A gleysol or gley soil is a hydric soil that unless drained is saturated with groundwater for long enough to develop a characteristic gleyic colour pattern.

Gleysol, one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO). Gleysols are formed under waterlogged conditions produced by rising groundwater. In the tropics and subtropics they are cultivated for rice or, after drainage, for field crops and trees.

Gleysols occupy an estimated 720 million hectares worldwide. They are azonal soils and occur in nearly all climates, from perhumid to arid. The largest extent of Gleysols is in sub-arctic areas in northern Rus-sia, Siberia, Canada and Alaska, and in humid temperate and subtropical lowlands, e.g. in China and Bangladesh.

本土纲相当于美国土壤系统分类的新成土纲（Entisol）、始成土纲（Inceptisol）、有机土纲（Histosol），联合国土壤分类的始成土（Cambisols）、潜育土（Gleysols）、粗骨土（Regosols）、有机土。

Gleysols occur throughout the world where groundwater comes near to the surface, causing soils to become wet for a prolonged part of the year. They are particularly abundant in the low-lying river basins. Soils having gleyic properties (properties associated with prolonged wetness) within 50 cm from the soil surface.

Gleysols are characterized by subsurface horizons with prominent redoximorphic features formed by intermittent to long-term dysoxia or anoxia. Features indicative of redoximorphic conditions include low chroma (gray, green) soil matrix colors and reduced iron-bearing minerals (e.g., pyrite) and/or iron/manganese oxides occurring as pore linings ...

2017年10月1日 · Gleysols occur on a wide range of unconsolidated materials, mainly fluvial, basic to acidic marine to lacustrine sediments of Pleistocene or Holocene age, nearly in all climatic regions. Similar to organic soils they are found in depression areas and low landscape positions with shallow groundwater in almost all geological parent materials ...

2011年4月19日 · Gleysolic soils are found throughout Canada, either in low-lying landscape positions in association with better-drained soil orders (e.g., Prairie Pothole region), or as the dominant soil type where topography and/or a slowly permeable substrate prolong the period of saturation (e.g., Clay Belt of northern Ontario and Quebec).

2021年2月20日 · Gley Soils form in areas where the soil is saturated as a result of periodic or permanent ground- or perched-water tables. Gley Soils occur in predominantly mineral parent materials as distinct from Organic Soils that form from …

Gleysols comprise soils saturated with groundwater for long enough periods to develop reducing conditions resulting in gleyic properties, including underwater and tidal soils. This pattern is essentially made up of reddish, brownish or yellowish colours at aggregate surfaces and/or in the upper soil layers, in combination with greyish/bluish ...