盐胁迫下不同树龄枸杞各器官的盐离子分布

Salty Ion Distributions in Different Organs of Lycium barbarum L. at Different Ages under Salt Stress

以甘肃景泰沿黄灌区栽植的枸杞（Lycium barbarum L．）为研究对象，研究了盐胁迫下不同树龄枸杞各器官的盐离子分配。结果表明，1～2年生枸杞各器官的K^＋分布为幼叶〉成叶〉嫩茎，而3～4年生枸杞为幼果〉嫩茎〉幼叶〉成叶；1～4年生枸杞成叶的Na^＋含量分别为1．273％、1．414％、0．689％和0．497％；不同年龄枸杞成叶、幼叶、嫩茎和幼果的Na^＋／K^＋平均值分别为2．425％、1．397％、0．489％和0．301％；随枸杞年龄的增加，根对土壤中Na^＋、K^＋的选择吸收比值（SA）逐渐增加。枸杞选择性吸收K^＋、拒Na^＋的特性和分配较多Na^＋、CI^-给耐盐性较强的器官（成叶）是枸杞耐盐的重要原因。

Lyciurn barbarum L. planted in the Yellow River-irrigated area locatea m Jmgtai county of Gansu province was used to study salty ion distributions in different organs of L. barbarurn at different ages. The results showed that K^＋ increased in its distribution in the order of young leaves,adult leaves and young shoots in 1-2-year-old L. barDarum and in the order of young fruits ,young sterms,young leaves and adult leaves in 3-4-year-old L. barbarum;the Na^＋ contents in the adult leaves of L. barbarurn at the ages of 1-4 years were 1. 273%,1. 414%,0. 689% and 0. 497%,respectively;the average Na^＋/K^＋ ratios in the adult leaves, young leaves, young stems and young fruits of L. barbarurn at different ages were 2. 425%, 1.397 %, 0.489% and 0. 301%,respectively;with the age of L. barbarum increasing,its roots increasingly took up soil Na^＋ and K^＋ by selective absorption. The features that L. barbarurn takes up more K^＋ than Na^ by selective absorption and allocates more Na^＋ and Cl^- to the organs （adult leaves） with higher salt-tolerating capacity are the important reasons why L. barbarurn can tolerate salts.