Sampling different planting years (1-30 years) soil in greenhouses from Dapuzi zone of Xining city, analyzing the content of soil salt and nutrients. The results showed that with the increasing of cultivation years, the salt content increased 13. 40% -287. 50% ; pH reducing 10.13% - 1. 27% in contrast with the control, and they have opposite trends; The content of organic matter, total nitrogen and total phosphorus were significantly higher than the control, and the increasing percentage compared with the control area were 11. 31% ~ 145. 24% , 44. 60% - 172.47% , 30.29% ~ 191. 70% respectively; meanwhile, the content of available nitrogen increased 14.07% - 122.28% compared with the control area; The available phosphorus changed fluctuately, the percentage changing compared with control at 21. 88% -218. 75%.%以青海省西宁市城北区大堡子乡日光温室土壤为研究对象,分析了种植年限分别为1年、3～4年、6年、8年、15 ～18年、21年、30年日光温室土壤的盐分和养分含量情况.结果表明:随着日光温室种植年限的增加,盐分含量较对照增加13.40％～ 287.50％,pH值较对照下降10.13％～1.27％,两者呈相反趋势.随着日光温室种植年限的增加,土壤中有机质、全氮、全磷含量明显高于对照,分别较对照增加11.31％ ～ 145.24％、44.60％～172.47％、30.29％～191.70％；碱解氮含量较对照增加14.07％ ～ 122.28％；温室土壤中有效磷含量呈波动变化,波动范围为21.88％ ～218.75％.
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