淮北平原典型土壤水分特征曲线测定与分析

Study on Soil Water Characteristic Curve of Representative Soil in Huaibei Plain

为获得包气带土壤垂向属性特征,进而研究包气带水分运移规律,采用离心机法测定了淮北平原砂姜黑土区典型土壤10个不同深度的土壤水分特征曲线,分析了土壤水分特征曲线在垂向上的变化规律,同时测定相应深度土壤的机械组成和容重,分析其对土壤水分特征曲线的影响。结果表明,该区域土壤水分特征曲线垂向分布差异很大,在包气带水分最活跃的0～50cm差异最大。由于土壤垂向的巨大变化,淮北平原包气带水分运动模拟宜分层考虑。

In order to get the vertical attribute characteristics of soil and study soil water movement in the vadose zone,the centrifuge method is used to measure soil water characteristic curve in 10 different depth of the typical soil in Huaibei plain.At the same time,soil mechanical composition and bulk density are measured to analyze their impacts on the soil water characteristic curve.The results show that the soil water characteristic curves in the vertical direction have great differences in this region;the biggest difference appears within the range 0-50cm of the vandose zone where the water movement is most active;due to the huge difference of soil vertically,the simulation of water movement in the vadose zone should be stratified in the Huaibei Plain area.