Three-dimensional patterns of moisture, water repellency, bromide and pH in a sandy soil

摘要

Soil water repellency might lead to preferential flow of water and solutes through the unsaturated zone of soils. To study this process in a water repellent sandy field soil, a bromide tracer had been applied on a 2.2 m long and 0.4 m wide plot. The bromide application rate was 8 g/m~2, and the plot was sampled using 100 cm~3 steel cylinders after 52 mm of rainfall in 12 days. A total of seven layers were sampled to a depth of 74 cm. Each layer was sampled at 240 Locations in a 40 by 6 grid. All samples were used for the determination of soil water content, Degree of actual and potential water repellency, bromide concentration and pH.