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The concept of soil quality is relevant to a range of human-induced disturbances on soil; our objective was to examine the impact of clear-cutting on soil quality conditions in six Mixedwood (Populus tremuloides-Picea glauca) stands in Central Saskatchewan, Canada. Soil quality conditions at two short-term (1 to 5 years) and four medium-term (6 to 20 years) clear-cut sites were compared to eight...
The effects of acid deposition on cation release and key properties of two forest soils collected near Guiyang and Nanchang in southern China were studied in leaching experiments. Rebuilt soil columns consisting of three soil layers were exposed to five different leaching solutions, i.e. deionized water, two solutions with pH about 3.5 and two solutions with pH about 4.3. Salts (CaSO 4 ,...
This study was part of an ongoing characterization of soil properties of inland valleys (IVs) of West Africa. Soil sampling was done during 1982 to 1989. Soil properties of the topsoil (0-15 cm) were used to evaluate the fertility status of the various geographic regions.Large differences in soil fertility parameters were observed in the various geographic regions. Generally the drier regions [Sudan...
In mountainous areas soil characteristics may vary within short distances due to the relief. The scale of most soil maps is usually too coarse to take these variations into consideration, thus limiting their usefulness for technology development and extension. Field studies in southern Rwanda revealed that farmers have a profound knowledge of their soils, and classify soils for their own needs....
Serpentinite is a fairly common parent material for soils of the Alps and Apennines in Italy. In the Apennines these soils may show very different degrees of development even over small areas. This work was undertaken to study the pedogenesis on a soil catena occurring on a very small hill, with a particular attention to the clay mineral transformations. The catena is only 100 m long, but four...
Earthworm burrow systems are dynamic in nature; active earthworms create burrows, while other burrows disintegrate. Thin sections, made from soil samples taken at 2.5 and 22.5 cm depth in a chronosequence (0 to 7.3 yr) of burrow systems developed in a permanent pasture, were studied to assess the processes responsible for the disintegration of earthworm burrows over a prolonged time and to estimate...
The organic matter in density and particle size fractions of an Andisol and an Inceptisol has been characterised by its C and N contents and infrared spectra. The soils have a similar texture but different clay mineralogy and are under two contrasting land uses represented by pasture and cropping. The Andisol samples were taken from sites which have been under perennial pasture for 100 years and...
The geochemical characterization of ophiolitic soils in a temperate climate based on the nature of basic bedrock has been scarcely investigated. In this work we have taken into account major, minor and trace element data and clay, silt, sand and organic matter contents of ophiolitic soils collected from several places in Tuscany (Central Italy) where the chemical nature of the bedrocks is known....
The effects of temperature, time and cycles of drying and rewetting on the extractability of Zn added to a calcareous soil were studied by three successive extractions with DTPA. The concentrations of DTPA-extractable Zn increased linearly with the concentration of added Zn. The proportion of added Zn in the DTPA-extractable fraction decreased with increasing incubation time and with increasing...
Sediment enrichment and transport from a highly weathered, well-aggregated, and uniformly-textured soil were determined using field rainfall simulation. Overland flow on an agriculturally-managed ridge-and-furrow system was generated by applying four successive rainfall events: a dry run on bare soil with a rainfall intensity of 35 mm h −1 a wet run on bare soil with the same rainfall intensity,...
Samples of Fimus Soils — soils with a fimic epipedon according to the Chinese Soil Taxonomic Classification (ISS-AS) — were analyzed for extractable phosphorus using both the NaHCO 3 and citric acid methods. The latter method, required to distinguish “anthropic epipedons” (Soil Survey Staff) and the “fimic A horizon” (FAO) from other surface horizons, showed that the extractable P criterion...
Soil sampling and measurement often consume a significant portion of the budget available for a project. On a national or worldwide basis these activities require large investments, which are justified if the soil information leads to better decisions on land use or environmental issues to an extend which more than counterbalances the costs. This depends on both the costs and the quality of the information...
Soil samples were taken on sisal plantations in Tanga region (Tanzania) in order to investigate changes in soil chemical properties resulting from permanent cropping. Differences in soil fertility decline of eight Major Soil Groupings (FAO-Unesco) were evaluated by comparing (i) data from different soils under permanent cropping, (ii) data from the same soils under bush vegetation and permanent cropping,...
In many agricultural soils in the semi-arid and and mediterranean climates, exposure to cyclic wetting and drying (WD) can reduce aggregate stability. The extent to which soil pretreatment with coal-derived humic substances (HS) can increase aggregate stability in soils exposed to cyclic wetting and drying (WD) was evaluated in this study. The soils studied are an Acireale silty clay loam from Sicily,...
Evidence in the literature supporting the hypothesis that inputs of sea salts from the atmosphere increase soil pH and exchangeable Na + and Mg 2+ concentrations in soils in which the release of base cations by mineral weathering is slow is briefly reviewed. It is postulated that if a sea salt effect indeed occurs, long-term incubation of such soils in a field moist state should result...
Physical processes occurring during surface seal formation through a rainstorm are well understood, but limited information is available regarding the quantity and particle size distribution of splash and runoff at certain time intervals. In this study, we evaluated the quantity and particle size distribution of suspensions of both splash and interrill runoff in two loess soils with different mineralogy...
The chemical weathering of biotite and associated formation of secondary minerals has important implications for the genesis, mineralogy, chemical properties, and physical properties of soils and saprolites developed from biotite-rich parent rocks. In this study, we used a combination of X-ray diffraction, micromorphological, and scanning electron microscopy techniques to investigate biotite weathering...
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