利用室内模拟降雨试验,研究了在坡面施入硝酸铵对土壤矿质氮素随地表径流流失和入渗的影响,初步探讨了降雨-地表径流-土壤矿质氮素的有效作用深度(Effective Depth of Interaction,EDI),分别用反推法和拐点法确定了不施肥试验和施肥试验时的土壤矿质氮素EDI。结果表明:①与不施肥相比,施肥增加了土壤矿质氮素的地表流失量,施25,50和100 g NH4NO3处理矿质氮分别多流失了55.22,73.32和85.50 mg/m2;②施肥使土壤肥料的入渗量增加,但对肥料的入渗深度和土壤矿质氮素EDI影响很小;③同一坡面不同坡位NO3--N的EDI值不同,表现为坡中下部较大,坡顶部和坡底部均较小。避免在雨季大量表施速效氮肥,是减少矿质氮流失的关键。
其他摘要
According to the results of simulated runoff experiments,the soil nitrogen transport affected by applying NH4NO3 on the loess slope are studied.Meanwhile,the effective depth of interaction(EDI) of runoff with soil mineral nitrogen is analyzed,and the methods to confirm EDI of both NH4NO3-applied experiments and no-NH4NO3-applied ones are recommended.The results are as follows.①There is no evident influence of the same type of fertilization on soil erosion.But it has a great impact on the amount of soil mine...
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