中文摘要：

采用盆栽试验，研究了网状、心形和红皮沙拐枣在干旱胁迫和复水过程中的生理生态响应特征，并采用隶属函数法对3个沙拐枣种的抗旱性进行综合评价。结果表明，干旱胁迫下，红皮沙拐枣的相对含水量、水势和叶绿素含量均较高，但在复水后，恢复较慢。在干旱和中等灌溉处理下红皮沙拐枣的MDA含量最低，质膜损伤程度最轻，复水后恢复却较慢；在最高灌溉处理下，红皮沙拐枣的MDA含量却最高，复水后恢复也最快。干旱处理后3个沙拐枣种均有大量的渗透调节物质（脯氨酸和可溶性糖）累积，在最低灌溉量下为心形〉红皮〉网状沙拐枣，中等和最高灌溉处理下则为网状〉心形〉红皮沙拐枣，复水后降低幅度则为心形〉红皮〉网状沙拐枣。不同处理下心形沙拐枣的根冠比均显著高于其他种，网状沙拐枣相对较低。抗旱性综合评价结果为红皮〉网状〉心形沙拐枣。可见，各项测定指标的种问差异和综合评价结果并不完全一致，总体来看红皮沙拐枣对干旱胁迫的适应性最强，可优先推荐在当地种植。

英文摘要：

The influence of drought stress and re-watering on the ecophysiological characteristics of Calligonum cancellatum, C. cordatum, and （3. rubicundun was studied in a pot experiment under three irrigation treatments. The comprehensive drought resistance of the three Calligonum was compared with their subordinate function. Under water stress, relative water content, water potential, and chlorophyll content of assimilating branches were higher for C. rubicundun, but recovered more slowly after re-watering compared with those of other species. After water stress, the malondialdehyde （MDA） content was lower and recovered more slowly for C. rubicundun under drought and medium irrigation treatments, but was higher and recovered more quickly at high irrigation levels compared with other species. There was a large number of osmotic adjustment substances （soluble sugar and proline） accumulated in the assimilating branches of the three Calligonum under water stress. The contents of osmotic adjustment substances under drought treatment were in the following order： C. cordaturn〉C, rubicudun〉C, cancellatum, but under medium and high irrigation treatments they were C. cancellatum〉C, cordatum〉C, rubicundun. However, the contents of osmotic adjustment substances in C. cordatum decreased more significantly compared to other species after re-watering. In addition, C. cordatum had significantly higher root/shoot ratios than the other species. Based on the determined indexes under water stress, the comprehensive drought resistance was in the following order： C. rubicundun〉C, cancellatum〉C, cordatum. Obviously, the difference of each ecophysiological parameter among species was not consistent with that of comprehensive evaluation. Overall, C. rubicundun can be introduced for shelterbelt construction because of its strong tolerance and adaptability to drought stress in the southern fringe of the Taklimakan Desert.