B.Histosols

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎

The central concept of Histosols is that of soils forming in organic soil materials. The general rule is that a soil without permafrost is classified as a Histosol if half or more of the upper 80 cm is organic. A soil is also classified as a Histosol if the organic materials rest on rock or fill or partially fill voids in fragmental, cindery, or pumiceous materials. If the bulk density is very low, less than 0.1, three-fourths or more of the upper 80 cm must be organic.  Definition of Histosols and Limits Between Histosols and Soils of Other Orders  Histosols are soils that: 1. Do not have either of the following:                 a. Permafrost within 100 cm of the soil surface; or                 b. Gelic materials within 100 cm of the soil surface and permafrost within 200 cm of the soil surface; and 2. Do not have andic soil properties in 60 percent or more of the thickness between the soil surface and either a depth of 60 cm or a densic, lithic, or paralithic contact or duripan if shallower; and 3. Have organic soil materials that meet one or more of the following:                 a. Overlie cindery, fragmental, or pumiceous materials and/or fill their interstices and directly below these materials have either a densic, lithic, or paralithic contact; or                 b. When added with the underlying cindery, fragmental, or pumiceous materials, total 40 cm or more between the soil surface and a depth of 50 cm; or                 c. Constitute two-thirds or more of the total thickness of the soil to a densic, lithic, or paralithic contact and have no mineral horizons or have mineral horizons with a total thickness of 10 cm or less; or                 d. Are saturated with water for 30 or more cumulative days during normal years (or are artificially drained), have an upper boundary within 40 cm of the soil surface, and have a total thickness of either:                                 (1) 60 cm or more if three-fourths or more of their volume consists of moss fibers or if their bulk density, moist, is less than 0.1g/cm3; or                                 (2) 40 cm or more if they consist either of sapric or hemic materials, or of fibric materials with less than three-fourths (by volume) moss fibers and a bulk density, moist, of 0.1 g/cm3 or more.  Limits Between Histosols and Soils of Other Orders  The definition of Histosols must provide criteria that separate Histosols from all other orders. The aggregate of these criteria defines the limits of Histosols in relation to all other known soils. 1. Unlike Gelisols, Histosols do not have:                 a. Permafrost within 100 cm of the soil surface; or                 b. Gelic materials within 100 cm of the soil surface and permafrost within 200 cm of the soil surface; 2. Unlike Andisols, Histosols do not have andic soil properties in 60 percent or more of the thickness between the soil surface and either a depth of 60cm, or a densic, lithic, or paralithic contact or duripan if shallower; 3. Unlike all other mineral soil orders, Histosols have organic soil materials that meet one or more of the following:                 a. Overlie cindery, fragmental, or pumiceous materials and/or fill their interstices1 and directly below these materials have either a densic, lithic, or paralithic contact; or                 b. When added with the underlying cindery, fragmental, or pumiceous materials, total 40 cm or more between the soil surface and a depth of 50 cm; or                 c. Constitute two-thirds or more of the total thickness of the soil to a densic, lithic, or paralithic contact and have no mineral horizons or have mineral horizons with a total thickness of 10 cm or less; or                 d. Constitute two-thirds or more of the total thickness of the soil from the soil surface to 25 cm below the upper boundary of permafrost and have no mineral horizons or have mineral horizons with a total thickness of 10 cm or less within that depth; or                 e. Are saturated with water for 30 or more cumulative days during normal years (or are artificially drained), have an upper boundary within 40 cm of the soil surface, and have a total thickness of either:                                 (1) 60 cm or more if three-fourths or more of their volume consists of moss fibers or if their bulk density, moist, is less than 0.1g/cm3; or                                 (2) 40 cm or more if they consist either of sapric or hemic materials, or of fibric materials with less than three-fourths (by volume) moss fibers and a bulk density, moist, of 0.1 g/cm3 or more.  Key to Suborders  BA. Histosols that are saturated with water for less than 30 cumulative days during normal years (and are not artificially drained). Folists, p. 478  BB. Other Histosols that: 1. Have more thickness of fibric soil materials than any other kind of organic soil material either:                 a. In the organic parts of the subsurface tier if there is no continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier; or                 b. In the combined thickness of the organic parts of the surface and subsurface tiers if there is a continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier; and 2. Do not have a sulfuric horizon that has its upper boundary within 50 cm of the soil surface; and 3. Do not have sulfidic materials within 100 cm of the soil surface. Fibrists, p. 474  BC. Other Histosols that have more thickness of sapric soil materials than any other kind of organic soil materials either: 1. In the organic parts of the subsurface tier if there is no continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier; or 2. In the combined thickness of the organic parts of the surface and subsurface tiers if there is a continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier. Saprists, p. 484  BD. Other Histosols. Hemists, p. 480 pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (4): BA.Folists BB.Fibrists BC.Saprists BD.Hemists

