DMPP对稻田田面水氮素转化及流失潜能的影响

Influences of nitrification inhibitor 3,4-dimethylpyrazole phosphate on nitrogen transformation and potential runoff loss in rice fields

采用杭嘉湖地区典型的小粉土和青紫泥土壤,进行水稻盆栽试验,研究新型硝化抑制剂3,4-二甲基吡唑磷酸盐(DMPP)对稻田田面水氮素转化及径流流失潜能的影响.结果表明,小粉土和青紫泥土壤稻田应用添加DMPP抑制剂的尿素,与常规尿素处理相比,田面水中铵态氮的浓度增加24.8%和16.7%,硝态氮浓度降低47.7%和70.9%,亚硝态氮浓度降低90.6%和88.9%,总无机氮浓度下降13.5%与23.1%,能显著减轻农田氮素流失对水环境存在的污染;DMPP可使田面水的电导率下降,降低盐基离子随农田排水或暴雨径流所导致的流失风险,有助于保护河流水体等地表水环境.

In a rice pot incubation experiment, the nitrogen transformation in the rice field surface water and potential nitrogen runoff loss risk were studied by applied urea with new nitrification inhibitor 3,4-dimethyl pyrazole phosphate （DMPP） in the powder soil and blue clayey paddy soil. The results showed that, in the powder soil and blue clayey paddy soil, the ammonium concentration were increased 24.8% and 16.7%, nitrate, nitrite and total inorganic nitrogen concentrations were declined 47.7% and 70.9%, 90.6% and 88.9%, 13.5% and 23.1% in the rice field surface water, respectively. So, the potential nitrogen runoff loss risk could greatly be decreased when the storm or field drainage happened. Furthermore, the electric conductivity value was also declined in the rice field surface water with the DMPP addition in the urea, decreasing the salt-ion runoff loss risk at the storm or field drainage and being beneficial for protecting the water body.