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[目的]研究砖红壤中施用硝化抑制剂双氰胺(DCD)时,DCD添加量及土壤理化性质如温度、含水量、有机质含量、pH等对硝化抑制效果的影响。[方法]采用室内好气培养方法。[结果]当DCD添加量为10mg/kg(土)时,硝化作用出现明显的延迟期,且抑制效果可持续至少56d。培养温度由10℃升高到30℃,硝化抑制作用持续时间由90d降为30d。DCD的硝化抑制效果随土壤含水量、有机质含量和pH升高而减弱,硝化抑制作用持续时间随土壤含水量、有机质含量和土壤pH降低而延长。[结论]增加施用量,降低土壤温度、含水量、有机质含量和pH值均可增强DCD在砖红壤中的硝化抑制效果。
[Objective] The research aimed to study the effects of DCD dosage, soil physical and chemical properties such as temperature, water content, organic matter content and pH on the nitrification inhibition effect of nitrification inhibitor dicyandiamide (DCD) in brick red soil. [Method] Indoor aerobic culture method was used. [Result] When the dosage of DCD was 10 mg / kg (soil), the nitrification appeared obvious delay period, and the inhibitory effect could last for at least 56 days. The incubation temperature increased from 10 ℃ to 30 ℃, and the duration of nitrification inhibition decreased from 90d to 30d. The nitrification inhibitory effect of DCD was weakened with the increase of soil moisture content, organic matter content and pH, and the duration of nitrification inhibition was prolonged with the decrease of soil water content, organic matter content and soil pH. [Conclusion] Increasing application rate, decreasing soil temperature, water content, organic matter content and pH value all increased the nitrification inhibitory effect of DCD in latosol.