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采用PVC管在梯田、果园和坝地3种地类取原状土样,土样分表土层、心土层及整体3个层次。将土样带回实验室内采用无压力的供水入渗装置测定土壤的入渗性能。对每个土样的入渗性能进行连续跟踪观测,以土柱底部的稳定出水率为该土层深度的稳渗率。研究结果表明:不同地类土壤的入渗性能存在很大差异,同一地类不同深度土层的入渗性能差异也很显著;原状土的入渗能力要好于扰动土,表层土的入渗结构及入渗能力好于心土层;用原状土进行入渗试验能够更真实地表征土壤的入渗性能,将入渗速率引入测定深度概念,能更精确地表述土壤在垂直尺度上的空间变化和影响因子,对更科学准确地研究土壤入渗、完善土壤入渗理论具有重要的指导价值。
Using PVC pipe in terraced fields, orchards and dam land three kinds of original soil samples, soil samples topsoil, heart soil layer and the overall three levels. The soil samples were taken back to the laboratory to measure infiltration properties of the soil using a pressureless water supply infiltration device. The infiltration performance of each soil sample was continuously observed and observed, and the steady water discharge rate at the bottom of soil column was the steady infiltration rate of soil depth. The results show that the infiltration properties of soils in different types of soils are quite different, and the infiltration performance of soils in different depths of the same landform is also very different. The infiltration capacity of undisturbed soils is better than that of disturbed soils and surface soils And infiltration capacity is better than the heart and soil layer; infiltration test with undisturbed soil can more accurately characterize soil infiltration performance, the infiltration rate into the concept of measurement depth, can more accurately describe the spatial variation of soil in the vertical scale And influencing factors, it has important guiding value for studying soil infiltration and improving soil infiltration theory more scientifically and accurately.