通过田间采样方法，以不同种植年限的温室和露地表层土壤为研究对象，分析了长期连作蔬菜对温室土壤pH、全盐和硝态氮含量的影响。结果表明，不同种植年限温室菜地土壤(0～20 cm)pH都明显低于露地，且随种植年限的延长pH逐渐降低，pH与种植年限显著负相关，年均降低0.05个单位；土壤全盐含量与种植年限呈显著正相关，年均增加0.18百分点。连续14 a种植蔬菜的温室，土壤已出现轻微的盐渍化现象，土壤全盐含量达到3.4 g/kg，是露地土壤的6.35倍，应考虑采用深翻、覆盖及灌溉排盐等措施控制盐渍化。

The study of the effects of long-term continuous cultivating greenhouse vegetables on pH， total salt and nitrate nitrogen content of top soil (0～20 cm) is carried out through sampling top soil of open field and different cultivating years greenhouse in Wushan county of Tianshui city of Wei River upstream. The result shows that soil pH of different cultivating years greenhouse vegetable field top(0~20 cm) all significantly lower than that of open field， and with the extension of cultivating years， the soil pH declined significantly， moreover， it significantly negatively related with cultivating years，every year declined 0.05 units pH. In contrast，the soil total salt content significantly positively reached related to cultivating years and increased by 0.18 percent point per year. Continuous cultivating greenhouse vegetables for 14 years， soil has mild salinization phenomenon and soil total salt content 3.4 g/kg， equivalent to 6.35 times of the open field salt content. Consideration should be given deep tillage， covering and irrigation drainage salinity and other measures to control soil salinization.

S158.2

国家科技支撑计划课题(2012BAD05B06)；酒钢集团吉瑞再生资源开发有限责任公司项目“酒钢固废农业资源化利用技术研究”；甘肃新民生物科技有限公司项目“果蔬专用骨粉有机肥的研制与应用”