Abstract: The distribution characteristics and seasonal dynamics of sodium element in the plant and soil of the A.chinense community and the C.virgata community in Songnen plain are analysed in this paper.The results showed that the contents of sodium in the plant of A.chinese are lower than that of C.virgata, the contents of sodium in the above ground parts of the plants are higher than that of underground parts.The contents of soluble and exchangeable sodium are higher in spring and autumn, and lower in summer in both community soils.The highest contents of soluble sodium in the two community soils surface are 5.09, 7.61 cmol.kg^-1 respectively.The vertical distributions of the two community soils are both higher at the top and lower at the bottom, the sodium cotents of the C.virgata community are higher than that of the A.chinense community in each soil layer (0-20, 20-50, 50-70cm).Seasonal changes of the total sodium contents in both plants are single peak type, and have a significant linear relationship with the biomass.

Key words: A.chinense community, C.virgata community, Contents of sodium

摘要： 本文分析了松嫩平原羊草(Aneurolepidium chinense)群落、虎尾草(Chloris virgata)群落钠元素在植物体及土壤中的分布特征及季节动态。结果表明,虎尾草体内钠含量明显高于羊草,两种植物地上部钠含量均高个地下部。两群落土壤水溶性、交换性钠含量均为春、秋季较高,夏季较低。表层土壤水溶性钠最高含量分别为5.09和7.61cmol·kg^-1,交换性钠含量分别为7.33和13.21cmol·kg^-1,垂直分布均为上高下低,虎尾草群落土壤各层的含量均高于羊草群落。羊草、虎尾草体内钠贮量变化均呈单峰型,与生物量呈极显著直线相关。

关键词: 羊草群落, 虎尾草群落, 钠含量