麦田处理蟹塘废弃物的能力与氮素污染风险研究

Research on Capacity of Wheat Field to Dispose Crab-pond Waste and Its Nitrogen Pollution Risk

在麦田施用不同水平的蟹塘固体废弃物淤泥和伊乐藻,研究了小麦对淤泥和伊乐藻氮素的消纳吸收能力,并分析了淤泥和伊乐藻施入麦田产生的二次污染风险。结果表明:小麦植株的吸氮量随着淤泥和伊乐藻施用量的增加而增加,但在高施用量下,植株对淤泥和伊乐藻氮素吸收能力持续增加潜力不大;当淤泥和伊乐藻处理的氮素投入量高于562.5kg/hm2时,土壤氮素残留量和损失量会明显增加,会加大对环境的二次污染风险。

The different levels of crab-pond solid waste （silt and elodea） was applied in wheat field, the absorptivity of wheat plants to nitrogen in the silt and elodea was researched, and the secondary nitrogen pollution risk caused by the application of silt and elodea in wheat field was analyzed. The results showed that the nitrogen uptake by wheat plants increased with the increase in the application rate of silt and elodea, but the absorptivity of wheat plants to nitrogen in the silt and elodea could not sustainably in- crease under the condition of high application rate. When the application rate of nitrogen in the silt and elodea was over 562.5 kg/ hm2, the residual quantity and loss of nitrogen in the soil would increase obviously, thus could enlarge the secondary nitrogen pollu- tion risk to the environment.