Ustult

Ustult

[′üst‚əlt]
(geology)
A suborder of the soil order Ultisol; brownish or reddish, with low to moderate organic-carbon content; a well-drained soil of warm-temperate and tropical climates with moderate or low rainfall.
References in periodicals archive ?
The soils become Ustults in the middle-mountain forest (MF) of 800-1600 m a.s.1., which is covered with broad-leaved coniferous mixed forest, including Quercus glandulifera, Brevipetiolata spp., Castanea mollissima, Carpinus fargesiana, Rhododendron spp., and Ilex spp.
In the USDA Soil Taxonomy (Soil Survey Staff 2006), these soils would correspond to Alfisols (Xeralfs and to a lesser extent Aqualfs and Ustalfs) for the higher base status soils, and Ultisols (Ustults and to a lesser extent Aquults and Xerults) for the more acidic, lower base status soils.
The dominant suborders of Ultisols are Aquults, Humults, Udults, Ustults, and Xerults (Table 3-5).