中文摘要：

在自然盐碱生境下，通过测定不同月份土壤和马蔺体内主要阳离子Na^＋、K^＋、Ca^2＋、Mg^2＋的含量，研究了主要阳离子的吸收、转运变化及其在马蔺体内的分布．结果表明：不同月份马蔺体内阳离子含量变动很大．在6月以后，随着马蔺的生长，Na^＋、K^＋、Ca^2＋、Mg^2＋4种离子在植物体内累积量逐渐增加．其中，根中Ca^2＋、Na^＋含量峰值出现在7月，分别为2．30％和0．51％。K^＋、Mg^2＋的含量峰值分别出现在9、10月，分别为0．27％和0．28％；叶片中Na’含量在7月达到最大值（0．57％）；K^＋、Ca^2＋和Mg^2＋在8月分别达到1．30％、2．69％和0．47％．与Na^＋相比，7、8月时马蔺对K^＋的选择吸收能力较低，但转运能力较强．马蔺对所测离子有很强的富集能力，各种离子在植物体内的含量都明显高于土壤背景值，且不同部位对离子的利用和累积能力不同，马蔺对各阳离子的累积主要集中在地上30cm到地下40cm范围内．马蔺地上部分平均单株Na^＋、K^＋、Ca^2＋、Mg^2＋含量分别是地下部分的9．11、4．07、0．98和2．27倍．

英文摘要：

The study on the monthly absorption, transportation, and distribution of Na^＋,K^＋,Ca^2＋ and Mg^2＋ in Iris lactea under saline-alkali field conditions showed that the contents of test cations in L lactea varied with months. After June, the cations contents in plant increased with growth. Root Ca^2＋ and Na^＋ contents were the highest in July, being 2.30% and 0. 51% , respectively, while root K^＋ and Mg^2＋ contents were the highest in September （0.27%） and October （0. 28% ）, respectively. Leaf Na^＋ content was the highest in July （0.57%）, while leaf K^＋ , Ca^2＋ and Mg^2＋ contents were the highest in August, being 1.30% , 2. 69% and 0. 47% , respectively. In July and August, the selective absorption （SA） of K^＋ was higher than that of Na^＋ , while the selective transport （ST） was in adverse. The cations contents in L lactea were significantly higher than those in soil, suggesting that I. lactea had high accumulation capacity to these cations. The cations were mainly accumulated in the 0-30 cm aboveground part and 0-40 cm underground part of L lactea, and the average contents of Na^＋, K^＋ , Ca^2＋ and Mg^2＋ in aboveground part were 9. 11, 4. 07, 0. 98 and 2. 27 times of those in underground part, respectively.