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为了研究有机肥和双氰胺应用对土壤NH3和N2O的排放会对环境产生的不良影响,试验采用静态箱方法,分4个处理[不施肥、表层施用、深层施用、深层施用+双氰胺(DCD)],研究有机肥施用技术以及添加硝化抑制剂DCD对土壤NH3和N2O排放量以及土壤氮含量的影响。结果表明:施用有机肥后,NH3的排放量会迅速下降,N2O排放量呈现先升高后降低的趋势;与深层施用相比,表面施用有机肥增加了0.91 kg/hm2的NH3-N累计排放量,降低了0.34 kg/hm2的N2O-N累计排放量;使用DCD对降低气体排放无显著影响,但是使用DCD分别减少了0.04 kg/hm2和0.12 kg/hm2的NH3-N和N2O-N累计排放量。表层施用、深层施用和深层施用+DCD的处理组土壤中总无机氮含量比不施肥处理组分别增加了14.47,27.17,22.87 mg/kg,深层施用与对照组之间差异显著(P<0.05)。说明深层施用可以减少氮排放,DCD的使用对氮排放无显著影响;因此,在施用有机肥时,应采用深层施用的方法。
In order to study the adverse effect of organic fertilizer and dicyandiamide application on the soil NH3 and N2O emissions on the environment, the static box method was used in the experiment, which was divided into four treatments [no fertilization, surface application, deep application, deep application + dicyandiamide (DCD)] to study the effects of organic manure application technology and the addition of nitrification inhibitor DCD on soil NH3 and N2O emissions and soil nitrogen content. The results showed that the NH3 emission decreased rapidly and the N2O emission increased firstly and then decreased with the application of organic fertilizer. Compared with the deep application, the surface organic fertilizer increased the cumulative NH3-N emission by 0.91 kg / hm2 , Which reduced the cumulative N2O-N emissions of 0.34 kg / hm2; using DCD had no significant effect on reducing gas emissions, but using DCD reduced the cumulative NH3-N and N2O-N by 0.04 kg / hm2 and 0.12 kg / hm2, respectively Emissions. The content of total inorganic nitrogen in soil increased by 14.47,27.17,22.87 mg / kg compared with that of the non-fertilization treatment, and the difference between the deep application and the control group was significant (P <0.05) . This shows that deep application can reduce nitrogen emission, and the use of DCD has no significant effect on nitrogen emission; therefore, deep application should be used when applying organic fertilizer.