domain of a soil with a certain vertical extension developed through non-pedogenic processes, displaying a change in structure and/or composition to possibly over- or underlying adjacent domains, or a grouping of soil horizons or other sub-domains with a special purpose.
-- Description --
NOTE1 Different kinds of layer concepts are covered by this definition.
EXAMPLE 1 Geogenic layers: These are domains, resulting from e.g. sedimentation (as non-pedogenic) processes, that display an unconformity to possibly over- or underlying adjacent domains.
EXAMPLE 2 Topsoil and Subsoil: These can be domains that group different soil horizon types (e.g. A vs. B horizons), or a special case of fixed depths with only two depth ranges (e.g. 0-15 cm: topsoil and, 15-75 cm: subsoil).
EXAMPLE 3 Depth intervals: They are often used in soil monitoring, sampling of contaminated sites and in modelling and include: (i) depth increments (also called fixed depths) that are often used for sampling, e.g. 0-30cm, 30-60cm, and so on, (ii) a single depth range in which a soil sample (”specimen”) is taken and for which the analytical result is valid, and (iii) soil slicing, that is, profile segmentation according to a specified vector, for instance, either regularly spaced intervals (1cm), or a user-defined vector of segment boundaries (i.e. 0-10, 10-25, 25-50, 50-100). Slicing is used in modelling to generate continuous depth functions for soil properties.
EXAMPLE 4: In the framework of soils deeply modified by human activity, artificial layers may be due to different kinds of deposits (concrete, bricks, …).
SOURCE WD ISO28258, modified
| Egenskap |
Stereotype |
Beskrivelse |
Type |
Multiplisitet |
| layerType |
|
-- Name --
layer type
|
LayerTypeValue |
1..1 |
| layerRockType |
voidable |
-- Name --
layer rock type
<font color="#ff0000">
</font> |
LithologyValue |
0..* |
| layerGenesisProcess |
voidable |
-- Name --
layer genesis process
|
EventProcessValue |
0..1 |
| layerGenesisEnvironment |
voidable |
-- Name --
layer genesis environment
|
EventEnvironmentValue |
0..1 |
| layerGenesisProcessState |
voidable |
-- Name --
layer genesis process state
|
LayerGenesisProcessStateValue |
0..1 |
| Navn |
Type |
Lengde |
Multiplisitet |
|
LayerTypeValue |
|
1..1 |
|
LithologyValue |
|
0..* |
|
EventProcessValue |
|
0..1 |
|
EventEnvironmentValue |
|
0..1 |
|
LayerGenesisProcessStateValue |
|
0..1 |
| Name |
Type |
English |
Description |
| layerType |
LayerTypeValue |
|
assignation of a layer according to the concept that fits its kind.
-- Description --
EXAMPLE Topsoil: meaning the upper part of the natural mineral soil that is generally dark coloured and has a higher content of organic matter and nutrients when compared to the mineral horizons below.
|
| layerRockType |
LithologyValue |
|
type of the material in which the layer developed.
-- Description --
simplified list of terms to “classify” geologic units
|
| layerGenesisProcess |
EventProcessValue |
|
last non-pedogenic process (geologic or anthropogenic) that coined the material composition and internal structure of the layer.
|
| layerGenesisEnvironment |
EventEnvironmentValue |
|
setting in which the last non-pedogenic process (geologic or anthropogenic) that coined the material composition and internal structure of the layer took place.
-- Description --
The material in which a soil develops is influenced by the environmental situation in which the processes of its formation took place, e.g. sedimentation from water results in quite differently structured layers when it has been deposited in running water than in a lake.
|
| layerGenesisProcessState |
LayerGenesisProcessStateValue |
|
indication whether the process specified in layerGenesisProcess is on-going or seized in the past.
-- Description --
Process state gives an idea whether current non-pedogenic processes affect the soil or not. E.g. on current floodplains, input of sediments during seasonal flooding events is received, with comparatively young soil development in it, while in older fluvial sediments that are no longer under a regime of seasonal or irregular flooding, soil development might be more advanced.
|
| Navn |
Beskrivelse |
| geogenicConstraint |
/*The attributes layerGenesisProcess, layerGenesisEnvironment, layerGenesisProcessState and layerRockType are only needed when layerType is of the value 'geogenic'*/
inv: self.layerType = LayerTypeValue::geogenic implies (self.layerGenisisEnvironment.isNotEmpty() and self.layerGenisisProcess.isNotEmpty() and self.layerRockType.isNotEmpty() and layerGenesisProcessState.isNotEmpty())
|
