江苏中南部设施蔬菜盐渍化土壤盐分离子含量及其垂直分布调查

摘要

In order to understand the status of salinization of facility vegetable soil,stratified sampling of 0-40 cm soil layer was conducted in typical salinization soil of facilities vegetable producing areas of central and southern Jiangsu Province with 10 cm as a unit,and the adjacent exposed soil outside the greenhouse was taken as control.We determined and analyzed the soil EC value and the vertical distribution of major salt content in the soil.The results showed that the EC value of each soil layer and the major salt ion contents of facility vegetable soil were obviously higher than that of the CK in the open field.NO3-was the major anion in different soil layers of this area and SO42-was also higher;while Ca2+was the main cation.Soil EC value and the salt ion content were both higher in 0-10 cm soil layer,indicating possessing topsoil accumulation for them. Soil salinization had developed to deeper layers in some base.%为了解设施蔬菜土壤盐渍化状况，对江苏中南部设施蔬菜产区典型盐渍化土壤的0～40 cm土层，以10 cm为单位进行分层取样，并以相邻棚外的露地土壤为对照，测定了土壤EC值及主要盐分离子含量在土层间的垂直分布情况。结果表明：设施内各土层的EC值和主要盐分离子含量均明显高于棚外对照。阴离子以NO3-为主，但SO42-含量也较高，阳离子则以Ca2+为主。设施土壤0～10 cm土层的EC值和主要盐分离子含量均较高，具有明显的表聚性；部分基地的土壤盐渍化已向深层发展。