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Evolution of eutrophication Shishankou


. Table 1 transparency, pH, water temperature and DO changes from 1997 to 2005 the value of the water quality rapid increase in 2007 27 No. 2 Reservoir Fisheries (Total 150) * 75 * See Figure 1 for a Figure 5. Shows the evolution of Shishankou eutrophication speed very quickly. Chlorophyll a by the 1.11mg / L increased to 8.78mg / L,[link widoczny dla zalogowanych], increased by 7.9 times, indicating a sharp increase in the amount of phytoplankton in water. Phosphorus content has been steady increasing trend,[link widoczny dla zalogowanych], from 0.013mg / L up to 0.086mg / L, increased by 6.6 times. Total nitrogen by the 0.551mg / L increased to 1.11mg / L, a minor increase only 2.0 times. COD by the 0.147mg / L increased to 0.304mg / L, BOD by the 2.89mg / L increased to 6.57mg / 1. Chlorophyll a and total phosphorus in which the highest growth, and planktonic algae blooms have very close ties. A ●. 108 642} 0 0E coral canopy Year Figure 1 chlorophyll a content of a ●. 0E education was the year of total phosphorus content in Figure 2,[link widoczny dla zalogowanych], 86. 04002-JO Year Year Figure 3 Changes of total nitrogen content in Figure 4COD 5BOD content in Figure 4 years to discuss the results show that, from 1997 to 2005, the water quality indicators increases rapidly, indicating that the degree of eutrophication Shishankou rapidly increased. Total phosphorus and chlorophyll a content in which the magnitude of increase in the maximum, indicating higher total phosphorus content of the important factors leading to eutrophication. The database does not Rock Hill saliva into the industrial and domestic sewage, a large number of phosphorus are from the upper reaches of farmland, tea and chestnut orchard. In recent years, with the chestnut Xinyangmaojian and the rapid development of industry, the development of a large number of tea and chestnut orchard, the sharp increase in fertilizer application rate, fertilizer is not being used both as the rain washed into the reservoir, leading to nitrogen and phosphorus levels rise high, the water in a very short period of time in from poor nutrition transition to eutrophic. This indicates that there is no case of industrial pollution, agricultural pollution is point source pollution can also lead to eutrophication of water bodies in the short term. To prevent the development of water bodies to eutrophication,[link widoczny dla zalogowanych], eutrophication of water quality for the stone pass the underlying trend, the author recommends the following measures. Pollution sources upstream 4.1 Shishankou tea, Chinese chestnut Park prohibited the use of toxic and harmful pesticides, promotion of scientific use of organic fertilizers and bio-pesticides, pollution-free production of non-standard implementation of tea, chestnut orchard are eliminated. 4.2 Reservoir water treatment, according to Jian-Kang Liu, Institute of Hydrobiology Academy of Sciences proposed that each body of water stocked silver carp bighead carp 1m 50g (co 1500kg/hm) can be controlled effects of Microcystis blooms. Silver carp and bighead carp Shishankou reservoir now stocking less than the standard 1 / 10. Need to increase the amount of silver carp and bighead carp stocking. 4.3 pairs of technical innovation in the water plant water plant to add ozone generator, the use of strong oxidation of ozone damage to the molecular structure of microcystin,[link widoczny dla zalogowanych], thus eliminating its toxicity, the lifting of microcystin on the public health threat.
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