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一、前言水生植物是湖泊营养物质的截留者,草食性鱼类的食料,粘性卵鱼类的产卵基质和其他水生生物栖息、繁殖场所。了解水生植物的种群组成与生物量的变化,有利于湖泊合理放养与资源充分利用。柳叶湖是一个水流交换频率大的调蓄湖,水体中营养盐类丰富,底质肥沃,水浅,透明度大,适于水草生长。该湖已放养20年,受生物因素和环境因素的影响,从1982年到1985年,种群组成发生了较大的变化,种群已趋向单一,苦草成了绝对优势种群。二、调查方法从1982年到1985年间的8月份,我们对柳叶湖水生植物的种群组成、分布、生物量进行了调查。全湖设置了16个断面,71个测站。断面根据水面形状按50—120
I. INTRODUCTION Aquatic plants are trappers for lake nutrients, food for herbivorous fish, spawning substrates for viscous egg fish and other aquatic habitats and breeding sites. Understand the changes of population composition and biomass of aquatic plants is conducive to the rational stocking of lakes and the full utilization of resources. Willow Lake is a water exchange frequency regulation lake, rich nutrients in the water, fertile substrate, shallow water, large transparency, suitable for the growth of aquatic plants. The lake has been stocking for 20 years. Influenced by biological factors and environmental factors, from 1982 to 1985, the population composition changed greatly, the population tended to be single, and the bitter grass became the absolute predominant population. Second, the survey method From 1982 to 1985 in August, we willow Lake Lake aquatic plant population composition, distribution, biomass were investigated. The whole lake set up 16 sections, 71 stations. Section according to the shape of the surface by 50-120