Abstract:

In order to reveal the effect of the pollutants in the river which flowed into the Fubao Bay，Dianchi Lake on benthic diatom communities，benthic diatom samples of 6 sites in the littoral zone of Fubao Bay were collected in different season，and the diatom community structure including diatoms species composition，cell densities and ShannonWeaver diversity index was investigated.The study found that 〖WTBX〗Achnanthes minutissima〖WTBZ〗 was one of the most abundant species or dominant indicator in the most months during experiment in the east littoral，and the highest relative abundance reached 795%.The 〖WTBX〗Gomphonema〖WTBZ〗 spp.were dominant in the west littoral，and 〖WTBX〗Amphora pediculus〖WTBZ〗 and 〖WTBX〗Nitzschia amphibia〖WTBZ〗 were dominant species in the highly polluted region near the estuary of the bay during January~July，after that，〖WTBX〗Achnanthes minutissima〖WTBZ〗 became gradually the dominator in both water area.The densities of benthic diatoms rose gradually with the increase of the distances between the sampling sites and the estuary.The results showed that the pollutants in the river which flowed into the lake influenced greatly the density and spatialtemporal distribution of benthic diatoms in the lake bay.〖