BA.Folists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎

Key to Suborders  BA. Histosols that are saturated with water for less than 30 cumulative days during normal years (and are not artificially drained). Folists, p. 478  BA. These are the more or less freely drained Histosols that consist primarily of O horizons derived from leaf litter, twigs, and branches resting on rock or on fragmental materials that consist of gravel, stones, and boulders in which the interstices are filled or partly filled with organic materials. Plant roots grow only in the organic materials. Many of these soils are in very humid climates from the Tropics to high latitudes and high elevations. Some have an ustic or aridic (or torric) soil moisture regime. Most of the Folists in the United States are in Hawaii and Alaska. There are some Folists in the mountains in the western part of the United States, in the northern Lake States, and in the northeastern part of the United States.  Definition  Folists are the Histosols that are saturated with water for less than 30 cumulative days during normal years (and are not artificially drained).  Key to Great Groups  BAA. Folists that have a cryic soil temperature regime. Cryofolists, p. 478  BAB. Other Folists that have an aridic (or torric) soil moisture regime. Torrifolists, p. 479  BAC. Other Folists that have an ustic or xeric soil moisture regime. Ustifolists, p. 479  BAD. Other Folists. Udifolists, p. 479 pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (4): BAA.Cryofolists BAB.Torrifolists BAC.Ustifolists BAD.Udifolists

BB.Fibrists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎

Key to Suborders  BB. Other Histosols that: 1. Have more thickness of fibric soil materials than any other kind of organic soil material either:                 a. In the organic parts of the subsurface tier if there is no continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier; or                 b. In the combined thickness of the organic parts of the surface and subsurface tiers if there is a continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier; and 2. Do not have a sulfuric horizon that has its upper boundary within 50 cm of the soil surface; and 3. Do not have sulfidic materials within 100 cm of the soil surface. Fibrists, p. 474  BB. These are the wet Histosols in which the organic materials are only slightly decomposed. More than two-fifths or more than three-fourths (depending on solubility in a sodiumpyrophosphate solution) of the soil consists of fibers that remain after rubbing between the thumb and fingers. The botanic origin of the materials can be readily determined. The bulk density is commonly less than 0.1 g/cm3. Many Fibrists have ground water near the soil surface nearly all the time. A few areas of Fibrists are artificially drained. The level of the ground water fluctuates but seldom drops much below the bottom of the surface tier. Fibrists are of relatively small extent but occur from the Equator to latitudes with a cryic temperature regime. They are in closed depressions and in broad flat areas, such as coastal plains. Most are under natural vegetation.  Definition  Fibrists are the Histosols that: 1. Are saturated for 30 or more cumulative days or are artificially drained; and 2. Have fibric soil materials that are:                 a. Dominant in the organic part of the control section if there is a mineral layer (or layers) 40 cm or more thick that has its upper boundary in the subsurface tier, or if a densic, lithic, or paralithic contact occurs in the subsurface tier; or                 b. Dominant in the subsurface tier if there is no continuous mineral layer 40 cm or more thick that has its upper boundary in that tier; and 3. Do not have a sulfuric horizon that has its upper boundary within 50 cm of the soil surface; and 4. Do not have sulfidic materials within 100 cm of the soil surface.  Key to Great Groups  BBA. Fibrists that have a cryic soil temperature regime. Cryofibrists, p. 475  BBB. Other Fibrists in which fibric Sphagnum constitutes three-fourths or more of the volume to either a depth of 90 cm from the soil surface or to a densic, lithic, or paralithic contact, fragmental materials, or other mineral soil materials if at a depth of less than 90 cm. Sphagnofibrists, p. 477  BBC. Other Fibrists. Haplofibrists, p. 476 pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (3): BBA.Cryofibrists BBB.Sphagnofibrists BBC.Haplofibrists

