Floodplain Soil

Floodplain Soil

 

a soil formed on the alluvial deposits of the floodplains of major rivers. Floodplain soils are distinguished by the presence of a large number of organisms, stratification, and the existence of buried humus horizons.

Varying processes of soil formation yield different types of floodplain soils. Soddy soils form beneath grass-forb meadows and light forests along floodplain levees and ridges. They are distinguished by a light texture and an unstable water regime resulting from high water and precipitation. Meadow soils form in the central part of the floodplain beneath forb-grass vegetation, where the surface and capillary fringe have a great deal of moisture. They are characterized by significant humus accumulation, grainy structure, development of gley in the lower horizons, and new hydrogenic formations (for example, ferromagnesium). Marsh soils form in the part of the floodplain near the terrace beneath grassy and wooded (alder) marshes and are confined to negative landforms (for example, depressions). They are distinguished by silting and bog formation. In the forest zone, there is intensive development of gley, and in the forest-steppe, steppe, and desert zones, the soils become impoverished by salin-ization and insufficient lime content.

Floodplain soils are found in diverse natural zones. They are fertile and are used as meadowlands and for raising vegetables, feed crops, rice, and other crops. Floodplain soils require regulation of water conditions (drainage and irrigation).

REFERENCE

Shrag, V. I. Poimennye pochvy, ikh melioratsiia i sel’skokhoziaistvennoe ispol’zovanie. Moscow, 1969.

G. V. DOBROVOL’SKII

References in periodicals archive ?
A comparison of growth rates of naturally established saplings during 1998-2004 suggests that floodplain soil fertility at BP is at least as favorable for cottonwood growth as the levels at DLP (Andersen, 2005).
General soil type###Non-Calcareous Dark Grey Floodplain Soil###Non-Calcareous Dark Grey Floodplain Soil
to be present on six widespread floodplain soil series (Eel, Gesesee, Morganfield, Pope, Ross, and Shoals), ranging from 7-33% of stand importance on different soils; sugar maple to be present on four soil series (Eel, Genesee, Pope, and Ross), at 7-20% importance; and tulip tree on three (Eel, Morganfield, and Pope), at 5-7% importance.
In contrast, the dominant clay-sized minerals of the floodplain soil surrounding each of the sand dunes are quartz, smectite, and kaolinite (Cattle et al.
The floodplain soil is a moderately well-drained Lobdell silt loam, which has a high available water capacity and high water table (Wright et al.
One cleanup option presented previously would involve focusing on the removal of contaminated sediment and floodplain soil from all hot spot areas that show the highest levels of contamination.
The groundwater table is also lower and the soil texture less uniform than the floodplain soil profiles.
The former determines the natural flow regime, a key factor determining disturbance as well as moisture content of floodplain soil, whereas the latter also influences soil moisture and strongly affects riparian soil and air temperatures.
The highest phosphorus solubilization was observed in Old Brahmaputra Floodplain soil (AEZ-9) and the lowest phosphorus solubilization was found in High Ganges River Floodplain (AEZ-11).
In the Macleay catchment, Walker (1961, 1963) conducted seminal work on floodplain soil and groundwater conditions, recognising ASS as partially oxidised estuarine sediments or 'katteklei'.
Saric and Cynthia Draper, a representative of AMEC; an engineering company hired to lead the cleanup of the river from the Morrow Dam in Comstock Township to the the former Plainwell Dam; presented a host of options for cleanup of the site that ranged from taking no further action, to completely removing nearly all highly contaminated sediment and floodplain soil.
The plan also proposed excavating an estimated 150,000 cubic yards of contaminated floodplain soil located downstream of the former facility property.