马蔺体内主要阳离子含量月变化及分布  

Monthly dynamics and distribution of major cations in Iris lactea.

作　　者：王咏[1] 郭继勋[1] 崔喜燕[1] 韩德复[1] 

机构地区：[1]东北师范大学草地研究所植被生态教育部重点实验室

出　　处：《应用生态学报》2008年第6期1223-1228,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30570273);东北师范大学自然科学青年基金资助项目(20070502)

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+、Ca2+、Mg2+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+、Ca2+和Mg2+4种离子在植物体内累积量逐渐增加.其中,根中Ca2+、Na+含量峰值出现在7月,分别为2.30%和0.51%,K+、Mg2+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+、Ca2+和Mg2+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K+、Na+、Ca2+和Mg2+含量分别是地下部分的9.11、4.07、0.98和2.27倍.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.

关 键 词：马蔺 阳离子累积 盐碱化土壤 

分 类 号：Q945[生物学—植物学]