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在长期定位施氮试验条件下研究了不同施肥处理的土壤Ｎ素平衡、土壤Ｎ库容量、ＮＨ３挥发量、ＮＯ３Ｎ淋溶量以及Ｎ素循环强度的变化。从５ａ（年）１０茬蔬菜的Ｎ素施入及携出累计量计算，除对照外，Ｎ素平衡强度最高为２６９．６％（Ａ１Ｂ１），最低为４９．４％（Ａ３Ｂ３），平均为１６２．５％。Ｎ素的盈亏量与Ｎ库容量相关显著（ｒ＝０．６５９９）。土壤的ＮＨ３挥发量及ＮＯ３Ｎ淋溶量随施Ｎ量的增加而加大。连续多年施用高量有机肥和Ｎ素化肥条件下，ＮＨ３挥发和ＮＯ３Ｎ淋溶几乎是两条同等重要的Ｎ素损失途径，Ｎ素循环强度高；连续多年施用大量Ｎ素化肥而不施有机肥条件下，ＮＨ３挥发是Ｎ素损失的主要途径，ＮＯ３Ｎ淋溶损失次之，Ｎ素循环强度低；长期不施肥的处理Ｎ素循环强度极低，土壤中Ｎ素严重亏缺。高投入、高输出的高肥菜田Ｎ素损失多，土壤中Ｎ素富集量增多，应控制Ｎ素化肥用量，适当降低Ｎ素循环强度；低投入、低输出的瘠薄菜田需增加有机及无机Ｎ素的投入，增强Ｎ素循环强度，以提高蔬菜产量。
The nitrogen balance, soil N storage, NH3 volatilization, NO3N leaching, and N cycling intensity under different fertilization treatments were studied under long-term fertilization experiment. From the 5a (year) of 10 stubble vegetables N application and carry out the cumulative amount calculated, except for the control, the highest N equilibrium intensity of 269.6% (A1B1), the lowest was 49.4% (A3B3), with an average of 162.5%. N profit and loss of N storage capacity was significant (r = 0.6599 *). Soil NH3 volatilization and NO3-N leaching increased with increasing N amount. Under the conditions of continuous application of high amount of organic fertilizer and N-fertilizer for many years, NH3 volatilization and NO3-N leaching are almost two equally important N-loss pathways with high N-cycle intensity. For many years, applying a large amount of N-fertilizer without application Under the condition of organic manure, NH3 volatilization is the main way of N loss, NO3N leaching loss is the second, N cycle strength is low; long-term non-fertilization treatment N cycle strength is extremely low, N deficiency in soil. High inputs, high output of high-fat vegetable N loss of more N-rich soil increased, N fertilizer should control the amount of N appropriate to reduce the cycle strength; low inputs, low output of barren fields need to increase organic And inorganic N inputs, enhance N cycle strength, in order to improve vegetable production.