;新西兰白三叶耐热性较强;海法白三叶、胡依阿白三叶、G18白三叶、戈伦红三叶、雷托白三叶、巴东红三叶、帕韦拉红三叶、鄂牧1号白三叶、罗汤地红三叶、新西兰杂三叶、2-2-1杂三叶为中等耐热品种;克劳白三叶、皮陶白三叶、奥罗拉杂三叶和蒂特拉杂三叶品种耐热性较弱,耐热性最弱的是路易斯安娜白三叶.建议在长江流域及长江以南地区选择耐热性较强的几个品种进行推广示范.
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