研究干旱年际施肥方式对径流淋溶氮磷流失的影响。采用田间模拟法，分析不同施肥方式对北方玉米种植的径流、淋溶的氮磷浓度及流失负荷的影响。结果表明，与常规施肥方式相比，缓控释肥可以降低氮流失负荷 17．5%; 秸秆还田施肥方式可以降低氮磷流失负荷分别为 36%和 23．2%; 而机无机混施施肥方式则可明显降低氮流失 4．9%，但明显提高磷流失 53．3%。径流造成的氮磷流失是面源污染的主要方式。
Abstract
Outdoor stimulation method was conducted to analyze the effect of different fertilization on nitrogen and phosphorus concentration and loss by runoff and leaching in continuous maize cropping system in Northeast China. The results showed compared with farmer conventional fertilization, controlled release fertilizer could decrease 17.5% nitrogen loss; straw returning fertilization could drop 36% nitrogen loss and 23.2% phosphorus loss; however, manure fertilization decreased 4.9% nitrogen loss and remarkably increased 53.3% phosphorus loss. Nitrogen and phosphorus loss by runoff was the main way for non-point pollution.
基金
国家科技支撑计划项目( 2013BAC09B01) ; 国家级大学生创业创新项目( 201610193013)
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