稻田表面流去除鱼塘养殖水中的氮、磷效果试验研究

池塘水质对水产养殖非常重要，本研究的目的在于探索稻田面流净化池塘养殖水质的技术途径。在养殖池塘旁稻田内布置9个小区，进行田间面流试验，取水样进行分析。结果表明：在1．5—6．0m^3／h（相应的平均流速为7．5～30m／h）的水力负荷下，鱼池水经稻田表面流处理后可得到一定净化；N、P的去除率与稻田表面流的流量（流速）有关，随流量增大呈减小趋势；在抽穗一扬花期稻田可有效减少养殖水的氮磷含量，在拔节期一孕穗期可显著减少NOf—N含量，有利改善池塘养殖环境。

Experimental Study on Removal Effect of Nitrogen and Phosphorous in Fishpond Water via Surface Flow in Paddy Field

Water quality in fishpond is important to aquicuhure. The objective of the study is to explore a technological way that surface flow in paddy field is used for purifying aquieulture water from fishpond. 9 plots were arrange in the paddy field a- round fishpond, and used for surface flow experiment, in the process of the experiment water samples were taken for water quality analysis. The results showed that under the hydraulic load of 1.5- 6. 0 m3/h（ mean velocity is 7.5 - 30 m/h） , aquicuhure water from fishpond can be purified to some extent after it is treated by surface flow in paddy field. ; The removal rate of nitrogen（ phos- phorus） is related to hydraulic load of surface flow in paddy field, and it declines with the increase of flow rate or flow velocity; from heading to flowering stage of rice plants, paddy field may effectively reduce nitrogen and phosphorus contained in the aqui- culture water. From jointing to booting stage, it can markedly decrease NO2^- -N in the water, which is advantageous to improve an environment for pond culture.