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Eutrophication Evaluation and Plankton Distrubution Research of Hedi Reservoir

Author: LiHongQiu
Tutor: XiePing；ZhengDaoXian
School: Wuhan University
Course: Hydrology and Water Resources
Keywords: Reservoir Eutrophication Phytoplankton Distributed
CLC: X524
Type: Master's thesis
Year: 2004
Downloads: 311
Quote: 2
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Abstract


Western Guangdong coastal areas is the most concentrated areas of Guangdong Province agriculture, water resources are relatively scarce. The Hedi Reservoir is the largest reservoir in the region, has played a major role in to solve local industrial and agricultural and urban water. In recent years, due to the protection of water resources and economic development are incompatible, the water resources in the region increasingly industrial wastewater, sewage and chemical fertilizers, pesticides, farming, pollution, Hedi Reservoir gradually increase the degree of contamination, for Hedi Reservoir carry out Eutrophication Investigation and environmental capacity study has practical significance. In February 2003, July, September and December of Hedi Reservoir the inlet (North) to five samples Dam (South) conducted a survey. The main survey Hedi Reservoir water supply and watershed pollution situation, flow, rainfall, water temperature and transparency of physical indicators and total nitrogen, total phosphorus, ammonia, nitrate, nitrite nitrogen and other nutrients indicators as well as type of phytoplankton and abundance and other biological indicators. By analyzing these data, this paper studied the physical factor features the Hedi Reservoir is not the same point, horizontal distribution and seasonal distribution pattern of nutrients, phytoplankton species composition, abundance distribution of the dominant species, and biodiversity indicators. Also TSI eutrophication indicators eutrophication evaluation of the water quality of the of the Hedi Reservoir different season and sites. Finally, the proposed recommendations for the prevention and control of eutrophication. The research results show that the the Hedi Reservoir rainfall and artificial regulation of the water level will affect the distribution of nutrients and phytoplankton. The rainfall and transparency hyperbolic relationship. Overall higher level of nutrients, a longitudinal gradient distribution from the inlet to the dam, but the seasonal distribution is not obvious, mainly associated with the level of nutrients in runoff of precipitation and the inlet. The Hedi Reservoir total of 88 phytoplankton species, main dominant species Cyanophyta Microcystis and the false Anabaena and diatom Cyclotella door Melosira. Phytoplankton abundance and chlorophyll concentration in the summer and higher in the autumn, winter and spring low. Phytoplankton abundance and chlorophyll concentrations were decreased from the inlet to the dam. Phytoplankton cell density and chlorophyll a concentration showed higher hyperbolic correlation with transparency. But no obvious correlation between the the Hedi Reservoir nutrient concentrations and phytoplankton abundance. Eutrophication Assessment results show the Hedi Reservoir mesotrophic part of the summer and autumn samples up to eutrophic. Higher eutrophication in the fall and summer, winter and spring eutrophication.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control > Lakes and reservoirs
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