福建省山仔水库和杜塘水库沉积物叶绿素a比较研究

采集了福建省山仔水库和杜塘水库的冬季沉积物，采用显微镜观察和荧光分析方法，对不同深度沉积物叶绿素a的含量以及微藻的丰度进行了分析．研究结果表明，山仔水库沉积物表层叶绿素a含量达到4692ng／g底泥干重，微藻的丰度为33．79×10^6Cells／g底泥干重，其中蓝藻门的丰度为6．77×10^6Cells／g底泥干重；...

A Comparison of Chlorophyll-a in the Sediments of Two Reservoirs in Fujian Province

We studied variations of microalgae biomass （including the abundance of microalgae and the content of Chl. a） in the winter sediments of the Shanzai and the Dutang reservoirs in Fujian prov- ince. The phytoplankton counting measure and fluorescence analysis were used to find out the charac- ter of microalgae accumulated in the sediments of these two different eutrophic reservoirs. Results showed that in the surface sediment of Shanzai reservoir, the content of ehlorophyll-a was 4 692 ng per gram dry sediment, the abundance of mieroalgae was 33.79 ×10^6 Cells per gram of dry sediment and the abundance of cyanobacteria was 6.77 ×10^6 Cells per gram of dry sediment; while in the surface sediment of Dutang reservoir, the content of chlorophyll-a was 2 301 ng per gram dry sediment, the a- bundance of microalgae was 16.5 ×10^6 Cells per gram of dry sediment and the abundance of eyanobac- teria was 8.91 ×10^6Cells per gram of dry sediment. Chl. a content in the surface sediment of Shanzai reservoir was 2 times of that in the surface sediment of Dutang reservoir and the abundance of mieroal- gae was even 2 times. The mieroalgae biomass in the sediments was consistent with the degree of eu-trophication situation, for example, Shanzai reservoir had a higher content of Chl. a and larger mi- croalgae biomass, indicating its higher eutrophication level. The study showed that mieroalgae biomass in sediments can reflect eutrophication state.