太湖梅梁湾中碱性磷酸酶的活性及其与藻类生长的关系.pptVIP

Outline Bacterial abundance, biomass and production in Lake Taihu Microsystin in Lake Taihu The mean percentage of active bacteria versus total bacterial abundance varied from 34% to 28% in the river mouth, Meiliang Bay and the open lake. Variation of the active cells between sites was smaller than the variation in abundance and biomass. Microsystin in Lake Taihu * * Bacterial production and Microsystin in Lake Taihu GUANG GAO Nanjing Institute of Geography Limnology, CAS 2007.03.26 Meiliang Bay, Lake Taihu Main characteristics of this area: Surface area: 120 Km2 Mean water depth: 1.95 m Mean width: 7.0 Km Mean length: 15.0 Km The river mouth, which was ca. 55% higher than the mean in Meiliang Bay and almost twice as high as the open lake. At river mouth, the total bacterial biomass was 364±225 μg C l-1, i.e. ca. 1.5 and 2.2 times higher than bay and the open lake. The difference between the highest and lowest value was ca. tenfold at the river mouth, only ca. fivefold were in Bay and the open lake. Bacterial abundances and production The relationship between total bacterial abundance and the number of active bacteria The total phosphorus concentration vs the total bacterial abundance (filled circles) or the number of active bacteria (open circles) at different sites of Lake Taihu. The original total phosphorus data were taken from the yearbook of TLLER, CAS. Correlation of bacterial carbon production measured by both [3H]-TdR (filled circles) and [14C]-Leu (open circles) and phytoplankton biomass. ( River mouth, r2 =0.676, n=13, p=0.001 and r2 =0.680, n=13, p=0.001, Meiliang Bay, r2 =0.219, n=39, p=0.003 and r2 =0.235, n=39, p=0.002) The original phytoplankton biomass data were taken from the yearbook of TLLER, CAS. The Chl-a concentration vs the total bacterial abundance (filled circles) or the number of active bacteria (open circles). The original phytoplankton biomass data were