Abstract: In the field wind tunnel, the physiological status gas exchange characteristics and water relationship of three kinds of sand-fixing plants (including crust and bryophyte) were studied under wind blowing and wind-sand current condition, respectively. The effects of wind and wind- sand current were different. Wind caused erosion and desiccation of crest and bryophyte. The effects of wind on grass and shrub included:inhibited photosynthesis by expanded stomata; decreased leaf temperature and intercellular CO2 concentrations;enhanced transpiration and decreased water use efficiency; aggravated desiccation by lowered leaf water potential and water capacity of soil. But the effects of wind-sand current on crest and bryophyte were denudation and cumulation, on grass and shrub were mainly mechanical injury and more did on photosynthesis and water usage. The result that different plants responsed differently in adaptation to wind and wind-sand current stress may provide scientific basis for selecting sand-fixing plants.

Key words: Wind and wind-sand current, Sand-fixing plants, Physiological status