松嫩平原羊草、虎尾草群落钙元素时空分布的比较研究

本文分析了松嫩平原羊草（Ｌｅｙｍｕｓｃｈｉｎｅｎｓｉｓ）群落和虎尾草（Ｃｈｌｏｒｉｓｖｉｒｇａｔａ）群落钙元素在土壤中和植物体中的分布特征及季节动态，以及土壤中钠钙含量的关系。结果表明，两种群落的土壤水溶性和交换性钙含量均为春秋两季较高，夏季较低，优势种植物体中钙的含量为羊草明显高于虎尾草，根部均高于其它部位。两种群落土壤中交换性钙的垂直分布均以表层最低，并随着土层深度而逐渐增加，其中羊草群落各土层的含量均高于虎尾草群落。

COMPARATIVE STUDIES ON THE TEMPORAL AND SPATIAL DISTR IBUTION OF CALCIUM IN LEYMUS CHINENSIS COMMUNITY AND CHLORIS VIRGATA COMMUNITY IN THE SONG NEN PLAIN CHINA

This paper analyzed distribution characteristics and seasonal dynamics of calcium in plants and soils in a Leymus chinensis community and a Chloris virgata community in the Song nen Plain,China.The results showed that the content of calcium in the organs of L.chinensis Was higher than that of C.virgata ,and for both plant species the content of calcium in roots was higher than that in other organs .In both of the L.chinensis community and the C. virgata community,the content of soluble and exchangeable calcium was higher in spring and autumn,and lower in summer.The exchangeable calcium content was the highest in the surface soils,and got lower at deeper soil layers in the two communities.At any layer of soil the content was always higher in the L.chinensis community than in the C.virgata community.