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作 者 ：王咏^1,2;郭继勋¹;崔喜燕¹;韩德复¹

期 刊 ：应用生态学报 2008年 19卷 06期 页码：1223-1228

关键词：马蔺；

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30 cm到地下40 cm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.

Abstract:

The study on the monthly absorption, transportation, and distribution of Na⁺,
K⁺, Ca²⁺and Mg²⁺ in Iris lactea under saline-alkali field conditions showed that the contents of test cations in I. lactea varied with months. After June, the cations contents in plant increased with growth. Root Ca²⁺ and Na⁺ contents were the highest in July, being 2.30% and 0.51%, respectively, while root K⁺ and Mg²⁺ 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⁺, Ca²⁺ and Mg²⁺ 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 I. 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I. lactea, and the average contents of Na⁺, K⁺, Ca²⁺and Mg²⁺ in aboveground part were 9.11, 4.07, 0.98 and 2.27 times of those in underground part, respectively.

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