横岗水库富营养化特征分析

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Abstract

The nutrients,chlorophyll a and phytoplankton in the Henggang Reservoir were monitored in May and November,2005.In May,the mean concentration of TN,TP and Chlorophyll a were 3.810 mg·L^-1,0.172 mg·L^-1 and 17.888 mg·m^-3,respectively.Comprehensive Trophic State Index(TSI_M),was 73.3,indicating that the Reservoir was hypertrophic.In November,the mean concentration of TN and TP were 1.302 mg·L^-1 and 0.096 mg·L^-1,respectively.The TSI_M decreased to 55.6,indicating that the Reservoir was lightly eutrophic.However,the mean Chlorophyll a increased to 26.935 mg·m^-3.The increase of chlorophyll a concentration was positively related to NH₃-N and PO₄-P,and changes in phytoplankton community composition.The phytoplankton community was dominated by Cyanophyta in May,but by Chlorophyta in November.In May,the mean cell abundance of phytoplankton was 2.75×10⁸ cells·L^-1.The dominant species were Merismopedia elegans and M.glauca,which composed about 90% of the total phytoplankton.In November,the mean cell abundance of phytoplankton was 1.27×10⁷ cells·L^-1.The dominance of Merismopedia reduced to 14.89% of total phytoplankton cells.Scenedesmus became one of dominant species,which composed 11.52% of total phytoplankton cells.

Key words： Eutrophication Phytoplankton Nutrients Henggang Reservoir

Received: 25 October 2006

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	Articles by authors
	CHEN Mian-run
	OUYANG Hao
	HAN Bo-ping

Cite this article:

CHEN Mian-run,OUYANG Hao,HAN Bo-ping. Analysis on eutrophication characteristics of Henggang reservoir[J]. , 2006, 25(5): 445-449.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2006/V25/I5/445

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