上海市奉贤区设施菜地土壤理化性状分析

Analysis on Soil Physical and Chemical Characteristics of Protected Vegetable Fields in Fengxian District of Shanghai City

测定了上海市奉贤区不同年限设施菜田土壤盐分含量、离子组成和肥力状况,并对土壤性状进行了分析。结果表明,棚龄2 a及以上设施大棚的盐分含量、电导率均显著高于1 a大棚,除HCO3-外,七大离子含量均显著提高;设施菜地土壤有酸化趋势,6 a及以上棚龄的设施菜田土壤pH值降至5.87,达到弱酸水平;随设施大棚种植年限增加,土壤有机质、全氮、碱解氮、有效磷含量呈上升趋势,特别是6 a及以上棚龄上升显著。

The soil salt content,ion constitution,fertility status and soil properties of protected vegetable fields with different planting time were analyzed.The results showed that the salt content,EC value and the content of main ions（except HCO3-） increased significantly after planting in protected fields for more than 2 years.The soil possessed a clear acidification tendency,and the pH value of the soils that planted more than 6 years declined to 5.87 which reached the weak acid level.The content of soil organic matter,total N,available N and available P were increased with the planting time,especially those of more than 6 years.