Abstract: A neutral salt(NaCl) solution and various mixed salt(NaCl,Na₂SO₄,NaHCO₃,Na₂CO₃ in different proportions) solutions with different pH values were used to imbibe Albizia julibrissin seeds to simulate alkali-salt stresses.Results indicated that there were significantly negative correlations between germination rate,germination energy,germination index and vigor index of the stressed seeds and the salt concentrations.With the increasing of salt concentrations,the activities of SOD,POD and CAT displyed a mold of increasing at beginning and then decreasing.The mixed salts exerted stronger stress on young seedlings than the neutral salt.It was found that there was an obvious synergism between salt stress and pH stress and the mixed salts were more harmful than neutral salt to the seed germination and the seedlings of Albizia julibrissin.

Key words: Albizia julibrissin, alkali-salt stress, seed germination, enzymatic activity