莫莫格湿地干-湿界面优势植物种群动态分析

Dynamical Analysis of Dominant Plants on the Dry-wet Interface in Momoge Wetland

莫莫格湿地从高河漫滩底端到顶端选取有代表性的植物群落片断作为固定观测样带,并设置6个观测样方,生长季5月、7月、9月3次观测结果表明,小叶章优势种群5月份密度最高达1154-1594株/平方米,7月种群数量下降,9月有所升高;踏头苔草优势种群5-7月份密度在3 414-7 193株/平方米,9月份种群数量大幅度下降;土壤相对含水量低地段小叶章种群相对优势度大,土壤相对含水量高地段踏头苔草种群相对优势度大,局部地段生长季内有相对优势度相互替代过程,莫莫格湿地干-湿界面上小叶章和踏头苔草两个种群可以共存。

In this study, we selected a segment of 50m ×10m typical plant community as a fix test site for vegetation observation in Momoge wetland. Six quadrates, each 1m×1m, were established over ahigh floodplain. The results suggested that the Deyeuxia angustifolia was the most common, with the density of 1154-1594 N/m2 in May, decreased in July and then increased in September. The density of Carextato was 3414-7193N/m2 in May and July, sharply decreased in September. Deyeuxia angustifolia has highly relative dominance in drought soil, while Carex tato has highly relative dominance in moisture soil. Relative dominance altered in one quadrate. Deyeuxia angustifolia and Carex tato showed coexistence on dry-wet interface in Momoge wetland.