稻鱼共作对养殖池塘沉积物-水界面微观剖面理化性质的影响

采用微电极系统研究了黄颡鱼-水稻共作和黄颡鱼单养两种模式下沉积物-水界面基本理化性质的变化。研究结果表明,与黄颡鱼单养相比,黄颡鱼-水稻共作可使沉积物-水界面附近O2浓度下降速率减慢,O2渗透深度增加71.4%,并使界面Eh值升高,改善塘底沉积物-水界面厌氧状况;黄颡鱼-水稻共作降低了界面附近pH值,比黄颡鱼单养低约一个单位。以上研究结果表明,养殖池塘种植水稻改变了沉积物-水界面的微环境,可能会影响界面物质迁移转化过程。

Impacts of Rice Fish Co culture on the Physical and Chemical Variables of the Microprofiles at Sediments Water Interface in an Intensive culture Pond

An experiment was carried out to investigate the physical and chemical variables in sediment water interface of yellow catfish pond with and without rice planting. The results showed that rice fish co cultures slowed down the decrease of O2 concentration around the sediment water interface, and increase the O2 penetration depths by 71.4%, comparing with fish monoculture pond. Additionally, rice fish co culture increased the Eh value, and improved the aerobic condition in the sediment of pond. Rice fish co culture also decreased the pH around sediment water interface. The pH of rice fish co culture pond was lower than that of monoculture pond by one unit. These results indicated that rice growing changed the mocroenvironment of the sediment water interface of fish pond, which may affect the migration and transformation of elements around this interface.