Abstract:

Rural water environment is an important part of water environment. The Poyang Lake basin is an important area of agricultural production. Because of disorder emissions of untreated Sewage, garbage and solid waste, dispersed livestock pollution, water quality deteriorates and the eutrophication index increases in the Poyang Lake basin. By using pollutants equivalent algorithm, rural area pollutions were estimated and trends were analyzed from 1991 to 2011. On the basis, the trends and impact factors of water quality were analyzed in Poyang lake basin. The results showed that from 1991 to 2011, the rural area pollutions increased in the Poyang Lake Basin. TN, TP and COD emissions from rural sewage grew 1268% respectively, and the average annual growth rates were 3 600 tons, 200 tons, 1681 tons and 2 100 tons. TN and TP emissions from solid waste emissions increased by 1268%, and the average annual growth rates were 36 200 tons, 7 600 tons and 8 000 tons. TN, TP and COD from dispersed livestock pollution increased by 9913%, 6384% and 7227% respectively, and the average annual growth rates were 2 200 tons, 300 tons and 900 tons. Since 2000, the water quality declined in Poyang Lake basin and the trends of the water quality and eutrophication index declined significantly in 001 and 005 levels. Rural living area pollution had a certain influence on the water quality in Poyang Lake basin, and dispersed livestock pollution was relatively large