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东湖富营养化成因分析和治理对策
1989年5-10月各围隔中和周围湖水中浮游植物总量、蓝藻生物量和鞭毛藻生物量变动情况 Changes in the biomass of total phytoplankton, cyanobacteria and flagellates in the enclosures and the surrounding lake water in the Donghu Lake during May-Oct. 1989 (after Shei and Liu, 1991) The fluctuation of chlorophyll-a content and the biovolume of the total phytoplankton in the three enclosures was similar in pattern, but in the fish-free #7, the values were much higher than in the enclosures stocked with fish and in the ambient lake-water. The introduction of fish brought about marked changes not only in the biovolume of total phytoplankton, but also in the composition of the dominant group. In the enclosures stocked with fish, the proportion of Cyanophyceae was meager. In the enclosures without fish, large colony-forming Microcystis was predominant (Shei and Liu, 1991). 三个围隔中叶绿素a的含量和浮游植物总体积的波动情况相似,但在无鱼的 #7中,数值要比有鱼的围隔和周围湖水中高的多,鱼的引入,不仅给浮游植物的总体积而且对优势类群的组成带来了明显的改变。养了鱼的围隔中,蓝藻的比例很小,没有鱼的围隔,微囊藻属(Microcystis)的大型群体独占优势 (Shei and Liu,1991) Experiment in the summer of 1990 The purpose of this experiment was: 1) to restore water-bloom in more of the enclosures; 2) to introduce silver carp and big-head carp into those enclosures covered already with water-bloom, to see if the bloom can be consumed by the fish; 3) to monitor the change in the size structure of phytoplankton community in enclosures after the introduction of fish. 1990年夏季的实验 目的: 1)使更多的围隔里重现水华; 2)在水华已覆盖水面的围隔里引进鲢和鳙,看水华能否被鱼吃掉; 3)监测围隔中引入鱼以后浮游植物群落在大小结构方面的变化。 #1 Silver carp, 6 (average body weight 148 g), total stocking density 71 g/m3 #2 Big-head carp, 6 (average weight 176 g), total stocking density 64.5 g/m3 #3 Silver carp, 4 (average 21g), big-head carp, 2 (average weight 32 g), total stocking density 12 g/m3 #4 Silver carp, 4 (average 23 g), big-head carp 2 (average weight 32 g). total stocking density 13 g/m3 #5 Silver carp, 3 (average 152 g), big-head carp,3 (average weight 172g), total stocking density 78 g/m3 #6 No fish 用了6个围隔,围隔的位置和大小与198
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