内蒙古12种盐生植物对几种无机离子的吸收及分配特性

摘要

The contents of Na,K and Ca in the root,stem and leaf of Elaeagnus angustifolia,Haloxylon ammodendron,Tamarix ramosissima,Nitraria tangutorum,Reaumuria songarica,Kalidium gracile,kalidium cuspidatum,Salsola passerina,Phragmites australis,Limonium bicolor,Tripolium vulgare and Saliconia europaea were examined.The result showed that Saliconia europaea had the extraordinary ability to accumulate Na.The order of Na contents of all tested species except Elaeagnus angustifolia was leavf ＞ stem and roots,and Na/Ca ＜ 10/1 in roots.The accumulation of Na influenced the uptake of K.Ca was accumulated in roots,which reflected the selective absorption of halophyte.It suggested that Na might be substituted by K in halophyte and the accumulation of Na in roots was controled by the Ca content of root in order to avoid too high content of Na in roots.%以内蒙古中西部12种代表性耐盐植物沙枣等为研究对象,测定了其根茎叶的Na+,K+和Ca2+含量,结果表明:一年生盐角草表现出极高的Na+积累能力,12种盐生植物中除沙枣以外其他11种植物叶内的Na+含量＞茎和根部,根部Na+/Ca2+＜10/1.Na+积累影响了植物对K+的吸收,表现出了Na+和K+间的拮抗作用,Ca2+多集中于根部,反映了耐盐植物对离子的选择吸收能力.