模拟强降雨条件下硝态氮在土壤剖面的累积及淋溶研究

目的]为了探讨硝态氮在土壤中累积和淋溶水平。方法]采用野外冬小麦田间试验,选定不同降雨强度和施肥水平,分析土壤不同深度水分含量和硝态氮含量。结果]降雨强度和土壤施肥水平是有效影响土壤氮素在土壤中运移和淋溶的重要因素,表现在:土壤降雨强度越大,施肥水平越高,会造成土壤中主要氮素类型硝态氮明显的流失。此外,土壤质地类型也是造成土壤氮素流失的重要因素,表现为土壤质地砂性越强,其淋溶效果越明显。结论]土壤施肥水平和降雨强度是影响土壤氮素流失的重要因素。

Study on Effects of Nitrate Accumulation in Soil Profile and Leaching Losses under Simulated Rainfall

Objective] The research aimed to study the accumulation and leaching level of nitrate nitrogen in soil profile.Method] Winter wheat planting experiment in the field was carried out to analyze the water content and nitrate concentration under different rainfall intensity and fertilization.Result] The effective rainfall intensity and soil fertilization level affected the migration of soil nitrogen in the soil and leaching.The greater rainfall intensity of soil was,the higher the level of fertilization was.The soil type caused significant loss of nitrogen nitrate.In addition,soil texture types also played an important role in the loss of soil nitrogen.The stronger the soil texture sand was,more obvious its leaching effect was.Conclusion] Soil fertilization level and rainfall intensity had important impacts on soil nitrogen loss.