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Although microbiotic crusts are known from many lowland deserts, they have apparently never been reported from alpine areas. This paper describes microbiotic crusts from an equatorial high Andean location (Páramo de Piedras Blancas) in Venezuela. The main objectives are to describe the basic characteristics of the crusts, to examine the properties of the soils on which they occur, and to discuss their...
Differences in soil texture, structure and water retention capacity between burnt and unburnt soils were studied in an area affected periodically by forest fires in SE Spain. The burnt and unburnt soils were sampled at altitudes ranging from 100 to 1000 m a.s.l., with slight differences in climate between the sampling sites. Comparisons were made at three levels: all-sites, between-sites and within-site...
At four study sites in northern Missouri the Farmdale and Sangamon paleosols, which are developed in loess, are welded to the underlying Yarmouth paleosol, developed in till. Upon initial examination, however, they appear to be a single, thick, continuous gleyed horizon (Gleysol). Along flat tabular drainage divides this welded solum is gleyed and is identical in all respects with the historical definition...
Macroporosity, pore shape and size distribution were analysed in samples collected during a field rain simulation campaign. Soils were a Typic Eutrochrept and a Typic Udorthent, eroded phase, under different crops and treatments (1 lucerne, 1 potato and 2 bare plots). In each plot, 2 rainfall simulations were made and soil samples for thin section analysis were collected. Soil macroporosity decreased...
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