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在土壤干旱情况下研究了紫羊茅、黑麦草对渗透胁迫的反应以及各项水分参数的变化。结果表明，土壤水分胁迫下，两品种叶片相对含水量、水势、渗透势、膨压势均随胁迫天数、胁迫强度的增加而下降；同级胁迫程度，抗旱性较强的紫羊茅各指标均高于抗旱性较弱的黑麦草；胁迫解除后，两品种所有指标均回升，不表现渗透调节能力；水势与渗透势及膨压势均为线性关系，水势每变动１兆帕，渗透势变动紫羊茅０．６７６９＞黑麦草０．４６４３，而膨压势降低单位数紫羊茅０．３６１５＜黑麦草０．４５４２；渗透调节能力为紫羊茅＞黑麦草。
Under the condition of soil drought, the responses of purple fescue and ryegrass to osmotic stress and the changes of various water parameters were studied. The results showed that under water stress, the relative water content, water potential, osmotic potential and swelling potential of two varieties decreased with the days of stress and the increase of stress intensity. The indexes of the same level of stress and drought resistance Higher than that of the ryegrass with weaker drought resistance. After the stress was relieved, all the indexes of the two cultivars rose without any osmotic adjustment. The water potential was in a linear relationship with the osmotic potential and the turgor potential. Each time the water potential was changed to 1 MPa, the osmotic potential changed Red fescue 0.6769> ryegrass 0.4643, while the tweezers decreased the number of units of red fescue 0.3615 ryegrass.