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| Study on calculation of representative aquaculture pollution discharging coefficients in the Taihu Lake basin within Jiangsu Province |
| Received:February 03, 2017 |
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| KeyWord:Taihu Lake basin;aquaculture;discharge coefficient of pollutant;estimation |
| Author Name | Affiliation | E-mail | | GAO Yue-xiang | Nanjing Institute of Environmental Science, Ministry of Environmental Protection, Nanjing 210042, China | | | ZHANG Yi-min | Nanjing Institute of Environmental Science, Ministry of Environmental Protection, Nanjing 210042, China | zym@nies.org | | WANG Wei-min | Nanjing Institute of Environmental Science, Ministry of Environmental Protection, Nanjing 210042, China | | | ZHANG Yong-chun | Nanjing Institute of Environmental Science, Ministry of Environmental Protection, Nanjing 210042, China | |
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| Abstract: |
| In order to reasonably evaluate the influence of aquaculture on the environment,six aquaculture ponds and six purse seines in typical areas of Taihu Lake were selected,with four aquaculture species and two aquaculture patterns (Eriocheir sinensis,grass carp,and Erythroculter ilishaeformis in aquaculture ponds;Eriocheir sinensis,silver carp,and bighead carp in purse seines).The aquaculture pollution discharging coefficients for total nitrogen (TN),total phosphorus (TP),copper (Cu),and zinc (Zn) were quantitatively analyzed by the method of field monitoring and mass balance.The results showed that there were great differences in pollution discharge coefficients among the various species and patterns using the mass balance method.Owing to different complementary fishes,the pollution discharge coefficients also varied widely for the same species under the same aquaculture patterns.In seine breeding Eriocheir sinensis,the range of the other fish intercropping proportion was 30% to 60%,and the averages of pollution discharging coefficients of TN,TP,Cu,and Zn were 16.80,2.80,0.002 0,and 0.026 1 kg·t-1,respectively.Under the circumstance of no or little fish intercropping (the proportion of fish intercropping was less than 10%),the averages of pollution discharging coefficients of TN,TP,Cu,and Zn were 90.03,41.39,0.036 5,and 0.219 8 kg·t-1,respectively.The pollution discharging coefficients for the silver carp and bighead carp in seine breeding had negative values.Furthermore,the pollution discharging coefficients using mass balance measurement were much higher than those using field monitoring in aquaculture ponds.The results could be used to calculate the regional aquaculture pollution load in combination with fishery statistics.Overall,it is necessary to take full advantage of the material circulation relationships between fish,snail,grass,and algae to establish a good ecological breeding mode for the process of aquaculture,which could lead to a win-win for economic and environmental protection purposes. |
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