小美旱杨不同部位可溶盐离子含量的季节动态及影响因素

The Variation of Soluble Salt Ions of populus popular's at Different Seasons

对河套灌区小美旱杨(Populus popular’s)防护林叶、一年生枝、根、心材、边材和多年生枝的可溶盐离子含量进行试验研究,主要结论为:各部位无CO32-。各部位可溶盐离子含量的季节动态呈现一定的共性,各个部位的阴离子季节动态相似,均呈现倒峰型;在叶和一年生枝中,Ca2+呈递减趋势,K+和Na+反之;在根、多年生枝、心材和边材中,Ca2+和Mg2+的季节动态呈倒峰型。按可溶盐离子的组成和含量,上述部位分为三类:叶;一年生枝和根;多年生枝、心材和边材。不同部位生理功能不同,离子含量也不同。叶中各离子含量明显高于其他部位,且生长季内变幅明显;多年生枝、心材和边材各离子含量较小,变幅不大;一年生枝和根的离子含量和动态介于以上两者之间。土壤和地下水的水盐动态对各部位的HCO3-、Cl-浓度影响较明显。

The research analyzed the soluble salt ions content roots, heartwood, sapwood and old branches） The results of different parts （ leaves, one- year branches, showed as follows. There was no CO3^2- in any part of the tree. the season variation regularity of soluble salt ions content in different parts was analogical, and negative ions contents were eonverse- singal- apex. Ca^2＋ decreased, K^＋ and Na^＋ increased gradually from April to October, in leaves and one-year branches . In roots.old branches , heartwood and sapwood, the dynamic regularity of Ca^2＋ and Mg^2＋ contents were similar to the negativeions. Different parts could be divided into three type： leaves; one-year branches and roots; old branches, heartwood and sapwood. The ions contents of leaves not only were higher than others＇, but also the mutative extent was obvious in growth season . The ions content were little, moreover the variation was small in old branches ,heartwood and sapwood. One-year branches and roots were between them. HCO3^- and Cl^- in all parts were influenced by the soil and groundwater.