Ultisols are the dominant soils in the Southern United States (where the Cecil series is most famous), southeastern China, Southeast Asia, and some other subtropical and tropical areas.

my Mixed thermic, Typic paleudults （粘壤质，混合矿物的，热性的，典型的强发育湿润老成土土属），其中ult为Ultisols(老成土)的字根；ud表明该亚纲的土壤水分状况为湿润的(Udic)，其亚纲为湿润老成土；Pale表示该土壤的粘化层发育度高、深厚，为土类的修饰...

Udults are the more or less freely drained, relatively humus poor Ultisols that have a udic moisture regime. They are in southern and eastern parts of the country. Most of these soils currently support or formerly supported mixed forest vegetation.

Ultisols (from Latin ultimus, "last") are strongly leached, acid forest soils with relatively low native fertility. They are found primarily in humid temperate and tropical areas of the world, typically on older, stable landscapes.

Ultisols are reddish, clay-rich, acidic soils that support a mixed forest vegetation prior to cultivation. They are naturally suitable for forestry, can be made agriculturally productive with the application of lime and fertilizers, and are stable materials for construction projects.

1997年1月1日 · The central concept of Ultisols is a group of soils with an argillic or kandic horizon and a few basic cations that have developed under forest vegetation in humid climates. The chapter describes classifications and geographic distributions of Ultisols.

Ultisols (approx. 8% of ice-free land) are strongly weathered soils found in humid and relatively warmer regions of the temperate deciduous forest range, and are distinguished by relatively low base saturation and high acidity, and accumulation of simple clays in the subsurface B …

2024年8月1日 · Red soil (Ultisols) is developed under the action of a subtropical climate and evergreen broad-leaved forest worldwide. It is one of the typical low-yield soils in the tropical and subtropical regions of southern China (Cheng et al., 2017), accounting for approximately 36% of the total cultivated land in China (Huang et al., 2014).

2019年8月1日 · Ultisols make up about 8% of the world’s ice-free land surface. The soils are in humid areas. They formed from fairly intense weathering and leaching processes. They are basically acid soils in which most nutrients are concentrated in the upper few inches. They have a moderately low capacity to retain additions of lime and fertilizer. 9. OXISOLS

Ultisols are intensely weathered soils of warm and humid climates. They are typically formed on older geologic locations in parent material that is already extensively weathered. Ultisols have accumulated clay minerals in the B horizon.