The seed germination characteristics of 6 species of Lespedeza Mich.were studied by setting 7 constant and 2 alternative temperature treatments.The results showed that the suitable germination temperature range for L.floribunda Bunge.was the widest.Germination rates exceeded 88.0％ in almost all treatments except for 40℃(only 45.0％).Germination of L.davurica (Laxm.).Schindl.showed a greater resistance to high temperature,Germination rates were 90.0％ over 35℃.The High and low temperature had great influence on delaying seed germination of Lespedeza bicolor Turcz.,which showed a temperature sensitive feature.Germination index of all materials except for Lespedeza bicolor Turcz.showed an increasing trend in a certain temperature range and then declined sharply over 35℃.Vigor index of the 6 species were the maximum at constant temperature 25℃ and 30℃.In general,the optimum germination temperature for L.floribunda Bunge.,L.formosa (vog.) Kochne.and L.davidii Franch.were 25℃,L.cuneata (Dum Cours.) was 30℃,but the seed of Lespedeza bicolor Turcz.and L.davurica (Laxm.).Schindl.had the best germination under alternative temperature 25/35℃.
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