gilgai soil
Noun: - A type of soil characterized by a distinctive microrelief of mounds and depressions, found in certain regions of Australia: Gilgai soil is a specific soil formation where the surface has a regular pattern of small mounds and hollows, often described as resembling a "melon hole" pattern. This pattern is typically caused by the shrink-swell behavior of clay-rich soils in response to wetting and drying cycles.
- Noun:
- The farmer had difficulty plowing the field due to the uneven surface of the gilgai soil.
- Gilgai soil is a common feature in the expansive clay plains of inland Australia.
- The unique hydrology of the area is influenced by the presence of gilgai soil.
"Gilgai complex": Refers to the complete soil-landscape unit that includes the characteristic gilgai microrelief and the associated soil types within the mounds and depressions.
- The ecologist studied the plant distribution across the entire gilgai complex.
"Gilgai microrelief": Specifically describes the small-scale, patterned topography of mounds and depressions.
- Aerial photography clearly reveals the intricate gilgai microrelief of the landscape.
Gilgai (noun): Often used as a shorter form to refer to gilgai soil or the landform itself.
- The property contains several hectares of gilgai.
Vertisol (noun): A soil order in international classification systems to which many gilgai-forming soils belong, characterized by high clay content and significant shrink-swell potential.
- The gilgai soil is classified as a Vertisol.
- Crabhole soil: A regional term used in parts of Australia for a similar soil formation with hollows.
- Self-mulching soil: Describes a surface property of some of these soils, where the surface layer naturally becomes loose and granular.
- Shrink-swell: The physical process of clay soils expanding when wet and contracting when dry, which is the primary mechanism for gilgai formation.
- Melon hole: A colloquial Australian term describing the depression part of the gilgai pattern.
- soil in the melon holes of Australia