不同土壤盐分条件下新疆杨可溶性盐离子含量变化的研究  

Study on the soluble salt ions contents of Populus alba L.var. pyramidalis growing in salinity soils

作　　者：刘静[1] 王林和[1] 张芳[1] 吕景华 

机构地区：[1]内蒙古农业大学,呼和浩特010019 [2]呼和浩特市气象局,呼和浩特010000

出　　处：《中国生态农业学报》2005年第4期110-115,共6页Chinese Journal of Eco-Agriculture

基　　金："十五"内蒙古自治区科技攻关项目(20020705)资助

摘　　要：对2种含盐量土壤条件下新疆杨可溶性盐离子含量的研究结果表明,退水渠土壤各盐离子含量均高于灌渠土壤,且二者除HCO3-和K+外,其余盐离子含量差异显著;但2种含盐量土壤同龄新疆杨地上部可溶性盐离子含量差异不显著,仅根内Cl-、Mg2+、Na+和K+含量差异显著,说明新疆杨对土壤中较高浓度盐离子有一定排斥作用,并将对树木产生毒害的Cl-、Na+控制在根系中,限制其向地上部输送;新疆杨根系对SO24-和Ca2+有较强的选择吸收性,并将过多的SO2-和Ca2+排除其体外,而对Cl-、Mg2+和Na+的选择吸收性较小。The soluble salt ions contents of Populus alba L. var. pyramidalis growing in two kinds of salinity soil were studied. The results show that the soluble salt ion contents in the soil of waste canal are higher than those of irrigation canal,and there is significant difference between them except HCO3^- and K^＋. But the differences in soluble salt ion contents are indistinctive in the parts of the trees above the ground growing at the same age in the two kinds of soil. There are obvious differences in the contents of Cl^- , Mg^2 ＋, Na^＋ and K ^＋ in the roots of Populus alba L. var. pyramidalis. These demonstrate that the tree has certain repellent function to higher salt ions in the soil. Populus alba L. var. pyramidalis is able to control Cl^- and Na^＋ that bring poison to the tree in the roots and restricts them from getting into leaves, branch and trunk. The roots have strong selective absorbability to SO4^-2 and Ca^2 ＋ and can remove surplus SO4^2- and Ca^2 ＋ out of the body. The roots of the tree have weak selective absorbability to Cl^-,Mg^2＋ and Na^＋.

关 键 词：新疆杨 可溶性盐离子 土壤含盐量 可溶性盐 含量变化 盐离子 土壤盐 SO4^2- MG^2+ CA^2+ 

分 类 号：S792.11[农业科学—林木遗传育种] TQ132.34[农业科学—林学]