BC.Saprists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎

Key to Suborders  BC. Other Histosols that have more thickness of sapric soil materials than any other kind of organic soil materials either: 1. In the organic parts of the subsurface tier if there is no continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier; or 2. In the combined thickness of the organic parts of the surface and subsurface tiers if there is a continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier. Saprists, p. 484  BC. These are the wet Histosols in which the organic materials are well decomposed. The botanic origin of the organic material is difficult to determine in most of these soils. The fiber content is less than one-sixth after rubbing between the thumb and fingers. Most of these soils have a bulk density of more than 0.2 g/cm3. Saprists occur in areas where the ground water table tends to fluctuate within the soils or in areas where the soils were aerobic during drier periods in the past. They consist of the residue that remains after the aerobic decomposition of organic matter. When drained, fibric and hemic materials commonly decompose to form sapric materials. If the organic materials are deep and are drained either artificially or naturally, the Fibrists and Hemists are converted after some decades to Saprists.  Definition  Saprists are the Histosols that: 1. Are saturated with water for 30 or more cumulative days during normal years (unless artificially drained); and 2. Have more thickness of sapric soil materials than any other kind of organic soil materials either:                 a. In the organic parts of the subsurface tier if there is no continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier; or                 b. In the combined thickness of the organic parts of the surface and subsurface tiers if there is a continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier.  Key to Great Groups  BCA. Saprists that have a sulfuric horizon that has its upper boundary within 50 cm of the soil surface. Sulfosaprists, p. 487 BCB. Other Saprists that have sulfidic materials within 100 cm of the soil surface. Sulfisaprists, p. 486  BCC. Other Saprists that have a cryic temperature regime. Cryosaprists, p. 484  BCD. Other Saprists. Haplosaprists, p. 485 pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (4): BCA.Sulfosaprists BCB.Sulfisaprists BCC.Cryosaprists BCD.Haplosaprists

BD.Hemists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎

Key to Suborders  BD. Other Histosols. Hemists, p. 480  BD. These are wet Histosols in which the organic materials are moderately decomposed. The botanic origin of much of the organic material cannot be readily determined. The fiber content of much of the organic material is between one-sixth and two-thirds after rubbing between the thumb and fingers. The bulk density commonly is between 0.1 and 0.2 g/cm3. Ground water is at or very close to the surface of these soils much of the time unless artificial drainage has been provided. The level of ground water may fluctuate but seldom drops much below the bottom of the surface tier. Hemists occur from the Equator to latitudes with a cryic temperature regime. They are in closed depressions and in broad flat areas, such as coastal plains and outwash plains. Most Hemists are under natural vegetation and are used as woodland, rangeland, or wildlife habitat. Some large areas of Hemists are cleared, drained, and used as cropland.  Definition  Hemists are the Histosols that: 1. Are saturated with water for 30 or more cumulative days during normal years (unless artificially drained); 2. Do not have more thickness of fibric soil materials and do not have more thickness of sapric soil materials than any other kind of organic soil material either:             a. In the organic parts of the subsurface tier if there is no continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier; or             b. In the combined thickness of the organic parts of the surface and subsurface tiers if there is a continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier; or 3. Have a sulfuric horizon that has its upper boundary within 50 cm of the soil surface, or sulfidic materials within 100 cm of the soil surface, and more thickness of fibric soil material than any other kind of organic soil material either:             a. In the organic parts of the subsurface tier if there is no continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier; or             b. In the combined thickness of the organic parts of the surface and subsurface tiers if there is a continuous mineral layer 40 cm or more thick that has its upper boundary within the subsurface tier.  Key to Great Groups  BDA. Hemists that have a sulfuric horizon that has its upper boundary within 50 cm of the soil surface. Sulfohemists, p. 483  BDB. Other Hemists that have sulfidic materials within 100 cm of the soil surface. Sulfihemists, p. 483  BDC. Other Hemists that have a horizon 2 cm or more thick in which humilluvic materials constitute one-half or more of the volume. Luvihemists, p.483  BDD. Other Hemists that have a cryic temperature regime. Cryohemists, p. 480  BDE. Other Hemists. Haplohemists, p. 481 pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (5): BDA.Sulfohemists BDB.Sulfihemists BDC.Luvihemists BDD.Cryohemists BDE.Haplohemists

