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The Salt Basin of Lancaster County, Nebraska is distinguished by the presence of ephemeral to semi-permanent saline wetlands, salt flats, surface accumulations of salt, zones of bacterial sulfate reduction in wetland soils and stream sediments, and soil cryptogam layers. Salt flat soils are unique in the region and have laminated surface horizons, which probably result from a combination of soil crusting,...
Erosion modeling techniques provide a framework for the evaluation of agricultural impacts on soil and water resources. Agricultural policies or economic incentives generally induce land use changes or even agricultural crop rotation changes. This results in a different erosional behavior of cultivated soil. Besides economic benefits, the sustainability of the agricultural practices with regard to...
Greyzems (Grey Forest Soils) are zonal soils of the forest-steppe, in Russia geographically situated between the (Podzo) Luvisols of the southern taiga forest and the (Luvic) Chernozems of the steppe. Greyzems are characterized by a dark mollic horizon, with uncoated (bleached) silt and sand grains on pedfaces, and an argic horizon as diagnostic horizons. The FAO-Unesco soil map of the world shows...
The structure of many clay soils in tropical Africa is composed of microaggregates that range in size from 0.03 to 1 mm. These structural units are often very stable and known as pseudo-sand or pseudo-silt; their presence is detected from the loamy feel of the soil. This paper tests the hypothesis that termites contribute to a stable microgranular, i.e., finely aggregated, soil structure. A termite...
A paleosol with Mousterian tools in aeolianites at the Habonim site (Carmel Coastal plain, Israel) is a complex pedosedimentary sequence which records a succession of soil-forming episodes and stages of coastal dune instability. We identified three strong soils and one accretionary soil within Mousterian pedocomplex via micromorphological techniques, coupled with FTIR and SEM/EDAX. In the lowermost,...
This paper addresses the issue of incorporating a digital elevation model into the mapping of annual and monthly erosivity values in the Algarve region (Portugal). Besides linear regression of erosivity against elevation, three geostatistical algorithms are introduced: simple kriging with varying local means (SKlm), kriging with an external drift (KED) and colocated cokriging. Cross validation indicates...
A prediction model of shallow landsliding is proposed. It considers not only the deterministic aspects containing slope stability, saturated throughflow and a soil (regolith) depth development, but also the stochastic aspects of intensity and duration of rainfall. It turns out that the probability of saturated throughflow, which is the direct trigger mechanism to shallow landsliding, can be expressed...
A large amount of Quaternary palaeo-environmental evidence lies within the terrestrial aeolian sediments filling the Duero basin in central Spain. Previous work has identified a number of stratigraphical units although the absolute age and origin of some of these is equivocal. The uppermost unit, the focus of this paper, is a widely distributed sand which covers most of the Tierra de Pinares, north...
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