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Mor humus is a form of forest floor humus occurring mostly in coniferous forests. [1] Mor humus consists of evergreen needles and woody debris that litter the forest floor. This litter is slow to decompose , in part due to their chemical composition (low pH, low nutrient content), but also because of the generally cool and wet conditions where ...
Terra preta soils also show higher quantities of nutrients, and a better retention of these nutrients, than surrounding infertile soils. [38] The proportion of P reaches 200–400 mg/kg. [ 51 ] The quantity of N is also higher in anthrosol, but that nutrient is immobilized because of the high proportion of C over N in the soil.
Alfisols of the world One of the environments in which Alfisols can develop is the Temperate deciduous forest. Alfisols are a soil order in USDA soil taxonomy. Alfisols form in semi-arid to humid areas, typically under a hardwood forest cover. They have a clay-enriched subsoil and relatively high native fertility. "Alf" refers to aluminium (Al ...
Moder is a forest floor type formed under mixed-wood and pure deciduous forests. [ 1 ] [ 2 ] Moder is a kind of humus whose properties are the transition between mor humus and mull humus types. [ 3 ] [ 4 ] Moders are similar to mors as they are made up of partially to fully humified organic components accumulated on the mineral soil.
Oxisols are a soil order in USDA soil taxonomy, best known for their occurrence in tropical rain forest within 25 degrees north and south of the Equator. In the World Reference Base for Soil Resources (WRB), [1] they belong mainly to the ferralsols, but some are plinthosols or nitisols. Some oxisols have been previously classified as laterite ...
Deforestation and forest area net change are not the same: the latter is the sum of all forest losses (deforestation) and all forest gains (forest expansion) in a given period. Net change, therefore, can be positive or negative, depending on whether gains exceed losses, or vice versa.
Soil is dry for at least half of the growing season and moist for less than 90 consecutive days; common in arid (desert-like) regions. Xeric: Soil moisture regime is found in Mediterranean-type climates, with cool, moist winters and warm, dry summers. Like the Ustic Regime, it is characterized as having long periods of drought in the summer.
Besides the superposition of different plants growing on the same soil, there is a lateral impact of the higher layers on adjacent plant communities, for example, at the edges of forests and bushes. This particular vegetation structure results in the growth of certain vegetation types such as forest mantle and margin communities. [citation needed]