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为研究浮床栽培鱼腥草(0、5%、10%和15%种植面积)对吉富罗非鱼养殖池塘的水质净化作用,测定了NH_4+~-N、NO_3~--N、NO_2~--N、TN、TP、CODMn等主要水质指标。结果表明,在同样的试验条件下,7—8月份鱼腥草处理组NO_3~--N下降,与此同时带来了NH_4~+-N(除5%处理组)和NO_2~--N的上升。9月份浮床栽培鱼腥草对5种水质指标的平均去除率在3%~38%之间。5%鱼腥草种植面积适合进行中试。通过鱼腥草的采收,5%鱼腥草处理组叶、根茎的产量分别可达112.4、1619.2 kg/hm~2,且可从养殖水体带走0.38 g/m~2的总氮,0.06 g/m~2的磷元素;同时收获鱼总重和所测生物学指标(除体重)显著高于对照和其他处理组,且对成活率和饵料系数无多大影响。
In order to study the purifying effect of Houttuynia cordata (0, 5%, 10% and 15% acreage) on the water quality of the tilapia culture ponds, the effects of NH_4 + -N, NO_3 ~ --N and NO_2 ~ N, TN, TP, CODMn and other major water quality indicators. The results showed that under the same experimental conditions, NO_3 ~ --N in Houttuynia cordata Thunb. From July to August decreased, at the same time NH_4 ~ + -N (except 5%) and NO_2 ~ - N Rise. In September, the average removal rate of 5 kinds of water quality indicators from floating bed cultivation Houttuynia cordata was between 3% and 38%. 5% Houttuynia cultivation area suitable for pilot. The yield of leaves and rhizomes of 5% Houttuynia cordata could reach 112.4,1619.2 kg / hm ~ 2, respectively, and 0.38 g / m ~ 2 total nitrogen and 0.06 g / m ~ 2. The total weight of fish harvested at the same time and the measured biological indexes (except body weight) were significantly higher than the control and other treatment groups, and had little influence on the survival rate and bait coefficient.