Soil Complex

soil complex

[¦sȯil ¦käm‚pleks]
A mapping unit used in detailed soil surveys; consists of two or more recognized classifications.

Soil Complex


mosaic soil cover consisting of alternating small areas (patches) of soils of different types; the patches alternate with each other every few meters (more rarely, dozens of meters) and are repeated over and over again.

This alternation of soil is most often observed in the chestnut and brown semidesert soil zone, where comparatively small variations in moisture, usually related to microrelief, cause sharp changes in conditions of development for soils and vegetation. The number of types of soils in the soil complex may differ; complexes with two and three types are most common. The soils that are part of the complexes are usually sharply different in the nature of their formation, although they are closely interrelated in origin. For the most part the boundaries between patches of different soils are very clearly defined. The economic importance of soil complexes is determined by the properties of the complex as a whole and by the properties of the poorest soils in the complex, because the separate patches occupied by the different soils in the soil complex are so small as to be insignificant from an economic point of view.


Fridland, V. M. Struktura pochvennogo pokrova. Moscow, 1972.
References in periodicals archive ?
Therefore, we took the opportunity of using soil samples collected in three different years from the dominant soil complex in an existing long-term grazing trial established in 1997 (O'Reagain et al.
2011) explained the higher SOC in the HSR on this soil complex by a lower [delta][sup.
Therefore, we quantified the effect of tillage (conventional-till, no-till, and paratill) and residue management systems on runoff and soil loss from a Plinthic Paleudult-Typic Hapludult soil complex.
The soil complex is classified as coarse-loamy, siliceous, thermic, Plinthic Paleudult-Typic Hapludult.
Sediment delivery from this soil complex is dependent upon the transportability of surface soil particles, which are dominated by sandsized particles from the plot.
For the Hurunui site, Tonkin (1984) subdivided spurs into 3 different soil-landscape components: a soil complex for areas with varying roughness and frequent bedrock outcrops: and 2 catenas developed in spur areas with high and low surface roughness.
Part 1 of 2] Stratigraphic Unit Average Thickness of Deposit Unit 7 Modern O-A-E Horizons 5-7 cm Unit 6 Modern B Horizon 15-20 cm Unit 5 Buried Forest Soil complex 15-20 cm Unit 4 Sand 25-30 cm Unit 3 Silver Sand 5 cm Unit 2 Lower Loess with Paleosol Stringer 25-30 cm Unit 1 Outwash Gravels ?
The higher the exchangeable sodium percentage (ESP) of the soil complex, the greater should be the addition of salts to enhance the electrical conductivity (EC) of the percolating water and so to maintain the EC above the flocculation value (van Olphen 1977; Frenkel et al.
A similar procedure was followed to represent inclusions of soils, constituents of a soil complex, and the representative soil used to explain a soil consociation (see the relationship types CONSISTS__OF, COMPOSED__OF, and HAS INCLUSIONS__OF in Figure 2).