Changes in flow and transport patterns in fen peat following soil degradation

摘要: The preferential movement of water and transport substances play an important role in soil, but they are not yet fully understood, especially degraded peat soil. In this study, we aimed to deduce changes flow patterns with titanium dioxide (TiO2) as a dye tracer during the course soil degradation resulting from drainage. experiments were carried out on columns eight types differently three sites taken both vertical horizontal directions. suspension (average particle size 0.3 µm; 10 g l−1) was applied pulse 40 mm each core. cores subsequently cut into six slices, photographed images analysed for extent cover number pores. addition, saturated hydraulic conductivity (Ks) determined. Preferential occurred all investigated. From stained structural elements, concluded that undecomposed plant remains major pathways less peat. For more strongly peat, bio-pores, such root earthworm channels, operated network. Results show Ks effective pore network anisotropic. With increasing degradation, cross-section pores decreased predominant direction only anisotropy properties decreased. closely related macropores continuity. Therefore, conclude result disintegration peat-forming material decrease continuity macropores. Highlights We degradation. TiO2 (dye tracer) used visualize soil. The paths, structures changed degradation. Changes paths relate materials structure.