The boundary between the horizons can be described considering the distinctness and topography. Distinctness refers to the degree of contrast between two adjoining horizons and the thickness of the transition between them. Topography refers to the shape or degree of irregularity of the boundary. In Figure 9.3.1 examples for several boundaries are shown.
Figure 9.3.1. Boundaries between soil horizons.
Table 9.3.1. Classification of horizon boundaries.
|
Distinctness |
Abbreviation |
[cm] |
|
Abrupt |
a |
< 2 |
|
Clear |
c |
2 - 5 |
|
Gradual |
g |
5 - 15 |
|
Diffuse |
d |
> 15 |
|
Topography |
Abbreviation |
Description |
|
Smooth |
s |
Nearly a plane |
|
Wavy |
w |
Waves wider than deep |
|
Irregular |
i |
Depth greater than width |
|
Broken |
b |
Discontinuous |
Information provided by: http://www.soils.wisc.edu