BAA.Cryofolists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎BA.Folists‎ > ‎

Key to Great Groups  BAA. Folists that have a cryic soil temperature regime. Cryofolists, p. 478  BAA. These are the cold Folists. In the United States they occur mostly in southeastern Alaska, where the climate is cool, oceanic, and very humid. They are on gentle to very steep slopes. Their vegetation is primarily coniferous forests, and the only part of the soils in which there are plant roots is the O horizon. Beneath the O horizon, there may be a few centimeters of mineral soil material or none on hard rock or there may be fragmental materials consisting of gravel, stones, and boulders with the interstices filled or partly filled with organic materials.  Definition  Cryofolists are the Folists that have a cryic temperature regime.  Key to Subgroups  BAAA. Cryofolists that have a lithic contact within 50 cm of the soil surface. Lithic Cryofolists  BAAB. Other Cryofolists. Typic Cryofolists  Definition of Typic Cryofolists  Typic Cryofolists are the Cryofolists that do not have a lithic contact within 50 cm of the surface. pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (2): BAAA.Lithic Cryofolists BAAB.Typic Cryofolists

BAB.Torrifolists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎BA.Folists‎ > ‎

Key to Great Groups  BAB. Other Folists that have an aridic (or torric) soil moisture regime. Torrifolists, p. 479  BAB. These are the Folists that have a temperature regime warmer than cryic and an aridic (or torric) soil moisture regime. They occur in Hawaii, chiefly on lava flows in areas that receive little rainfall. The vegetation is mostly fountaingrass mixed with shrubs.  Definition  Torrifolists are the Folists that have a temperature regime warmer than cryic and an aridic (or torric) soil moisture regime.  Key to Subgroups  BABA. Torrifolists that have a lithic contact within 50 cm of the soil surface. Lithic Torrifolists  BABB. Other Torrifolists. Typic Torrifolists  Definition of Typic Torrifolists  Typic Torrifolists are the Torrifolists that do not have a lithic contact within 50 cm of the soil surface. pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (2): BABA.Lithic Torrifolists BABB.Typic Torrifolists

BAC.Ustifolists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎BA.Folists‎ > ‎

Key to Great Groups  BAC. Other Folists that have an ustic or xeric soil moisture regime. Ustifolists, p. 479  BAC. These are the Folists that have a temperature regime warmer than cryic and an ustic or xeric soil moisture regime. These soils have an O horizon overlying or in fragmental materials or directly overlying bedrock that is less than 50 cm from the surface.  Definition  Ustifolists are the Folists that have a temperature regime warmer than cryic and an ustic or xeric soil moisture regime.  Key to Subgroups  BACA. Ustifolists that have a lithic contact within 50 cm of the soil surface. Lithic Ustifolists  BACB. Other Ustifolists. Typic Ustifolists  Definition of Typic Ustifolists  Typic Ustifolists are the Ustifolists that do not have a lithic contact within 50 cm of the surface. pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (2): BACA.Lithic Ustifolists BACB.Typic Ustifolists

BAD.Udifolists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎BA.Folists‎ > ‎

Key to Great Groups  BAD. Other Folists. Udifolists, p. 479  BAD. These are the Folists that have a temperature regime warmer than cryic and a udic (or perudic) soil moisture regime. They occur in Hawaii, chiefly on lava flows in areas that receive very high amounts of well-distributed rainfall. The vegetation is mostly forest mixed with tree ferns.  Definition  Udifolists are the Folists that have: 1. A temperature regime warmer than cryic; 2. A udic (or perudic) soil moisture regime.  Key to Subgroups  BADA. Udifolists that have a lithic contact within 50 cm of the soil surface. Lithic Udifolists  BADB. Other Udifolists. Typic Udifolists  Definition of Typic Udifolists  Typic Udifolists are the Udifolists that do not have a lithic contact within 50 cm of the surface. pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (2): BADA.Lithic Udifolists BADB.Typic Udifolists

BBA.Cryofibrists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎BB.Fibrists‎ > ‎

