论文部分内容阅读
甘蒙柽柳（ＴａｍａｒｉｘａｕｓｔｒｏｍｏｎｇｏｌｉｃａＮａｋａｉ）、多枝柽柳（Ｔ．ｒａｍｏｓｉｓｉｍａＬｅｄｅｂ．）、中国柽柳（Ｔ．ｃｈｉｎｅｎｓｉｓＬｏｕｒ）、短穗柽柳（ＴｌａｘａＷｉｌｄ．）、刚毛柽柳（Ｔ．ｈｉｓｐｉｄａＷｉｌｄ．）、密花柽柳（Ｔ．ａｒｃｅｕｔｈｏｉｄｓＢｇｅ．）、甘肃柽柳（Ｔ．ｇａｎｓｕｅｎｓｉｓＨ．Ｚ．Ｚｈａｎｇ）和短毛柽柳（Ｔ．ｋａｒｅｌｉｎｉＢｇｅ．）在土壤缓慢水分胁迫条件下，脯氨酸（Ｐｒｏ）含量成倍增加。整个干旱处理过程中，Ｐｒｏ累积持续时间、初始累积和累积速度下降，种间存在差异。可溶性糖含量明显持续增加。正常供水条件下可溶性糖含量以及水分胁迫条件下可溶性糖含量增加值种间存在显著差异。Ｋ＋积累速率持续增加直至干旱处理结束，Ｋ＋积累速率种间存在差异。正常供水条件下Ｎａ＋在植物体内含量较高，土壤水分胁迫条件下Ｎａ＋大量积累。Ｍｇ２＋在整个干旱处理过程中，没有主动积累。有机溶质Ｐｒｏ、可溶性糖、无机离子Ｋ＋、Ｎａ＋在土壤水分胁迫条件下主动累积，降低柽柳体内渗透势，维持膨压，为干旱逆境条件下植物维持正常生命活动创造条件
Tamarix austromongolica Nakai, T.ramosisima Ledeb., T. chinensisLour, TlaxaWild., T.hispidaWild., T.arceuthoidsBge. ), T.gansuensisH.Z.Zhang and T.kareliniBge. In the condition of slow soil water stress, the content of proline (PRO) increased exponentially. Throughout the drought treatment, Pro accumulation duration, initial accumulation and accumulation rate decreased, there was a difference between species. Soluble sugar content increased significantly. There were significant differences in soluble sugar content under normal water supply conditions and soluble sugar content under water stress conditions. K + accumulation rate continued to increase until the end of the drought treatment, K + accumulation rate differences between species. Under normal water supply, Na + is higher in plants and Na + accumulates in soil under water stress. Mg2 + did not accumulate actively throughout the drought treatment. Organic solute Pro, soluble sugar, inorganic ions K + and Na + accumulate actively under the condition of soil water stress, reduce the osmotic potential in tamarisk body and maintain the turgor pressure and create the conditions for plants to maintain their normal life activities under drought stress