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Reaumuria soongorica and Salsola passerina have significant differences in ecophysiological characteristics,which change with the environmental variations.Although they live together for a long period of time,their adaptive mechanisms to environmental stresses are very different.As two extreme xerophytes,Reaumuria soongorica and Salsola pavserina differ significantly from other psammophytes in ecophysiological characteristics; they can survive in lower water potential,and can even grow in piedmont areas.Low water potential may be related to the existence of osmosis-regulating substance,such as praline,which can strengthen the capacity of water absorption.Compared to other psammophytes,Reaumuria soongorica and Salsola pavserina have a higher degree of photo-inhibition under the same condition,and the photo-inhibition can lead to destruction of the photosynthetic pigment,nevertheless,this photo-inhibition can be repaired under suitable conditions in the morning and evening.