Key to the FAO Soil Units 1974
ผ่านทางNatural Resources and Environment: Key to the FAO Soil Units 1974.
พฤศจิกายน 28, 2010
กุมภาพันธ์ 14, 2010
BBA.Cryofibrists (DinPuiThai)
BBA.Cryofibrists (DinPuiThai).
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.
BB.Fibrists (DinPuiThai)
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.
BADB.Typic Udifolists (DinPuiThai)
BADB.Typic Udifolists (DinPuiThai).
The central concept or Typic subgroup of Udifolists is fixed on soils that have organic materials resting on fragmental materials and filling or partly filling interstices in the fragmental materials, which consist of gravel, stones, and boulders. The soils on fragmental materials are not necessarily the most common in the great group, but they are classified as the Typic subgroup because the presence of shallow hard rock is used throughout this taxonomy to define lithic subgroups. These soils are of small extent in the State of Hawaii in the United States and are used as wildlife habitat.
BADA.Lithic Udifolists (DinPuiThai)
BADA.Lithic Udifolists (DinPuiThai).
The Lithic subgroup of Udifolists has organic materials resting on a lithic contact within 50 cm of the soil surface. These soils are of small extent in the State of Hawaii and on the Olympic Peninsula of Washington in the United States and are used as wildlife habitat.
BAD.Udifolists (DinPuiThai)
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.
BACB.Typic Ustifolists (DinPuiThai)
BACB.Typic Ustifolists (DinPuiThai).
The central concept or Typic subgroup of Ustifolists is fixed on soils that have organic materials resting on fragmental materials and filling or partly filling interstices in the fragmental materials, which consist of gravel, stones, and boulders. The soils on fragmental materials are not necessarily the most common in the great group, but they are classified as the Typic subgroup because the presence of shallow hard rock is used throughout this taxonomy to define lithic subgroups. These soils are of small extent in the State of Hawaii in the United States and are used as wildlife habitat.
BACA.Lithic Ustifolists (DinPuiThai)
BACA.Lithic Ustifolists (DinPuiThai).
The Lithic subgroup of Ustifolists has organic materials resting on a lithic contact within 50 cm of the soil surface. These soils are of small extent in the State of Hawaii in the United States and are used as wildlife habitat.
BAC.Ustifolists (DinPuiThai)
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.
BABB.Typic Torrifolists (DinPuiThai)
BABB.Typic Torrifolists (DinPuiThai).
The central concept or Typic subgroup of Torrifolists is fixed on soils that have organic materials resting on fragmental materials and filling or partly filling interstices in the fragmental materials, which consist of gravel, stones, and boulders. The soils on fragmental materials are not necessarily the most common in the great group, but they are classified as the Typic subgroup because the presence of shallow hard rock is used throughout this taxonomy to define lithic subgroups. These soils are of small extent in the State of Hawaii in the United States and are used as wildlife habitat.
BABA.Lithic Torrifolists (DinPuiThai)
BABA.Lithic Torrifolists (DinPuiThai).
The Lithic subgroup of Torrifolists has organic materials resting on a lithic contact within 50 cm of the soil surface. These soils are of small extent in the State of Hawaii in the United States and are used as wildlife habitat.
BAB.Torrifolists (DinPuiThai)
BAB.Torrifolists (DinPuiThai).
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.
BAAB.Typic Cryofolists (DinPuiThai)
BAAB.Typic Cryofolists (DinPuiThai).
The central concept or Typic subgroup of Cryofolists is fixed on soils that have organic materials resting on fragmental materials and filling or partly filling interstices in the fragmental materials, which consist of gravel, stones, and boulders. The soils on fragmental materials are not necessarily the most common in the great group, but they are classified as the Typic subgroup because the presence of shallow hard rock is used throughout this taxonomy to define lithic subgroups
BAAA.Lithic Cryofolists (DinPuiThai)
BAAA.Lithic Cryofolists (DinPuiThai).
The Lithic subgroup of Cryofolists has organic materials that rest on a lithic contact within 50 cm of the soil surface. Lithic Cryofolists are of small extent. They occur on the Olympic Peninsula in the United States. These soils are used as either woodland or wildlife habitat.
BAA.Cryofolists (DinPuiThai)
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.
