| This study aimed at monitoring and analyzing the physicochemical indices of aquatic water for prawn rearing, as well as nutrients within the soil in sewage disposal trenches, thus selected a higher-place shrimp ponds in Haikou as sampls. The investigation illustrated a cornucopia of results as following: firstly, the pH value, temperature, salinity, and index of dissolved oxygen of the water were appropriate for prawns, in both intermediate and later stages of rearing. Nevertheless, 137% increase of ammonia nitrogen along with 33% increase of COD had been discovered from the intermediate to later stage of rearing. At the meantime, the index of ammonia nitrogen within water was 1.94 times much as the acceptable upper limit value, while the index of COD was 1.17 times as much. Meanwhile, index of nutrients within the soil in sewage disposal trenches was severely more than that was in the background soil, the former was 6-48 times more than the later. Nutrients of soil in deep layer were more than in surface layer. The ratio of C/N of sediment ranged from 2.8 to 16.0, which was conductive to the decomposition of organics thus leading to a high degree of humification. |
