This paper analyses the spatio-temporal variation of nitric nitrogen in the greenhouse soil in different years of cultivation in Qinghai, and determines that the content of nitric nitrogen in 0 ～ 100 cm layer and the fundamental property in 0 ～ 20 cm layer of protected vegetable soils varied obviously in different years of cultivation. Along with the years of cultivation from 2 ～ 27 a, the content of nitric nitrogen in greenhouse soils ranged from 99.09 ～ 609.065 mg/kg in 0 ～ 100 cm layer and 37.51 ～ 545.545 mg/kg in 0 ～ 20 cm layer. The pH value was dropped (8.1 ～ 7.7) by cultivated years while content of salt was increased (0.137％ ～ 0.671％ ). The content of nitric nitrogen in greenhouse soil rend to increase along with the years of cultivation, peaked at 22 a(609.065 mg/kg). The nitric nitrogen accumulation was obvious on top soil. The spatio-temporal variation of nitric nitrogen in protected vegetable soils in different years of cultivation is obvious.%本研究旨在通过对青海乐都地区不同种植年限蔬菜大棚土壤情况的调查,了解该地设施蔬菜生产中土壤硝态氟时空变异.2～27 a设施蔬菜0～100 cm土壤中硝态氮含量为99.09～609.065 mg/kg;0～20 cm土壤中硝态氮含量为37.51～545.545 mg/kg,总盐含量为0.137%～0.671%,pH变化为8.1～7.7;随土壤硝态氮含量的增加,土壤总盐呈增加趋势,土壤pH值则逐渐下降;土壤硝态氮含量随种植年限的增加呈现递增趋势,22 a棚龄的大棚土壤硝态氮含量最高,达609.065 mg/kg;各棚龄土壤硝态氮均表现出明显的表土累积现象.不同种植年限蔬菜大棚土壤中硝态氮时空变异显著.
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