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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.
In this study, the effects of nitrification inhibitors dicyandiamide (DCD) and 3,5-dimethylpyrazole (DMP) on nitrogen transformations in two major soils, Effects of DMP and urease inhibitor hydroquinone (HQ) on the transformation of nitrogen in alluvial soil were also studied.The results showed that the nitrification of urea nitrogen by DMP was stronger in the two tested soil types Compared with single urea application, DMP increased the content of NH4 + -N in soil by 149.5% ~ 387.2% and the content of NO3 - N by 22.3% ~ 55.3% The regulation effects of nitrogen transformation in the alluvial soil were more obvious than that of the cinnamon soil. Compared with DMP alone, the combination of DMP and HQ showed a synergistic inhibitory effect on nitrogen transformation.