土壤裂缝产生过程中双氢胺对氮溶质运移的影响

Effects of Adding DCD on Nitrogen Solute Transformation in Soil Cracking

模拟稻田土壤在淹水后加入不同量的(NH4)2SO4和双氢胺(DCD)抑制剂的溶液,让土壤自然变干,直至土壤产生裂缝到裂缝稳定的连续培养,在培养第10d后再给土柱复水的6种处理,每天监测各处理渗漏液中铵态氮、硝态氮和亚硝态氮的浓度变化。试验结果表明,肥料(NH4)2SO4和DCD的加入量是10∶1.5和10∶2时,即DCD和肥料(NH4)2SO4施用量的高比例能在裂缝产生过程时较好地抑制铵态氮硝化,整个培养过程没有获得DCD抑制剂对渗漏液中硝态氮和亚硝态氮的影响。裂缝稳定后的复水对渗漏液中的铵态氮没有影响,但是提高了渗漏液中的亚硝态氮和硝态氮的浓度。

The soil columns incubation experiments were conducted to add 5 000 ml solution of different amount of （NH4）2SO4 and DCD to soils, then dried those soils under nature environment in a greenhouse, re-irrigated 5000 ml water to soil column the 10th day later. Through measuring continuous and dynamic change of NH4^＋ , NO3^- and NO2^- in leaching solution, these results showed that when the ration of （NH4）2SO4 ： DCD was 10 ： 1.5 or 10 ： 2, namely, higher ratio of DCD and （NH4）2SO4 could inhibit nitrification of （NH4）2SO4 during the course of cracks producing. There were no significant effects of adding experiments. The rerirrigation increased the concentration of ing solution DCD on NO3^- and NO2^2 in leaching solution in whole NO3^- and NO2^- and had no effects on NH4^＋ in leaching solution.