中文摘要：

根据碘-淀粉显色原理示踪土壤非均匀流动，探讨非均匀水流运动和溶质迁移描述方法。在1．0m×1．0m尺度上开展试验，60mm碘离子溶液入渗后，在70cm深度内逐层开挖剖面，剖面中水流经过的区域喷洒淀粉溶液后显色，采用图像分析和率定的方法建立了土壤显色和碘离子浓度之间的关系。采用环状直方图，从浓度空间分布和信息量两个方面对流动非均匀性进行了描述。碘．淀粉显色示踪方法较好地显现了非均匀流动模式，环状直方图分析表明，浓度分布的离散程度随浓度值的减小而增加，描述流动的非均匀性需要考虑水平和垂直方向上流动非均匀特征，非均匀流动的相似性随着距离的增加而明显下降。

英文摘要：

An experiment was carried out using the principle of iodine-starch staining tracing heterogeneous flow in soil to depict movement of heterogeneous water flow and transport of solute. In two experimental plots, 1.0 m ×1.0 m each, 60 mm of iodide solution was applied. A profile was dug layer by layer till 70 cm in depth. Then starch solution was sprayed over the profile, making the area the iodide solution passed through stained. Image analysis and calibration experiments were conducted to characterize soil color and iodine concentration. Annular histogram method was introduced to represent heterogeneous flow features with taking concentration spatial distribution and heterogeneity information into consideration. The iodine-starch staining tracing method was proved to be a better one to display the pattern of heterogeneous flow, and the annular histogram analysis demonstrated that the discrete degree of iodide concentration distribution increased with the decrease in concentration. To describe heterogeneity of the flow, it is necessary to take into account the heterogeneous features of the flow going in vertical and horizontal directions. Similarity of heterogeneous flows declined with the increase in distance the flows covered.