塔里木河中游地区3种植物的抗旱机理研究

对塔里木河中游地区沙吉力克、阿其河等断面地下水位进行监测并对胡杨、柽柳、芦苇3种植物的可溶性糖、脯氨酸等生理指标进行测定分析.研究显示：（1）塔里木河中游地区植物生长与地下水位变化关系密切,随着不同断面地下水位埋深程度的增加,植物体内可溶性糖与脯氨酸含量呈增加趋势;（2）在干旱胁迫情况下,植物通过可溶性糖、脯氨酸等渗透调节物质的积累来提高自身的抗旱性;（3）植物叶片可溶性糖和脯氨酸的积累存在互相补偿的关系.研究表明在相同水分胁迫下,柽柳和芦苇对地下水位的变化更为敏感,胡杨的抗旱性较强.

Drought Resistance Mechanism of Three Plant Species in the Middle Reaches of Tarim River,China

By measuring groundwater level of Shajilike and Aqihe sections in the middle reaches of Tarim river and analyzing physiological characteristic of soluble sugar and proline of Populus euphratica,Tamarix spp.and Phragmites communis,the relationships between two physiological indexes and the groundwater level were investigated.The results indicated that(1) with groundwater level descending and degree of drought stress increasing,the accumulation of soluble sugar and proline of vegetation showed obviously increasing trend;(2)Under drought stress,vegetation depended on accumulation of soluble sugar and proline to increase capacity of its drought resistance;(3)The contents of soluble sugar and proline had a relationship of compensation each other were also discovered.In addition,it is obvious that under the same stress of groundwater level,Tamarix spp.and Phragmites communis are more sensitive than Populus euphratica.In other words,Populus euphratica had the strongest drought resistance among the three plant species for the changes of groundwater level.