【摘要】 在土壤水分充足（含水量１３．１％ ）和干旱（４．７％ ）条件下，对处于沙漠化不同演替阶段的两种沙生植物冷蒿和差巴嘎蒿的多项抗旱性生理指标进行了测定，结果表明：１．在两种土壤水分状况下，冷蒿的相对水分亏缺、束缚水含量、束／自值、综合抗旱性指数和脯氨酸含量均明显高于差巴嘎蒿，水势均低于差巴嘎蒿。２．土壤水分由充足变为干旱时，冷蒿上述指标增加或降低的幅度远远大于差巴嘎蒿，如水分相对亏缺冷蒿增加 ７．３７％ ，差巴嘎蒿增加０．２９％ ；束缚水含量冷蒿增加 １１．５７％ ，差巴嘎蒿增加４．８１％ ，冷蒿的束／自值和脯氨酸含量的增加约为差巴嘎蒿的 １０ 倍。３．冷蒿的叶绿素含量（叶绿素ａ、叶绿素ｂ、总叶绿素）在土壤干旱且持续时间较长时均高于差巴嘎蒿，土壤水分充足时则低于差巴嘎蒿。４．土壤干旱时，冷蒿在一日内各时刻的蒸腾速率、气孔导度和水势值皆低于差巴嘎蒿，且日间波动平缓。更多还原

【Abstract】 The drought resistant indexes of Artemisia frigida and Artemisiaha lodendron in different desertifying succession phrases were measured under the two level of soil moisture(13.1% and 4.7%). The results are: 1. water potential of A. frigida is lower than that of A. halodendron but water relative deficit, bound water content, ratio of boundwater/free water(BW/FW), the comprehensive drought resistant indexes and the proline of A.frigida are higher than those of A. halodendron under two soil moisture level; 2.under the lower soil moisture level, the indexes of A. frigida increased more than those of A. halodendron, for instance, the relative water deficit and bound water content in A. frigida increased 7.37% and 11.57% but only 0.29% and 4.81% in A. halodendron, respectively, ratio of BW/FW and the proline of A. frigida increased ten times more than those of A. halodendron; 3. chlorophyll(a,b and a+b) of A. frigida was higher than that of A. halodendron when soil moisture remained low for a long time, but it was reverse when soil moisture was sufficient; 4. with soil drought, the day’ s mean value of transpiration rate, stomata conductance and water p