Abstract:

This article analyzed the pollutant source in everglade of Dongting Lake, based on investigate data from hydrological observation station of Dongting Lake, environmental monitor station and spots examine. Results show that: annually input of TN to everglade of Dongting Lake was 670132.47 t, TP was 41103.85 t； COD input was 317849.26 t. The total of heavy metal elements, inorganic and organic contaminations input was 10156.616 t, The 54.76% of N, 44.30% of P, 81.83% of COD and 95.59% of heavy metal elements, which inputed into everglade of Dongting Lake contaminations, was come from Xiang river, Zi river, Yuang river, Li river and three Changjiang river flood input mouth. 94%～99% of contaminations was area polluting resources, point polluting resources only 1%～6%. So it is more imported to control input from out system then control input from everglad circumjacent area, viewed from strategically control contaminations in everglade of Dongting Lake. Control area pollution was more import then control point pollution.