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The reduction of forest floor ground cover and litter layers by prescribed fires may alter the morphology (field and micro) and physical properties of surface horizons. This study determined long-term (35 yr) changes in surface horizon bulk density, organic matter concentration and content, and morphology in response to periodic (5 yr) and annual (1 yr) prescribed fires. Soils were fine-silty, siliceous,...
Vertisols formed on different parent materials from Turkey (Aslanpinari and Begdes soil series) and Israel (Akko soil series) were studied for their microstructure. The Aslanpinari and Begdes soils showed similar spheroidal microstructural development in the ABss horizons, whereas the spheres of Akko differed by being smaller and lacking granostriation. Micromorphometric analyses of the three soils...
This study was undertaken as a preliminary investigation on the genesis of the most extensive soils in north-central Portugal. Six pedons covering a range of parent materials and field morphology were selected in the study area. Their characterization included field morphology, physico-chemical routine analyses, clay mineralogy, heavy minerals in the fine sand and micromorphology.The data obtained...
Cells of Pseudomonas fluorescens, stained with a fluorescent brightner, calcofluor white M2R, were introduced into soil aggregates at specific matric potentials. The soil was impregnated with resin and the hardened blocks cut and polished. The inocula, dispersed through the pore network as single cells, were observed to be located in soil pores of a particular size class, determined by the antecedent...
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