不同粒级浮游植物对淡水初级生产力的作用

The contribution of algal picoplankton to phytoplankton biomasses and primary production in freshwater bodies in Dalian

用黑白瓶测氧法 ,研究了大连市 3个水体 (植物园、儿童公园、马栏河 )不同粒级浮游植物 ( <2 0 0 μm、 <2 0 μm、 <2 μm )对水体生物量和初级生产力的作用。结果表明 :3水体的营养状况植物园是中营养型 ,绿藻占优势 ;儿童公园和马栏河是富营养型 ,分别以绿藻和硅藻占优势。随着水体富营养化增强 ,超微藻类对浮游植物生物量和初级生产力的作用减小。 3个水体中 <2 0 μm的微型藻类和超微藻类对水体的初级生产力和生物量贡献最大 ,其初级生产力分别占各自总初级生产力的 5 3 7%、 5 7 2 %、 63 2 %。文中与其他作者关于海洋、淡水超微藻类的研究结果进行了比较。

Primary production, biomasses and chlorophyll a level of size fractionated phytoplankton (<200 μm,<20 μm,<2 μm) were estimated in the water bodies (Botanical Garden, Children's Park, Malan River) with different nutrition. Water bodies in both Children's Garden and Malan River were found to be eutrophic lakes, dominated in green algae and diatom, respectively. In the case of Botanical Garden it was meso trophic lake, dominated in green algae. The contribution of algal picoplankton to biomasses and primary production decreased with the increasing of eutrophiction. The results showed that the planktonic algae less than 20μm in size were important in the biomasses and the production in the three water bodies. The ratio of the production of planktonic less than 20μm to the total production of phytoplankton was 53.7% in Botanical Garden, 57.2% in Children's Park and \{63.2%\} in Malan River. The comparison of the present results with others were carried out.