刚毛柽柳体内Na~＋积累对盐分与水分胁迫的响应研究

目的]研究刚毛柽柳体内Na＋积累对盐分与水分胁迫的响应。方法]以盐生植物刚毛柽柳为材料,对其进行了不同水平的盐分和水分胁迫处理,并用电感耦合等离子发射仪（ICP-AES）测定了样品内的Na＋含量。结果]刚毛柽柳植株中Na＋的积累顺序为叶〉根〉茎,叶是Na＋累积的主要部位,茎只是一个Na＋传输通道,不存在累积过程;盐胁迫下刚毛柽柳体内Na＋含量随NaCl浓度的增加而逐渐升高,随胁迫时间的延长而增加;水分胁迫下刚毛柽柳体内Na＋含量随灌溉量的减少而增加,降低了根系的渗透势,并使根系在外界高NaCl浓度下保持水分,随着胁迫时间的延长,根和茎中的Na＋含量逐渐升高,但叶中则是先升高后降低。结论]为塔里木河下游受损生态系统的恢复与重建提供了参考。

Effects of Salt and Drought Stress on Na~+ Accumulation in Tamarix hispida

Objective] The aim was to study the effects of salt and drought stress on Na+ accumulation in Tamarix hispida.Method] Tamarix hispida was treated by different levels of salt and drought stress,and then Na+ accumulation in Tamarix hispida was determined by ICP-AES.Result] Na+ accumulation in Tamarix hispida was in order of leaf > root > stem,among them leaf was the main part of Na+ accumulation,while the stem was only a transport channel for Na+,so there was no cumulative process.Na+ content of Tamarix hispida increased with the increase of NaCl concentration,and also increased with the increase of stree time.Na+ content of Tamarix hispida decreased with the increase of irrigation,reduced the osmotic potential of root,and also made the root to maintain mositure around the high NaCl concentration.Na+ contents in root and stem of Tamarix hispida increased gradually with the increase of stress time,while Na+ content in leaf increased firstly and then decreased.Conclusion] The research provides reference for the restoration and reconstruction of damaged ecosystem in the lower reaches of Tarim River.