3.1.3. Pollution intensity calculation of aquacultural ponds
According to the water quality monitoring results, drainage quantity and pattern, pollution intensity of the main water quality index in aquacultural ponds was estimated. The pollution intensity in the present study was also compared with general aquaculture pond in Shanghai. It was found that the intensity of CODCr, TP and TN in this research was 3201 kg/ha, 25.7 kg/ha and 128.6 kg/ha ,respectively, all of which were higher than general aquaculture pond in Shanghai (Xu, 2003).