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Jan 1, 2020 · Soil horizons reflect soil processes and convey information about past and present soil conditions. The identification and delineation of soil horizons are affected by lateral and vertical variation in soil properties.
- Identification and Quantification of Soil Redoximorphic Features by Digital Image Processing
Digital image processing techniques, often used in soil...
- Dynamic Pedogenesis
An example is an illuvial clay horizon that becomes so dense...
- The Philosophical Status of Soil Science
Soil physics has long played a role in soil studies through...
- Progressive and Regressive Pedogenesis and Complex Soil Evolution
The simultaneous operation of regressive and progressive...
- Past Use and Future Prospects
A soil horizon may be defined as: a layer of soil, revealed...
- Some Remarks on Soil Horizon Classes
Perhaps unremark- ably this explains why there is often con-...
- Principles of Soil Horizon Definition and Classification
The A-B-C system of horizon nomenclature is shown to be...
- Soil Horizon Use by The U.S. Soil Survey
Thus the morphology of soil hori- zons is dominantly...
- Identification and Quantification of Soil Redoximorphic Features by Digital Image Processing
A soil horizon is a layer of mineral or organic soil material approximately parallel to the land surface that has characteristics altered by processes of soil formation. It differs from adjacent horizons in properties such as color, structure, texture, and consistence and in chemical, biological, or mineralogical composition.
Examine the profile closely, using your senses to identify further boundaries and subdivisions based on color, texture, structure, carbonates, coarse fragments, mottling, and redoximorphic features. Conduct a detailed description of each horizon, including color (using a Munsell color book), texture (by feel), structure, carbonates (tested with ...
Horizon: soil layer, parallel to the soil surface, with physical, chemical, or biological characteristics that are distinct from the layers above or below it, and usually differentiated based on color, texture, and organic matter. From: Trends in Ecology & Evolution, 2013
The horizon nomenclature and morphology of these soils are different because of the different processes acting on the parent material. For example, rather than A, B, and C horizons that are standard for mineral soils, the organic soils consist of O horizons.
Units for Soil Classification. Pedon – smallest three-dimensional unit that displays the full range of properties characteristic of a given soil. (1-10 m2 of area) - the fundamental unit of soil classification. Polypedon – group of closely associated pedons in the field.
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Why are Horizon nomenclature and morphology different?
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Aug 11, 2009 · An A2 horizon is most commonly differentiated from an overlying A1 by lighter color and is generally measurably lower in organic matter. An A2 horizon is most commonly differentiated from an underlying B in the same profile by lighter color, or coarser texture, or both.
