中国地球化学学报（英文版）2006，Vol.25Issue(1)：90-96,7.
Impact of aquaculture on eutrophication in Changshou Reservoir
Impact of aquaculture on eutrophication in Changshou Reservoir
摘要
Abstract
As a result of intensifying human activities around the Changshou Reservoir, water environ mental quality has declined over the years. Water quality had been monitored from 1999 to 2002. The re sult indicated that the concentrations of total nitrogen (TN) and total phosphorus (TP) are high. The con centrations of phosphorus range from 0.037 mg/L to 0. 444 mg/L, exceeding the critical value (0.02 mg/ L) for eutrophication. The concentrations of total nitrogen and chlorophyll a range from 0.70 mg/L to 4.18 mg/L and from 1.10 mg/m3 to 61.2 mg/m3 , respectively. The eutrophication status of the water body was assessed using the method of integrated nutrition state index, which revealed that all sampling sites were eutrophicated from the year of 2001. About 69.6% of the annual total nitrogen input and 26% of the annual total phosphorus input originated from the upstreams. The contributions of nitrogen and phos phorus from precipitation to the water body are very small (0.9% and 0.3%, respectively) owing to their low contents (1.21 mg/L and 0.029 mg/L, respectively). Runoff is the secondarily important input source, which accounts for 19.0% of the total N input and 47.0% of the total P input, respectively. At tention should be paid to the aquaculture inputs, whose contributions account for 10.5% of the total N and 26.6% of the total phosphorus to the water body, respectively. Nutrient loads are estimated to be 118 gNm-2 · a-1 and 8 gPm -2 · a-1 About 69.4% of nitrogen and 79.7% of phosphorus input into the res ervoir were retained in 2002.关键词
aquaculture/eutrophication/Changshou Reservoir/nutrition statusKey words
aquaculture/eutrophication/Changshou Reservoir/nutrition status分类
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..Impact of aquaculture on eutrophication in Changshou Reservoir[J].中国地球化学学报（英文版）,2006,25(1):90-96,7.基金项目
This work was financially supported by the Chongqing Natural Science Foundation and Chongqing Municipal Government ( Nos. 2004BB7075and 2005BB7239) and Sino-Italian Cooperation Project (Survey and Assessment on Ecology in the Three Gorges Area). （ Nos. 2004BB7075and 2005BB7239）
