降雨与施肥对夏玉米土壤硝态氮分布影响的田间试验研究

通过在北京顺义区进行模拟降雨田间试验,研究了不同降雨与施肥水平对夏玉米土壤硝态氮分布与累积的影响。结果表明,当土壤质地相同时,土壤硝态氮含量与降雨强度、施氮量关系密切,土壤中硝态氮浓度变化随降雨强度的增加而增大,当降雨强度达到40~70 mm/h时,硝态氮会淋溶到土壤剖面110 cm以下;随着施氮量增加,各层土壤硝态氮含量也均呈升高的趋势,并向下层土壤快速移动,造成对浅层地下水的污染。

Impact of Different Rainfall and Fertilization Conditions on the Distribution of Soil Nitrate in Maize Field

Carried out by simulated rainfall field experiment to study the different levels of rainfall and fertilization on soil nitrate distribution of maize,the cumulative amount of impact in Shunyi,Beijing.The results showed that when soil texture are the same soil nitrate-N concentration and intensity of rainfall,the amount of nitrogen,nitrate-N concentration increases with increasing rainfall intensity;When the rainfall intensity reached 40 to 70 mm/h,the nitrate leaching into the soil profile will be below 110 cm;With the nitrogen application rate increased,levels of soil nitrate content also are on the rise,the lower the soil to the fast-moving,resulting in the pollution of shallow groundwater.