中文摘要：

利用盐土和棉田土，采用水平根垫法对4种不同类型的荒漠盐生植物进行栽培实验，应用冰冻薄层切片法对距根表不同距离的土壤进行分层取样，并测定不同层次土壤中pH、总盐、Cl^-、SO4^2-、Na^＋、K^＋、Ca^2＋和Mg^2＋的含量。结果表明： 在盐土中，距根表不同距离的土壤中，pH值呈有规律的梯度分布，即根际微区pH值较土体下降，且距根表越近，pH值越低;而在棉田土中却没有显著变化;总盐在根际出现较大的亏缺区，最大亏缺率位于距根表0～4 mm处;在盐土中，除芦苇外，其余3种盐生植物的根际土中Cl^-、SO4^2-、Na^＋、K^＋、和Mg^2＋的含量在根际有明显的富集;在棉田土中，除K^＋外，这些离子在根际也有富集，但富集程度比盐土低，K^＋表现亏缺，而Ca^2＋却是富集的;4种植物尤其是稀盐盐生植物和泌盐盐生植物，地上部分的主要盐离子（如Cl^-、Na^＋、Ca^2＋和K^＋）含量比地下部分高，在根际富集程度最高的Cl^-和Na^＋，在植株的地上部分也增加的最多。

英文摘要：

With saline soil and non-saline soil （ cotton soil） as test soils, four types of desert halophytes were planted in pots by using horizontal root-mat method. Stratified soil samples at different distance from rhizoplane were collected by slicing the frozen thin soil layer, and their pH value and the contents of total salt, Cl^- , SO4^2- , Na^＋ , K^＋ , Ca^2＋ and Mg^2＋ were determined. The results indicated that in saline soils, the pH value at different distance from rhizoplane presented a regular gradient distribution, i. e. , the nearer the distance from the rhizoplane, the lower the pH was; while in cotton soil, the pH had no significant variation. There was a relatively great salt-deficit area in rhizosphere, with the highest deficit rate appeared at 0-4 mm from rhizoplane. In saline soil, an enrichment of Cl^- , SO4^2- , Na^＋ , K^＋ and Mg^2＋ was observed in the rhizosphere of all test plants except Phragmites communis; and in cotton soil, the ions except K^＋ also showed a high concentration in rhizosphere, but lower than that in saline soil. Additionally, in cotton soil, K^＋ was in deficit, while Ca^2＋ was rich. All test plants, especially succulent halophytes and salt-secreting halophytes, had higher contents of Cl^-, Na^＋, Ca^2＋ and K^＋ in their aboveground part than in their underground part. Cl^- and Na^＋ had the highest content in rhizosphere, and showed the largest accumulation in aboveground part of plants.