fragipan

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fragipan

[′fraj·ə‚pan]

(geology)

A dense, natural subsurface layer of hard soil with relatively slow permeability to water, mostly because of its extreme density or compactness rather than its high clay content or cementation.

References in periodicals archive ?

It typically inhabits moist environments on moderate slopes or occasionally at their base, which possesses a tough, impermeable upper layer of soil, known as a fragipan, that causes water to flow downhill similarly to the movements of a water slide, rather than soaking vertically into the soil.

Woodland wildflowers on the edge

These dense horizons present a slow deformation when subjected to compression under wet conditions, unlike fragipan, which shatters suddenly (EMBRAPA 2013).

Genesis of cohesive soil horizons from north-east Brazil: role of argilluviation and sorting of sand

alluvium, colluvium, residuum Limestone class No limestone, limestone in combination, limestone Drainage class Very poorly drained to excessively drained Soil taxonomic order Flooding frequency Soil layer restriction type None, fragipan or claypan, bedrock Soil depth (cm) Depth to either the bottom of the soil profile or soil restriction Water holding capacity (cm/cm) PH Base saturation ECEC/sum of bases Fragments (%) Organic matter (%) Clay (%) Sand (%) Elevation (m) Slope (%) 1 + sin (aspect/ 180 *3.

Comparing predicted historical distributions of tree species using two tree-based ensemble classification methods

Hydrologic Calibratoin of the SWAT Model in a Watershed Cotaining Fragipan Soils.

Study of hypothetical scenarios in the Riacho dos Namorados watershed in Cariri Paraibano using SWAT model/Aplicacao do modelo SWAT para estudo de cenarios hipoteticos na bacia hidrografica do Riacho dos Namorados no Cariri Paraibano

Erosion induced changes in properties of a fragipan soil, Soil Science Society of America Journal 54: 223-228.

Agro-environmental lessons from the 'sustainable highland agriculture in South-East Asia' (Shasea) project/Zemes ukio ir aplinkosaugine patirtis vykdant projekta "tvarusis zemes ukis pietryciu azijos aukstumose"

Pre-mining soils are largely order Alfisols and Subgroup Typic Fragiudalfs (Miles and Weiss, 1978) including infertile fragipan and claypan soils.

Soil quality, forests, and water resources of stripmines

These soils were layered in different ways as follows: (Hagerstown) a silt loam Ap horizon underlain by a high clay content B horizon in the top meter, (Monongahela) a silt loam Ap horizon underlain by a fragipan in the top meter, and (Nolin) a silt loam alluvial soil underlain by a gravel layer in the top meter (Braker, 1981).

Predicting saturated hydraulic conductivity from percolation test results in layered silt loam soils

The soil is characterised by a fragipan or C horizon (depth range 400-700 mm depending on slope position) with restricted drainage properties and is classified as a Mottled Fragic Pallic soil by the New Zealand Soil Classification (Hewitt 1998) or an Aeric Fragiaquept by USDA Taxonomy (Soil Survey Staff 1998).

Soil quality and plant yield under dryland and irrigated winter forage crops grazed by sheep or cattle

That experience explored the functions of fractures in fragipan soils, including both a dyed pit study at ATI's Apple Creek farm and a fresh till cut at the Rupp Gravel Pit.

Further explorations into Ohio's fractured environment: introduction to the Ohio Journal of Science's second special issue on fractures in Ohio's glacial tills (1)

Letter Designation Characteristics a, e, i Refers to highly (sapric), intermediate (hemic), or slightly (fibric) decomposed material b Used with any horizon that has been buried by overlying deposits c Concretions present g Strongly gleyed (referring to the amount of reduced iron present) h Illuvial (from leaching above), accumulation of organic material m 90% cemented p Mixed by plowing r Weathered bedrock that can be dug with a spade t Accumulation of clay x Fragipan present z Accumulation of soluble salts

Chapter 2 Soil geography and genesis

There was a putative fragipan at 40- to 60-cm depth at both sites.

Herbage nitrogen recovery in a meadow and loblolly pine alley

The Barrens is characterized as gently sloping topography and low relief with fragipan associated in the soils that cause seasonal wetlands (DeSelm, 1994; Pyne, 2000).