Top soils and profile soils (1~100cm) in heliogreenhouses of different planting years (1~30years) were collected in Nianbo town of Ledu county and Dapuzi village of the north district of Xining. The dynamic change of soil organic matter and nitrogen in heliogreenhouses were studied. The results showed that the content of organic matter, total nitrogen and avail-able nitrogen of Heliogreenhouse soil were significantly higher than that of open soil. The lowest values of organic matter, to-tal nitrogen and available nitrogen in heliogreenhouses soils were 1.900g/kg, 0.405g/kg and 19.700 mg/kg higher than that of open soil respectively. The content of NH4+-N were 0.375 1~0.435 1 mg/kg in 1~100 cm soil layer. The content of NO3--N in the surface was very high, while became stable below 60cm. With the increase of cultivation years, the content of NO3--N increased from 0.946 mg/L to 45.400 mg/kg, while the content of NH4+-N changed slowly.%采集青海省西宁市城北区大堡子乡和乐都县碾伯镇种植1～30年日光温室蔬菜地耕层土壤及剖面土壤(1～100 cm),分析了土壤中有机质和氮素含量.结果表明,日光温室耕层土壤有机质、全氮和速效氮含量明显高于露地土壤,其有机质、全氮、速效氮含量最低值比露地(CK)土壤分别增加1.900 g/kg、0.405 g/kg、19.700 mg/kg.随着土层深度的增加,土壤中铵态氮(NH4+ -N)在0.3751～0.4351 mg/kg范围内变化,变化最大幅度为0.0600 mg/L;硝态氮在表层含量极高,60 cm以下硝态氮含量变化趋于稳定.随着种植年限的增加,硝态氮(NO3- -N)含量在0.946～45.400 mg/kg内变化；铵态氮(NH4+-N)含量总体上变化趋势比较平缓.
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