Abstract:Seedlings of Aneurolepidium chinense (Trin.) Kitag. were subjected to stress with 30 kinds of 50 to 350 mmol/L of salt mixture which were composed of NaC1, NaHCO3, Na2SO4, and Na2CO3 in various proportion. The results showed that all the responded strains, such as changes in the relative growth rate (RGR), K+ and Na+ contents, content of proline accumulation, and leave electrolyte leakage rate, were aggravated with the increasing salt concentrations and the proportion of the basic salts. The strain reaction from high pH caused by the basic salt was closely related to salinity. The high pH reaction was weaker when the salinity was lower and became progressively stronger intensely with the increasing salinity. The results indicated that there were actually two stresses, the salt and the alkaline stress in the mixed salt stress. It was reasonable to consider the total salt concentration as the strength value of salt stress and the buffer capacity as the strength value of alkaline stress. When the alkaline stress was weak, the strain effect was mainly associated with the total salt concentration, but the buffer capacity became the dominant factor effecting strain with the increasing alkaline stress.