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红壤和紫色土是我国南方分布广泛的两类土壤.本文通过盆栽试验,测定了已被侵蚀的这两种土壤的含水量及水势能变化,经数理统计分析,建立了数学模型和土壤水分特征曲线.结果表明:土壤含水量与水势能呈负相关;同样含水量的水势能侵蚀紫色土>侵蚀红壤>砂壤土;侵蚀红壤的比水容量则大于侵蚀紫色土.这说明保水能力强的土壤供水能力不一定强.改良土壤结构,增强毛细管数量是提高土壤对作物保持有效水量的唯一途径.
The red soil and the purple soil are the two types of soils widely distributed in southern China.Through the pot experiment, the water and potential energy changes of the two soils which have been eroded were measured. Through the mathematical statistics analysis, the mathematical model and soil moisture characteristics The results show that the soil water content is negatively correlated with the water potential energy, and the water potential with the same water content can erode the purple soil> eroded red soil> sandy loam soil; the specific water capacity of the eroded red soil is greater than the erosion of the purple soil, Water supply capacity may not be strong. Improving the soil structure and increasing the number of capillaries are the only ways to increase the amount of water available to the crop.