According to the soluble components of salt-alkaline grassland of the Northeast of China, eight-week-old seedlings of Puccinellia tenuiflora were stressed by exposure to 1:1 molar-ratio mixtures either of the two neutral salts NaCl and Na2SO4 or of the two alkali salts NaHCO3 and Na2CO3, which were simulated conditions of 0-24mmol/L salt stress or alkali stress. To identify the physiological mechanisms involved in this plant’s resistance to alkali stress, the relative growth rates, dry matter accumul...