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Overview

Alfisols

A soil order of the US soil classification. Alfisols are young, acid soils, with a clay-rich B horizon, commonly occurring beneath deciduous forests. See brown earth.

alfisols

alfisols   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences, Social sciences, Environment
Length:
67 words
Illustration(s):
1

... ( grey-brown podzolics ) Mineral soils that are grouped as an order. These soils have clay -enriched argic horizons , are alkaline to intermediate in reaction, with the base saturation in the B horizon more than 35 per cent, are usually derived from base-rich parent materials, and are drier than −15 bars moisture potential for at least three months when plants could grow. ...

alfisols

alfisols   Quick reference

A Dictionary of Plant Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
95 words

... ( grey-brown podzolics ) An order of mineral soils that have clay -enriched or argillic B horizons ( see argic horizon ); are alkaline to intermediate in reaction, with the base saturation in the B horizon more than 35 per cent; are usually derived from base-rich parent materials; and are drier than -15 bars moisture potential for at least three months when plants could grow. Alfisols occur under deciduous woodland or grassland in humid areas of the world and are generally productive agricultural soils. Brown earths are the equivalent in...

alfisols

alfisols   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

... ( grey-brown podzolics ) An order of mineral soils that have clay -enriched or argillic B horizons ; are alkaline to intermediate in reaction, with the base saturation in the B horizon more than 35%; are usually derived from base-rich parent materials; and are drier than −15 bars moisture potential for at least three months when plants could...

Alfisols

Alfisols  

A soil order of the US soil classification. Alfisols are young, acid soils, with a clay-rich B horizon, commonly occurring beneath deciduous forests. See brown earth.
alfisol

alfisol   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

... A soil order of the US soil classification . Alfisols are young, acid soils, with a clay-rich B horizon, commonly occurring beneath deciduous forests. See brown earth...

alfisol

alfisol   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... A type ( order ) of soil that typically develops beneath broadleaved forest . It has a much thicker A‐horizon than most other soils, because leaves and other litter decompose quickly during the mild, wet winters. The A‐horizon often has a white layer, indicating eluviation of nutrients into the soil. An alfisol also has a relatively thick B‐horizon where clay and plant nutrients accumulate by illuviation...

alfisol

alfisol noun   Quick reference

New Oxford American Dictionary (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
54 words
alfisol

alfisol noun   Quick reference

Oxford Dictionary of English (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
53 words
Comprehensive Soil Classification System

Comprehensive Soil Classification System  

A system for classifying soils that was developed by the US Department of Agriculture and is now widely used around the world. All soils are divided into 11 soil orders, which in turn are subdivided ...
soil order

soil order  

The highest level within a soil classification. There are 11 soil orders in the Comprehensive Soil Classification System, which are alfisols, andisols, aridisols, entisols, histosols, inceptisols, ...
grey-brown podzolic

grey-brown podzolic  

A soil-*profile term describing eluviated (see eluviation), freely draining soils that have a distinctive clay-enriched B horizon. The soil develops under temperate woodlands which have a moderate ...
brown earth

brown earth  

A freely draining, and only slightly horizonated, soil-profile type. It has a mull humus in the surface horizon and very little differentiation of horizons below. Brown earths are well-weathered and ...
US soil classification

US soil classification  

The US Department of Agriculture recognized ten major soil groups in the Seventh Approximation. Alfisols are relatively young and acid soils with a clay B horizon. Aridisols are semi-desert and ...
soil classification

soil classification  

The systematic arrangement of soils into groups or categories on the basis of their characteristics. Also known as soil taxonomy. See also Comprehensive Soil Classification System.
grey-brown podzolic

grey-brown podzolic   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

...podzolic Soil-profile term describing eluviated , freely draining soils that have a distinctive clay -enriched B horizon . See also alfisols...

soil order

soil order   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

...order The highest level within the Comprehensive Soil Classification System . There are eleven soil orders: alfisols , andosols , aridisols , entisols , histosols , inceptisols , mollisols , oxisols , spodsols , ultisols , and vertisols...

grey-brown podzolic

grey-brown podzolic   Quick reference

A Dictionary of Plant Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
46 words

...A soil- profile term describing eluviated ( see eluviation ), freely draining soils that have a distinctive clay -enriched B horizon . The soil develops under temperate woodlands which have a moderate rainfall, and forms good pastureland after deforestation. See also alfisols...

soil taxonomy

soil taxonomy   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

...taxonomy The system of soil classification that was devised by workers in the US Soil Survey, within the USDA . It divides soils into twelve orders: alfisols , andosols , aridisols , entisols , gelisols , histosols , inceptisols , mollisols , oxisols , spodosols , ultisols , and vertisols . These orders are further subdivided into suborders, great groups, families, and soil series, defined by diagnostic horizons...

grey-brown podzolic

grey-brown podzolic   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

... eluviation ), freely draining soils that have a distinctive clay -enriched B horizon . The soil develops under temperate woodlands which have a moderate rainfall, and forms good pasture-land after deforestation. The term is obsolete under the USDA Soil Taxonomy. See also Alfisols...

brown earth

brown earth   Quick reference

A Dictionary of Plant Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
102 words

...in the Inceptisols ). Brown-earth types of soil are very productive and, although their natural climax vegetation in humid, temperate latitudes is deciduous forest, they have been used extensively for agriculture. The soil type is common in southern England. See also alfisols...

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