氮素调控剂对不同类型土壤氮素转化的影响

采用室内培养试验方法，比较了硝化抑制剂双氰胺（DCD）和3,5-二甲基吡唑（DMP）对华北平原两种主要土壤类型潮褐土和潮土中氮素转化的调控效果，并进一步研究了DMP与脲酶抑制剂氢醌（HQ）的配合施用对潮土中氮素转化的影响.结果表明： 在两种供试类型土壤上DMP对尿素氮的硝化抑制作用均强于DCD.与单施尿素相比，在氮素转化高峰时，DMP可使土壤中NH₄⁺-N含量显著提高149.5%～387.2%，NO₃^--N含量降低22.3%～55.3%；同一抑制剂对潮土中氮素转化的调控效应较潮褐土更为明显；与DMP单施相比，DMP和HQ配施表现出明显的对氮素转化的协同抑制效果.

Effects of different nitrogen regulators on nitrogen transformation in different soil types.

Laboratory incubation experiments were conducted to compare the inhibitory effects of dicyandiamide (DCD) and 3,5-dimethylpyrazole (DMP) on nitrification in meadow cinnamon soil and fluvo-aquic soil, the main soil types of North China Plain. The synergistic effect of DMP combined with urease inhibitor hydroquinone (HQ) on nitrogen transformation in fluvo-aquic soil was further studied. The results indicated that, in contrast to DCD, DMP had a stronger inhibitory effect on the nitrification in the two tested soils. In comparison with the treatment without any inhibitor, the soil NH₄⁺-N content in the treatment with DMP increased significantly by 149.5%-387.2% at the peak of nitrogen transformation stage, and the soil NO₃^--N content reduced by 22.3%-55.3%. The inhibitory effects of DCD and DMP in fluvo-aquic soil were both stronger than in meadow-cinnamon soil. In addition, the application of DMP combined with HQ had a significantly synergistic effect on soil nitrogen transformation.