Key to Great Groups  BBA. Fibrists that have a cryic soil temperature regime. Cryofibrists, p. 475  BBA. These are cold Fibrists. The fibers may be derived from any plant, woody or herbaceous. These soils may freeze during the winter, or they may have a climate in which the soils do not freeze during winter in normal years but are cold in summer. In either situation, the low temperatures limit the use of the soils. Most of these soils support native vegetation.  Definition  Cryofibrists are the Fibrists that have a cryic soil temperature regime.  Key to Subgroups  BBAA. Cryofibrists that have a layer of water within the control section, below the surface tier. Hydric Cryofibrists  BBAB. Other Cryofibrists that have a lithic contact within the control section. Lithic Cryofibrists  BBAC. Other Cryofibrists that have a mineral layer 30 cm or more thick that has its upper boundary within the control section, below the surface tier.Terric Cryofibrists  BBAD. Other Cryofibrists that have, within the organic materials, either one mineral layer 5 cm or more thick or two or more mineral layers of any thickness in the control section, below the surface tier. Fluvaquentic Cryofibrists  BBAE. Other Cryofibrists in which three-fourths or more of the fiber volume in the surface tier is derived from Sphagnum. Sphagnic Cryofibrists  BBAF. Other Cryofibrists. Typic Cryofibrists  Definition of Typic Cryofibrists  Typic Cryofibrists are the Cryofibrists that: 1. Do not have a layer of water within the control section, below the surface tier; 2. Have less than three-fourths of their fiber volume derived from Sphagnum in the surface tier; 3. Do not have a lithic contact within the control section; 4. Do not have a mineral layer between 5 and 30 cm thick or two or more thin, continuous mineral layers within the organic materials in the control section, below the surface tier; and 5. Do not have a mineral layer 30 cm or more thick that has its upper boundary below the surface tier and within the control section. pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (6): BBAA.Hydric Cryofibrists BBAB.Lithic Cryofibrists BBAC.Terric Cryofibrists BBAD.Fluvaquentic Cryofibrists BBAE.Sphagnic Cryofibrists BBAF.Typic Cryofibrists

BBB.Sphagnofibrists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎BB.Fibrists‎ > ‎

Key to Great Groups  BBB. Other Fibrists in which fibric Sphagnum constitutes three-fourths or more of the volume to either a depth of 90 cm from the soil surface or to a densic, lithic, or paralithic contact, fragmental materials, or other mineral soil materials if at a depth of less than 90 cm. Sphagnofibrists, p. 477  BBB. These are the Fibrists that were derived mainly from the various species of Sphagnum and associated herbaceous plants. At least three-fourths of the fibers, by volume, are Sphagnum in at least the upper 90 cm of the soil or throughout the soil if there is a densic, lithic, or paralithic contact shallower than 90 cm. A few of these soils have a mesic soil temperature regime that borders on frigid, but in general the soils are cool. Most of them have a frigid temperature regime. The structure of Sphagnum, with its water-holding cells, makes these soils unique, and for that reason they are grouped as Sphagnofibrists.  Definition  Sphagnofibrists are the Fibrists that: 1. Have three-fourths or more of their fiber volume derived from Sphagnum in the upper 90 cm or more of the control section, or above a densic, lithic, or paralithic contact, fragmental materials, or mineral soil shallower than 90 cm; 2. Have a mean annual soil temperature that is warmer than cryic.  Key to Subgroups  BBBA. Sphagnofibrists that have a layer of water within the control section, below the surface tier. Hydric Sphagnofibrists  BBBB. Other Sphagnofibrists that have a lithic contact within the control section. Lithic Sphagnofibrists  BBBC. Other Sphagnofibrists that have one or more limnic layers with a total thickness of 5 cm or more within the control section. Limnic Sphagnofibrists  BBBD. Other Sphagnofibrists that have a mineral layer 30 cm or more thick that has its upper boundary within the control section, below the surface tier. Terric Sphagnofibrists  BBBE. Other Sphagnofibrists that have, within the organic materials, either one mineral layer 5 cm or more thick or two or more mineral layers of any thickness in the control section, below the surface tier. Fluvaquentic Sphagnofibrists  BBBF. Other Sphagnofibrists that have one or more layers of hemic and sapric materials with a total thickness of 25 cm or more in the control section, below the surface tier. Hemic Sphagnofibrists  BBBG. Other Sphagnofibrists. Typic Sphagnofibrists  Definition of Typic Sphagnofibrists  Typic Sphagnofibrists are the Sphagnofibrists that: 1. Do not have a mineral layer between 5 and 30 cm thick or two or more thin, continuous mineral layers within the organic materials in the control section, below the surface tier; 2. Have a total of less than 25 cm hemic and sapric materials below the surface tier; 3. Do not have a layer of water within the control section, below the surface tier; 4. Do not have a limnic layer(s) 5 cm or more thick within the control section; 5. Do not have a lithic contact within the control section; and 6. Do not have a mineral layer 30 cm or more thick that has its upper boundary in the control section, below the surface tier. pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (7): BBBA.Hydric Sphagnofibrists BBBB.Lithic Sphagnofibrists BBBC.Limnic Sphagnofibrists BBBD.Terric SphagnofibristsBBBE.Fluvaquentic Sphagnofibrists BBBF.Hemic Sphagnofibrists BBBG.Typic Sphagnofibrists

