中文摘要：

以塔里木盆地南缘关键物种疏叶骆驼刺为材料,研究了不同盐渍土壤生境（轻度盐渍土、中度盐渍土、重度盐渍土）下其器官间Na^＋、K^＋、Ca^（2＋）、Mg^（2＋）的分布、吸收及运输特征,以探讨疏叶骆驼刺对自然盐渍生境的适应特性.结果表明：在轻度和中度盐渍土生境,Na^＋在各器官中的分布规律为茎≈刺〉叶〉根,而在重度盐渍土生境,Na^＋分布规律为叶〉茎≈刺〉根;Ca^（2＋）和Mg^（2＋）在疏叶骆驼刺体内的分布规律为叶〉刺〉茎〉根.随着土壤含盐量的增加,疏叶骆驼刺体内各器官Na^＋含量都增大,而叶片中K^＋含量呈下降趋势;根和叶器官中K^＋/Na^＋值明显降低,各器官中Ca^（2＋）/Na^（＋）、Mg^（2＋）/Na^＋值都降低.盐渍生境下,疏叶骆驼刺体内Ca^（2＋）选择性运输系数和Mg^（2＋）选择性运输系数均为茎-叶〉茎-刺〉根-茎.疏叶骆驼刺为适应盐渍生境,在土壤含盐量较低时,将Na^＋聚集于茎和刺;而在土壤含盐量较高时,则将Na^＋聚集于叶片.此外,Ca^（2＋）和Mg^（2＋）可能是疏叶骆驼适应盐渍生境的无机渗透调节物质.

英文摘要：

In order to explore the adaptive capacity of Alhagi sparsifolia to soil salinity （mild, mo- derate, severe saline soil）, the distribution, adsorption and translocation characteristics of Na＋, K＋, Ca2＋, ng2＋ in different organs of A. sparsifolia, which is a dominant native vegetation in south- ern edge of Tarim basin, were investigated. The results showed that when grown on a mild and mod- erate saline soil, Na＋ distribution in different organs of A. sparsifolia followed the order of stem thorn〉leaf〉root; when grown on a severe saline soil, Na＋ distribution followed leaf〉stem thorn〉 root. The distribution of Ca2＋ and Mg2＋ followed leaf 〉thorn〉stem〉root. With the increase of soil salt level, Na＋ content in different organs of A. sparsifolia increased, while K＋ content in leave de- creased; meanwhile the increasing soil salt level significantly decreased the K＋/Na＋ ratio in both root and leave, as well as the Ca2＋/Na＋ and Mg2＋/Na＋ ratios in all organs. The selective transporta- tion coefficients for Ca2＋-Na＋ and Mg2＋-Na＋ followed order of stem-leaf〉stem-thorn〉root-stem under saline habitats. Based on the integrated analysis, in order to adapt to salinity habitat, A. sparsifolia could use multiple organs to accumulate Na＋, depending on soil salt level. Na＋ could accumulate in stem and thorn at a relative low level, but in leaves at high levels. Besides, Ca2＋and Mg2＋ could be the inorganic osmotic adjustment substances for A. sparsifolia to adapt the saline environment.