Abundance was highest in autumn and summer, and lowest in winter. There was significant difference among seasons ( One-Way ANOVA, p0.01). Seasonal variation of abundance of Turbellaria and Tardigrada was the same as total meiofauna abundance. 小型底栖生物总丰度在季节之间差异显著(One-wayAnova,p0.01).涡虫、缓步动物丰度的季节变化规律与小型底栖动物总丰度相同,水螅、轮虫的丰度也是秋季最高。