Results demonstrated that nitrate had obvious spatial variation and randomicity in lateral direction and vertical direction of soil profile.

结果表明硝酸盐在水平方向和垂直方向具有明显的空间变异。

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Application of N fertilizer significantly increased the amount of residual nitrate-N, and affected its distribution in the soil profile.

施用氮肥可明显增加土壤硝态氮残留数量，并影响其剖面分布；

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