“空心菜-水芹”轮作对养殖池塘水质和底质环境的影响

The effect of pond pollutants removal for rotation by water spinach(Ipomoea aquatica) and cress(Oenanthe stolonifera)

通过测定TOC、COD、Chl、TN、NH_4^+-N、NO_2^--N、NO_3^--N、TP、PO_4^(3-)-P等水质指标和底泥中TOC、TN、TP指标,探究"空心菜-水芹"轮作模式对不同养殖品种和养殖数量情况下养殖池塘水质和底质环境的影响。结果表明,在轮作模式前期,空心菜(Ipomoea aquatica)种植能显著降低甘露青鱼(Mylopharyngodon piceus)养殖场TOC、Chl、TN、NH_4^+-N、NO_2^--N、NO_3^--N、PO_4^(3-)-P等水质指标,能显著降低苏州经济鱼亲本塘TOC、COD、Chl、NH_4^+-N、NO_2^--N、NO_3^--N、TP等水质指标。轮作后期水芹(Oenanthe stolonifera)种植能降低甘露青鱼养殖场TOC、NO_3^--N、TP等水质指标,降低苏州经济鱼亲本塘TOC、COD、NH_4^+-N、NO_3^--N、TP等水质指标。轮作前、后期均能降低底质TOC、TN和TP含量。"空心菜-水芹"轮作模式能显著降低养殖池塘水体中TOC、NH_4^+-N、NO_3^--N、TP指标和底泥中TOC、TN、TP指标。

The pollutant removal effect towards different cultivation species or quantity on the rotation model by water spinach（Ipomoea aquatica） and cress（Oenanthe stolonifera） has been tested.Contents of the main water quality indexes including total organic carbon（TOC）,chemical oxygen demand（COD）,chlorophyll（Chl）,total nitrogen（TN）,ammonium nitrogen（NH4＋-N）,nitrite nitrogen（NO2--N）,nitrate nitrogen（NO3--N）,total phosphorus（TP） and PO43--P were measured.TOC,TN and TP in the sediments have also been tested.The results showed that TOC,Chl,TN,NH4＋-N,NO2--N,NO3--N and PO43--P significantly decreased in Ganlou herring（Mylopharyngodon piceus） pond before the rotation model（only planting water spinach）,while TOC,COD,Chl,NH4＋-N,NO2--N,NO3--N,TP significantly decreased in Suzhou economic parental fish pond.TOC,NO3--N,TP significantly decreased in Ganlou herring（Mylopharyngodon piceus） pond after the rotation model（only planting cress）,while TOC,COD,NH4＋-N,NO3--N,TP significantly decreased in Suzhou economic parental fish pond.To conclude,TOC,NH4＋-N,NO3--N,TP in the water and TOC,TN,TP in the sediment have been significantly reduced by this rotation model ＂water spinach-cress＂.