Represents soil structures that are associated with the process of determining the SoilData.SoilTextureClass.
[Visual Basic] Public Enum SoilData.SoilStructure [C#] public enum SoilData.SoilStructure [C++] public __value enum SoilData.SoilStructure [JScript] public enum SoilData.SoilStructure
Remarks
Soil structure refers to the natural organization of soil particles into discrete soil units (peds) which are separated from each other by persistent surfaces of weakness (FAO-ISRIC, 1990)1.
Members of this enumeration can be classified into 4 subgroups:
- Basic types - Granular, Blocky, Prismatic and Platy;
- Subtype - Columnar;
- Structureless types - Massive and SingleGrained;
- Pseudo-types - Oxic and Vertic.
References
1 FAO-ISRIC. 1990. Guidelines for Soil Description. FAO, Rome. p48.
2 Driessen, P.M. and R. Dudal (eds). 1989. Lecture Notes on the Major Soils of the World. Agricultural University Wageningen, Wageningen, the Netherlands, and Catholic University of Leuven, Leuven, Belgium. p150. A revised edition available at FAO (2001).
3 Same as 2, pp69-70.
4 Dudal, R. and H. Eswaran. 1988. Distribution, properties and classification of Vertisols. In: Wilding, L.P. and R. Puentes (eds). Vertisols: Their Distribution, Property, Classification and Management. SMSS Technical Monograph No. 18, Texas A&M University, College Station, Texas, USA. pp1-22.
Members
| Member Name | Description |
|---|---|
| Granular | Spheroids or polyhedrons, having curved or irregular surfaces which are not casts of the faces of surrounding peds. |
| Blocky | Blocks or polyhedrons, nearly equidimensional, having flat or slightly rounded surfaces which are casts of the faces of the surrounding peds. |
| Prismatic | The dimmensions are limited in the horizontal and extended along the vertical plane; vertical faces well defined; having flat or slightly rounded surfaces which are casts of the faces of the surrounding peds. Faces normally intersect at relatively sharp angles. |
| Platy | Flat with vertical dimmensions limited; generally oriented on a horizontal plane and usually overlapping. |
| Columnar | Prismatic structures with rounded caps. |
| Massive | No visible structure, hard to break apart and in very large clods. |
| SingleGrained | Individual particles which do not stick together. Usually accompanies a loose consistence. Commonly found in sandy soils. |
| Oxic | Characterized by the following (Driessen and Dudal, 1989)2:
|
| Vertic | Characteristic structural aggregates of a vertic horizon. Presence of shining slikensides at an angle of 20 to 30 degrees with the horizontal plane. Intersecting shear planes define wedge-shaped angular blocky peds. Mostly extends from some 15 to 20 cm below the surface mulch down to the transition of solum to substratum, just below the depth of cracking (Driessen and Dudal, 1989)3. Figures: Vertisol profile and cross-section of a Vertisol pedon (Dudal and Eswaran, 1988)4 |
Requirements
Namespace: UGent.WLES.Data
Assembly: WLES (in WLES.dll)
See Also
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