Characteristics of Water and Salt Transport in Layered Soils

Abstract

Characteristics of water and salt transport in layered soils with the loess soil layer overlapping different particle size sandy soil layer, was investigated in two dimensions soil chamber. The results show that, finger flow occurs when the wetting front enters into the low layer sandy soil, and the accumulative infiltration is greater for coarser particle size sandy soil than that for finer particle size one. The behavior of water movement and salt transport are disagree since salt content in soil profile has a significant difference for two treatments and water content is almost same. The further analysis explains this phenomenon is mainly caused by adsorption of the finer sandy soil to Na+. In additional, Cl- is easier to movement in pathway of the finger flow than that of Na+ whether the soil texture was same or not.