土壤含水量、pH及有机质对DMPP硝化抑制效果的影响

Inhibitory effect of DMPP on soil nitrification as affected by soil moisture content,pH and organic matter

采用室内模拟培养试验方法,研究了土壤含水量(40%、60%和80%田间最大持水量)、pH(4、7、10)及有机质(原土和去除有机质)对3,4-二甲基吡唑磷酸盐(DMPP)在潮棕壤中硝化抑制效果的影响.结果表明:随土壤含水量的降低,DMPP的降解趋于缓慢,硝化抑制效应增强.不同土壤pH处理下,以pH为10的处理硝化抑制效果最好,DMPP的存留量最高,pH为7和4处理硝化抑制效果较低,DMPP存留量较少.去除有机质可延长DMPP的存留时间,显著降低土壤表观硝化率.

A laboratory incubation test with meadow brown soil was conducted to study the inhibitory effect of 3,4-dimethylpyrazole phosphate （DMPP） on soil nitrification as affected by soil moisture content （40%,60% and 80% of the maximum field capacity）,pH （4,7 and 10）,and organic matter （retained and removal）.With the decrease of soil moisture content,the degradation of DMPP in soil tended to slow down,and the oxidation of soil NH4＋ was more inhibited.At pH 10,more DMPP was remained in soil,and had the greatest inhibitory effect;at pH 7 and pH 4,the DMPP was lesser remained,with a smaller inhibitory effect.The removal of organic matter prolonged the remaining time of DMPP in soil,and decreased the apparent soil nitrification rate significantly.