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在北京海淀区选５种不同农业利用方式的农田，测定０～２．５ｍ深剖面ＮＨ＿４￣＋和ＮＯ＿３￣－。结果表明，由于各地块的土壤状况、耕作管理方式和施肥水平很不相同，水稻田以ＮＨ＿４￣＋－Ｎ为多，呈金字塔形分布；水稻田改种的菜地，ＮＨ＿４￣＋－Ｎ和ＮＯ＿３￣－－Ｎ含量相近，呈金字塔形分布；小麦、玉米农田与菜田相似，以ＮＯ＿３￣－－Ｎ为主，呈倒金字塔形分布；撂荒地以ＮＯ＿３－Ｎ为主，呈纺锤形分布。
Five fields of farmland with different agricultural uses were selected in Haidian District of Beijing to determine NH_4 ~ + and NO_3 ~ - of 0 ~ 2.5m deep section. The results showed that due to the very different soil conditions, management practices and fertilization levels in different plots, the distribution of NH_4 ~ + -N in the paddy field was mostly pyramidal. In paddy fields, And NO_3 ~ - N content is similar, showing a pyramid-shaped distribution; wheat, corn fields and vegetable fields similar to NO_3 ~ - N-based pyramid-shaped distribution was inverted; wasteland to NO_3-N-based spindle was spindle distributed.