Clorpt
Encyclopedia
Clorpt or Corpt is a mnemonic
for Hans Jenny
's famous state equation for soil formation:
S = f(cl,o,r,p,t,….)
Jenny pointed out that there are two principal methods that the state equation may be solved: first in a theoretical or conceptual manner by logical deductions from certain premises, and second empirically by experimentation or field observation.
The empirical method is still mostly employed today, and soil formation can be defined by varying a single factor and keeping the other factors constant. This led to the development of empirical models to describe pedogenesis
, such as climofunctions, biofunctions, topofunctions, lithofunctions, and chronofunctions. Since Hans Jenny
published his formulation in 1941, it has been used by innumerable soil survey
ors all over the world as a qualitative list for understanding the factors that may be important for producing the soil pattern within a region.
The term Clorpt is mainly used for empirical quantitative prediction with the purposes of making digital soil map
.
In this approach, the state-factor equation was put explicitly into a spatial framework and the factors were also observed in the same spatial domain. Some people have termed the approach environmental correlation, associated with using stratigraphy, digital terrain models and gamma radiometric survey, to predict and map soil properties.
Mnemonic
A mnemonic , or mnemonic device, is any learning technique that aids memory. To improve long term memory, mnemonic systems are used to make memorization easier. Commonly encountered mnemonics are often verbal, such as a very short poem or a special word used to help a person remember something,...
for Hans Jenny
Hans Jenny (pedologist)
Hans Jenny was a soil scientist and expert on pedology , particularly the processes of soil formation.- Overview :...
's famous state equation for soil formation:
S = f(cl,o,r,p,t,….)
- S is for soilSoilSoil is a natural body consisting of layers of mineral constituents of variable thicknesses, which differ from the parent materials in their morphological, physical, chemical, and mineralogical characteristics...
, - cl (sometimes c) represents climateClimateClimate encompasses the statistics of temperature, humidity, atmospheric pressure, wind, rainfall, atmospheric particle count and other meteorological elemental measurements in a given region over long periods...
, - o organismOrganismIn biology, an organism is any contiguous living system . In at least some form, all organisms are capable of response to stimuli, reproduction, growth and development, and maintenance of homoeostasis as a stable whole.An organism may either be unicellular or, as in the case of humans, comprise...
s including humans, - r reliefTerrainTerrain, or land relief, is the vertical and horizontal dimension of land surface. When relief is described underwater, the term bathymetry is used...
, - p parent materialParent materialIn soil science, parent material is the underlying geological material in which soil horizons form...
, or lithologyLithologyThe lithology of a rock unit is a description of its physical characteristics visible at outcrop, in hand or core samples or with low magnification microscopy, such as colour, texture, grain size, or composition. It may be either a detailed description of these characteristics or be a summary of...
, and - t timeTimeTime is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of objects....
.
Jenny pointed out that there are two principal methods that the state equation may be solved: first in a theoretical or conceptual manner by logical deductions from certain premises, and second empirically by experimentation or field observation.
The empirical method is still mostly employed today, and soil formation can be defined by varying a single factor and keeping the other factors constant. This led to the development of empirical models to describe pedogenesis
Pedogenesis
Pedogenesis is the science and study of the processes that lead to the formation of soil ' and first explored by the Russian geologist Vasily Dokuchaev , the so called grandfather of soil science, who determined that soil formed over time as a consequence of...
, such as climofunctions, biofunctions, topofunctions, lithofunctions, and chronofunctions. Since Hans Jenny
Hans Jenny (pedologist)
Hans Jenny was a soil scientist and expert on pedology , particularly the processes of soil formation.- Overview :...
published his formulation in 1941, it has been used by innumerable soil survey
Soil survey
Soil survey, or soil mapping, is the process of classifying soil types and other soil properties in a given area and geo-encoding such information. It applies the principles of soil science, and draws heavily from geomorphology, theories of soil formation, physical geography, and analysis of...
ors all over the world as a qualitative list for understanding the factors that may be important for producing the soil pattern within a region.
The term Clorpt is mainly used for empirical quantitative prediction with the purposes of making digital soil map
Digital soil mapping
Digital Soil Mapping in soil science, or "predictive soil mapping", is the computer-assisted production of digital maps of soil type and soil properties. Digital Soil Mapping involves the creation and population of spatial soil information by the use of field and laboratory observational methods...
.
In this approach, the state-factor equation was put explicitly into a spatial framework and the factors were also observed in the same spatial domain. Some people have termed the approach environmental correlation, associated with using stratigraphy, digital terrain models and gamma radiometric survey, to predict and map soil properties.