西南红壤区保护地土壤次生盐渍化状况研究

Study of Condition on Soil Salinization of Protected Farmland in Red Soil of Southwest

为了解西南红壤区保护地土壤的理化性质,以昆明晋宁县的蔬菜大棚种植区为例,研究种植年限分别为1年、3年、5年、7年保护地土壤pH值、有机质、全氮、硝态氮、速效磷、速效钾含量的变化情况,分析结果得出大棚土壤的酸度总体上高于露天蔬菜地,保护地栽培土壤中有机质、全氮、硝态氮、速效磷、速效钾的含量在同一种植年限上,均随土层深度的增加而下降,同一土层上,均随种植年限的增加含量逐渐增加。土壤硝态氮的含量与土壤pH值、有机质含量分别具有显著负相关和正相关关系,即土壤硝态氮的含量随土壤pH值的增大而减小,随土壤有机质含量的增大而增大。

In order to know the physical and chemical properties of protected farmland soil in red soil of Southwest,pH value,organic matter,total N,nitrate nitrogen,available phosphorus,available potassium in the protected vegetable soil with the different years of cultivation （1,3,5,7years） were studied in Jinning county,Kunming City.The results showed that soil acidity in the shed was higher than that of outdoor vegetable soil,the organic matter,total N,nitrate nitrogen,available phosphorus,available potassium contents in the protected farmland decreased with the increase of soil depth in the same year,and rose with the increase of cultivation year in the same soil depth.The nitrate nitrogen contents had a significantly negative correlation and significant correlation with the pH value and organic matter.The contents of soil nitrate nitrogen decreased with soil pH value increasing,and increased with the contents of soil organic matter increasing.