摘要
基于对河北平原区小麦-玉米轮作农田土壤NO-3的观测试验,结合施肥、降雨及土壤性质等因素分析了其运移规律。结果表明,经验施肥灌溉条件下,NO-3深层淋失现象明显,氮肥的利用率较低。土壤NO-3年内变化总体趋势呈正弦"S"状,小麦期整体NO-3质量分数高于玉米期。在玉米期呈现双峰形式,较小峰值(47.75mg/kg)出现在土壤剖面60cm埋深上下,较大峰值(93.72mg/kg)出现在土壤剖面160cm埋深上下。由于土壤NO-3的深层淋移,根层以下土壤剖面NO-3有累积增加趋势,严重威胁地下水环境的安全。
Soil nitrate nitrogen observation experiment was conducted in wheat-corn field to analyze the migration law combined with some factors such as irrigation, rainfall, and soil properties. The results showed that soil nitrate nitrogen deep leached obviously, and the utilization rate of nitrogen fertilizer was low in conventional fertilization pattern. The annual variation tendency of soil nitrate nitrogen was sinusoidal curve and the content of soil nitrate nitrogen in wheat was higher than that in corn. The soil nitrate nitrogen content presented in bimodal form in the corn growth period, with the smaller peak （47.75 mg /kg j appearing in about 60 em of soil profile and the larger peak （93. 72 mg/kg） in about 160 em of soil profile. The content of soil nitrate nitrogen below root layer increased as the result of deep leaching, which threatened groundwater environment greatly.
出处
《灌溉排水学报》
CSCD
北大核心
2014年第1期83-86,共4页
Journal of Irrigation and Drainage
基金
河北省自然科学基金项目(E2011204108)
水利部公益性行业科研专项经费项目(201001037)
关键词
硝态氮
分布规律
田间试验
影响因素
NO3^- - N
distribution rule
field experiment
influence factors
