[Investigation of phytoplankton and assessment of algal diversity on backwater area of Xiaojiang River in Three Gorges Reservoir after its initiate impounding to the water level of 156 m in spring].
The Water Level of Three Gorges Reservoir moved up to 156m at the end of October 2006, which represents Three Gorges Project had begun its primary operation period. In order to realize the actuality of water environment and the variation of phytoplankton community of the backwater area of Xiaojiang River, the author has been observing the nutrition level of the area regularly since the beginning of 2007. Based on the data of the routing monitoring in spring (April) 2007, the algal diversity of five sites on Backwater Area of Xiaojiang River was assessed by the diversity index H, richness index d and evenness index J. The values of H, d and J in sample sites are 1.097 5-1.865 5, 1.324 2-1.860 4, 0.263 2-0.435 9 on April. The trophic levels of the five sites are all meso-eutrophic. The water quality of Quma site is not quite right, and the best one is Huangshi site. The highest value of the cell densities and that of the biomass both appeared at Quma April 8th (8.442 x 10(5) cells/L, 1.887 mg/L). It shows the trend that the Chlorophta and Cyanophyta evolve into dominant taxa of the phytoplankton community in early summer instead of Bacillariophyta and Chlorophta in winter on backwater area of Xiaojiang River.
Guo
Jing-Song
JS
Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400045, China. guo0768@vip.sohu.com
Chen
Jie
J
Li
Zhe
Z
Fang
Fang
F
Zhang
Chao
C
Tian
Guang
G
D044822:Biodiversity; D002681:China; D056890:Eukaryota / Q000145:classification* / Q000254:growth & development; D005068:Eutrophication; D005618:Fresh Water / Q000032:analysis*; D010839:Phytoplankton / Q000145:classification* / Q000254:growth & development; D045483:Rivers; D012621:Seasons