[Influence of cascaded exploitation of small hydropower on phytoplankton in Xiangxi River].
With the five small hydropowers (SHPs) from up- to downstream of Xiangxi River as test objects, this paper studied the influence of SHPs cascaded exploitation on the phytoplankton in the river. The results showed that phytoplankton assemblages were dominated by diatoms, occupying 95.54% of the total number of species. Achnanthes linearis, A. lanceolata var. elliptica and Cocconeis placentula were the most abundant species, with the relative abundance being 23.96%, 18.62% and 12.48%, respectively. The average algal density at 25 sampling sites was 6.29 x 10(5) ind x L(-1), with the maximum of 1.81 x 10(6) ind x L(-1) and the minimum of 2.35 x 10(5) ind x L(-1). Two-way ANOVA indicated that water flow velocity was the main factor affecting the phytoplankton. The establishment of the cascaded SHPs on the river made the habitat of lower reach has a significant difference with the others, resulting in a dramatic change of many parameters including Margalef diversity index, species richness, generic richness, taxonomic composition, and the percentage of diatoms.
Wu
Nai-cheng
NC
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China. wunaicheng@ihb.ac.cn
Tang
Tao
T
Zhou
Shu-chan
SC
Fu
Xiao-cheng
XC
Jiang
Wan-xiang
WX
Li
Feng-qing
FQ
Cai
Qing-hua
QH
D002681:China; D017753:Ecosystem; D004784:Environmental Monitoring; D010839:Phytoplankton / Q000502:physiology*; D011210:Power Plants; D045483:Rivers