BBC.Haplofibrists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎BB.Fibrists‎ > ‎

Key to Great Groups  BBC. Other Fibrists. Haplofibrists, p. 476  BBC. These are the Fibrists in which the temperature regime is warmer than cryic and less than three-fourths of the fiber volume is derived from Sphagnum. The fibers may have been derived from wood, grasses, sedges, mosses, and other herbaceous plants or from some combination of these. If these soils are drained and cultivated under the present technology, the organic materials will decompose either slowly or rapidly, depending on the management used and the temperature. Eventually, within some decades, the Haplofibrists that are drained and cultivated will be replaced first by Hemists and Saprists and then by mineral soils. Most of these soils in the United States support native vegetation.  Definition  Haplofibrists are the Fibrists that: 1. Have a soil temperature regime warmer than cryic; 2. Have less than three-fourths of their fiber volume derived from Sphagnum either in the upper 90 cm or more of the control section or in the soil above a densic, lithic, or paralithic contact, fragmental materials, or mineral soil materials shallower than 90 cm.  Key to Subgroups  BBCA. Haplofibrists that have a layer of water within the control section, below the surface tier. Hydric Haplofibrists  BBCB. Other Haplofibrists that have a lithic contact within the control section. Lithic Haplofibrists  BBCC. Other Haplofibrists that have one or more limnic layers with a total thickness of 5 cm or more within the control section. Limnic Haplofibrists  BBCD. Other Haplofibrists that have a mineral layer 30 cm or more thick that has its upper boundary within the control section, below the surface tier. Terric Haplofibrists  BBCE. Other Haplofibrists that have, within the organic materials, either one mineral layer 5 cm or more thick or two or more mineral layers of any thickness in the control section, below the surface tier. Fluvaquentic Haplofibrists  BBCF. Other Haplofibrists that have one or more layers of hemic and sapric materials with a total thickness of 25 cm or more in the control section, below the surface tier. Hemic Haplofibrists  BBCG. Other Haplofibrists. Typic Haplofibrists  Definition of Typic Haplofibrists  Typic Haplofibrists are the Haplofibrists that: 1. Have a total of less than 25 cm hemic and sapric materials below the surface tier; 2. Do not have a limnic layer(s) 5 cm or more thick within the control section; 3. Do not have a lithic contact within the control section; 4. Do not have a mineral layer between 5 and 30 cm thick or two or more thin, continuous mineral layers within the organic materials in the control section, below the surface tier; 5. Do not have a mineral layer 30 cm or more thick that has its upper boundary within the control section, below the surface tier; and 6. Do not have a layer of water within the control section, below the surface tier. pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (7): BBCA.Hydric Haplofibrists BBCB.Lithic Haplofibrists BBCC.Limnic Haplofibrists BBCD.Terric Haplofibrists BBCE.Fluvaquentic Haplofibrists BBCF.Hemic Haplofibrists BBCG.Typic Haplofibrists

BCA.Sulfosaprists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎BC.Saprists‎ > ‎

