摘要
采用室内培养试验,比较了两种硝化抑制剂3,4-二甲基吡唑磷酸盐(DMPP)和双氰胺(DCD)在4种典型农田土壤(水稻土、潮土、黑土、红壤)中的抑制效果。结果表明,在培养期内土壤pH和NH4+-N呈先上升后下降的趋势,NO3--N和表观硝化率呈逐渐上升的趋势。与单施尿素处理(U)相比,添加硝化抑制剂显著增加了土壤NH4+-N含量,降低了NO3--N含量,表观硝化率表现为U>U+DMPP>U+DCD。在水稻土和潮土中,单施尿素处理的硝化过程到第14天时基本完成,添加硝化抑制剂使硝化过程延长了至少28天。在黑土和红壤中,尤其是在红壤中,硝化过程相对缓慢,施用抑制剂虽然降低了土壤的表观硝化率,但降低的程度低于水稻土和潮土。总之,在推荐用量下10%DCD的硝化抑制效果优于1%DMPP,且这两种抑制剂在不同土壤中的抑制效果不同。
The effects of nitrification inhibitors 3,4-dimethylpyrazole phosphate （DMPP） and dicyandiamide （DCD） on soil nitrogen transformation in different soils was investigated in a lab incubation experiment. The results indicated soil pH and NH4^＋-N concentrations were increased to maximum quickly and then decreased gradually, but NO3^--N concentrations and apparent nitrification rates were increased with the time of incubation in all treatments. The apparent nitrification rates were urea alone〉 1 %DMPP 〉 10%DCD in four types of soil. The application of DMPP and DCD induced nitrification process lag behind at least 28 d in alkaline soils, and resulted in the decreased amounts of NO3^--N in acid soils, especially in red soil, which were relatively less than that in in alkaline soils. In conclusion, 10% DCD was more effective than 1% DMPP, and the effectiveness of the two nitrification inhibitors was different in alkaline soils and acid soils.
出处
《土壤》
CAS
CSCD
北大核心
2014年第2期319-324,共6页
Soils
基金
国家重点基础研究发展计划项目(2007CB109301)资助
