高位虾池养殖水对沟渠土营养盐的影响

以海口市东营镇高位虾池作为研究靶点,监测及分析养殖水体的理化指标及沟渠土中的营养盐,结果表明:养殖中、后期水体中的pH、水温、盐度、溶解氧都在对虾养殖的适应范围内,但后期的养殖水体与中期相比,氨氮含量增加了137%,COD含量增加了33%,与对虾养殖的适应范围上限值相比,氨氮超标1.94倍,COD超标1.17倍;沟渠土沉积物中的营养盐与背景土中的相比,超标6～48倍,沟渠土沉积物中的营养盐基本为深层含量大于表层含量,但沟渠土沉积物中的C/N比值介于2.8～16.0之间,有利于有机物的分解,腐殖化程度高。

Impact of the aquaculture water of higher-place shrimp ponds on nutrients within the soil within trenchv

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.