松嫩平原羊草和虎尾草生物量及钠钾元素季节性变化的研究

Study on Seasonal Dynamic of Biomass and Sodium and Kalium Element of Leymus chinensis and Cnloris vigata in Songnen Plain

分析了松嫩平原西部盐碱地区羊草(Leymus chinensis)群落、虎尾草(Cnloris vigata)群落干物质积累速率、生物量的季节性变化以及钠钾元素在植物体中的分布特征及季节动态。结果表明,羊草和虎尾草的干物质积累速率呈现单峰式曲线变化。羊草地上地下钠元素含量在生长季节内呈单峰曲线变化,地上部钾元素含量与地上部钠元素有相反的变化趋势;虎尾草地上地下钠元素含量在生长季节内呈递减趋势,地上部钾元素含量与钠元素有相同的变化趋势;虎尾草的钠元素含量明显高于羊草;虎尾草植株地上部对Na+和K+的吸收和选择性都高于羊草。图5,表1,参7。

The dry matter accumulation, seasonal dynamic biomass and distribution characteristics and seasonal dynamic of sodium and kalium element in the west alkaline district of Songnen plain are analyzed in this paper. The results showed that dry matter accumulation of Leymus chinensis and Cnloris vigata are single peak type. The seasonal sodium element of Leymus chinensis is single peak type. Variation of kalium element on aboveground parts has opposite direction to the sodium .element on aboveground parts. Sodium element on aboveground parts and roots of Cnloris vigata is descending in season. Kalium element on aboveground parts has the same variation to Sodium element. Sodium element of Cnloris vigata is evidently higher than that of Leymus chinensis.Uptake and selectivity to Na^＋ and K^＋ of Cnloris vigata on aboveground parts are all higher than that of Leymus chinensis.