中文摘要：

采用植物水培方法，以乌拉尔甘草为研究材料，用不同浓度（0、80、160、320 mmol·L^-1）NaCl溶液胁迫处理乌拉尔甘草幼苗3周后，分析其叶片表面盐离子（K^＋、Ca^2＋、Na^＋）分泌速率的差异，并采集盐化低地草甸重盐土生境中2年生乌拉尔甘草植株，应用ICP AES测定其不同部位（根、根状茎、茎、老叶和幼叶）中的盐离子（K^＋、Na^＋、Ga^2＋、Mg2＋）含量，探究盐离子在乌拉尔甘草叶片上的分泌格局以及盐离子在植株体内的积存格局，为完善甘草耐盐机理的研究提供依据。结果显示：（1）随着盐胁迫浓度的升高，乌拉尔甘草叶片上K^＋、Ca^2＋、Na^＋的分泌速率均呈增加趋势，且Na^＋的分泌速率远远大于Ca^2＋和K^＋的分泌速率。（2）在乌拉尔甘草各部位中，K^＋ 的积存量从大到小依次为：幼叶〉根〉根状茎〉茎〉老叶；Na^＋在各个部位的积存量都十分有限，且无论地下部分还是地上部分，差异均不大；Ca^2＋积存量由大到小依次为：老叶〉幼叶〉茎〉根状茎〉根，且老叶中Ca^2＋的积存量显著高于其它部位。研究认为，在重盐碱地生境中，K^＋主要积存在幼叶中，Ga^2＋主要积存在老叶中，植株体内各个部位Na^＋的积存量很低，乌拉尔甘草表现出明显的拒Na现象；叶片分泌的主要盐离子为Na^＋；乌拉尔甘草通过泌盐的方式将Na^＋排出体外，从而有效降低Na^＋在体内的积存，这是其能够在重盐碱地生存生长的重要原因。

英文摘要：

In order to explore the salt distribution patterns in different organs and the characteristic of salt secreted from leaves of Glycyrrhiza uralensis, we cultured G. uralensis seedlings with a complete Hoagland nutrient solution containing 0, 80, 160 and 320 mmol·L^-1 NaCl for 21 days. The contents of K^＋, Ca^2＋ and Na^＋ secreted from the leaves were measured by ICP AES; In addition, two year old G. uralensis grew in heavy saline alkali soil were collected, the contents of K^＋, Na^＋, Ga^2＋ and Mg2＋ in different organs （roots, rhizomes, stems, old leaves and young leaves） of G. uralensis were measured by ICP AES. The aim for this study is to provide reference for salt tolerance theory of G. uralensis by comparing the salt accumulation characteristics with salt secretion characteristics. The results were shown that： （1） more salt ions secreted from leaves of G. uralensis with the increased concentration of NaCl, and the secretive content of Na^＋ was much greater than that of Ca^2＋ and K^＋. （2） The order of accumulation of K^＋ among the different organs was young leaves 〉 roots 〉 rhizomes 〉 stems 〉 old leaves; Na^＋ accumulation in every organ is very limited and have no significant difference among them; The order of Ca^2＋ accumulation among the different organs was old leaves 〉 young leaves 〉 stems 〉 rhizomes 〉 roots; All in all, in high salt habitats, the young leaves is the main organ to accumulate K^＋, the old leaves is the main organ to accumulate Ca^2＋. It is a obvious characteristic that G. uralensis reject accumulating Na^＋, the content of Na^＋ in every organ of G. uralensis is very low; Na^＋ is the main salt ion secreted from leaves; G. uralensis can avoid accumulating excessive Na^＋ in the plant by excluding Na^＋, which is the main reason that G. uralensis can grow in high salt habitats.