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比较分析了甘肃中部白银市大田和10 a日光温室不同深度土壤理化性状,以探讨日光温室条件下土壤健康状况和养分变化情况.结果表明:长期使用木质素含量较低的有机肥和特殊的水热环境使温室土壤有机质分解加快,积累量减少,造成土壤缓冲能力降低.大量施肥使温室土壤全量和速效氮磷钾显著增加,表层轻度酸化,肥力水平升高,但可溶性盐分在表层聚集明显,引发土壤次生盐渍化.表层土壤速效氮磷富集,并出现了向下淋溶现象,地下水污染风险增加.建议增施C/N比较高的有机肥和微生物肥料,选择致盐能力弱的化肥品种,以维护土壤健康和蔬菜的安全高效生产.
The physical and chemical characters of soils at different depths in the field of Baiyin in central Gansu province and the 10-day sunlight greenhouse were analyzed to investigate the changes of soil health status and nutrients under daylight greenhouse conditions.The results showed that long-term use of organic fertilizer with low lignin content and special water The thermal environment led to faster decomposition and decomposition of soil organic matter in the greenhouse, which resulted in the decrease of soil buffer capacity. Large amount of fertilization increased total and available N, P and K in the greenhouse soil slightly, slightly increased surface acidity and fertility, but soluble salt accumulation in the surface layer was obvious , Triggering the secondary salinization of soil.The topsoil was quickly available for enrichment of nitrogen and phosphorus and leaching downwards and the risk of groundwater pollution increased.It is suggested to increase the organic fertilizer and microbial fertilizer with higher C / Weak fertilizer varieties to maintain soil health and vegetable safety and efficient production.