Key to Great Groups  BCA. Saprists that have a sulfuric horizon that has its upper boundary within 50 cm of the soil surface. Sulfosaprists, p. 487 BCA. These are the acid sulfate soils (cat clays) that consist of organic soil materials. They have a sulfuric horizon that formed as a consequence of draining the sulfidic materials. They are extremely acid and are toxic to most plants. They are mainly in drained coastal marshes or deltas near the mouths of rivers that carry sediments containing few or no carbonates. Most of these soils have an appreciable amount of mineral material within the control section.  Definition  Sulfosaprists are the Saprists that have a sulfuric horizon that has its upper boundary within 50 cm of the soil surface.  Key to Subgroups  BCAA. All Sulfosaprists (provisionally). Typic Sulfosaprists pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (1): BCAA.Typic Sulfosaprists

BCB.Sulfisaprists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎BC.Saprists‎ > ‎

Key to Great Groups  BCB. Other Saprists that have sulfidic materials within 100 cm of the soil surface. Sulfisaprists, p. 486  BCB. These are the potentially acid sulfate soils (cat clays) that consist of organic soil materials. They have sulfidic materials within 100 cm of the soil surface and have not been drained. They occur mainly in coastal marshes near the mouths of rivers or in the deltas of rivers that carry sediments with a low content of carbonates. The soils are locally extensive in the coastal marshes and deltas of some large rivers that drain humid regions.  Definition  Sulfisaprists are the Saprists that: 1. Do not have a sulfuric horizon that has its upper boundary within 50 cm of the soil surface; and 2. Have sulfidic materials within 100 cm of the soil surface.  Key to Subgroups  BCBA. Sulfisaprists that have a mineral layer 30 cm or more thick that has its upper boundary within the control section, below the surface tier.Terric Sulfisaprists  BCBB. Other Sulfisaprists. Typic Sulfisaprists  Definition of Typic Sulfisaprists  Typic Sulfisaprists are the Sulfisaprists that do not have a mineral layer 30 cm or more thick that has its upper boundary in the control section, below the surface tier. pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (2): BCBA.Terric Sulfisaprists BCBB.Typic Sulfisaprists

BCC.Cryosaprists

The Soils That We Classify‎ > ‎Soil Taxonomy 2nd Ed.1999‎ > ‎B.Histosols‎ > ‎BC.Saprists‎ > ‎

Key to Great Groups  BCC. Other Saprists that have a cryic temperature regime. Cryosaprists, p. 484  BCC. These are the cold Saprists that do not have a sulfuric horizon with its upper boundary within 50 cm of the soil surface and do not have sulfidic materials within 100 cm of the soil surface. They have a cryic temperature regime. These soils formed from many kinds of plant materials, including wood, moss, grass, and herbaceous materials. Some of these soils freeze during the winter, and some do not freeze. Those that do not freeze are insulated by snow cover or have a marine climate in which winters are mild and summers are very cool. Low soil temperatures in the summer limit the suitable crops where these soils are used as cropland. Most of these soils support native coniferous forest vegetation.  Definition  Cryosaprists are the Saprists that: 1. Have a cryic temperature regime; and 2. Do not have a sulfuric horizon that has its upper boundary within 50 cm of the soil surface; and 3. Do not have sulfidic materials within 100 cm of the soil surface.  Key to Subgroups  BCCA. Cryosaprists that have a lithic contact within the control section. Lithic Cryosaprists  BCCB. Other Cryosaprists that have a mineral layer 30 cm or more thick that has its upper boundary within the control section, below the surface tier.Terric Cryosaprists  BCCC. Other Cryosaprists that have, within the organic materials, either one mineral layer 5 cm or more thick or two or more mineral layers of any thickness in the control section, below the surface tier. Fluvaquentic Cryosaprists  BCCD. Other Cryosaprists. Typic Cryosaprists  Definition of Typic Cryosaprists  Typic Cryosaprists are the Cryosaprists that: 1. Do not have a lithic contact within the control section; 2. Do not have a mineral layer 30 cm or more thick that has its upper boundary in the control section, below the surface tier; and 3. Do not have a mineral layer between 5 and 30 cm thick or two or more thin, continuous mineral layers within the organic materials in the control section, below the surface tier. pages by <SoClaimon> sootin claimon : sootinc@gmail.com

Subpages (4): BCCA.Lithic Cryosaprists BCCB.Terric Cryosaprists BCCC.Fluvaquentic Cryosaprists BCCD.Typic Cryosaprists