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This soil monolith production method, initially developed in the late 1990s, has now been successfully applied to over 100 soil profiles, dealing with the majority of Australian soils ranging from clays to sands, from uniform to texture contrast profiles, and from alkaline soils to even acid sulphate soils. The method outlined utilises intact soil profiles (150 mm diameter undisturbed soil cores collected...
Due to landscaping, mining and construction activities on previously cultivated land, more and more soils are excavated, translocated, deposited and restored. In many cases restored soils show signs of structural degradation such as overcompaction and water logging. There is a lack of methods to evaluate and assess the physical quality of restored soil. In this study a fuzzy logic expert system was...
Soil organic matter is the most important factor controlling aggregation processes in many soils, but studies on clayey soils have reported contradictory results. This study explored the formation of water stable aggregates in a Pellic-vertisol [FAO (1998). World Reference Base for Soil Resource. World Soil Resource Reports vol. 84. Rome.] or fine to very-fine Udic Haplusterts [Soil Survey Staff....
Permanent wilting point (PWP) is an important soil water parameter available from the soil water retention curve. Soil water content held at 1500 kPa determines plant survival or death. Recently, the application of fractal geometry concepts has been widely used for modeling soil and its hydraulic properties (e.g. soil water retention curve and unsaturated hydraulic conductivity). The objective of...
Soil erosion rates are quantified using the fallout radionuclide (caesium-137) approach and models (empirical RUSLE and physically based SIBERIA) for a small catchment in south-eastern Australia. Two hillslope transects (under native grass) were sampled for 137 Cs activity and soil redistribution rates were determined using empirical and theoretical conversion methods. These soil redistribution...
Digital soil mapping in mountain areas faces two major limitations: the small number of available observations and the non-linearity of the relations between environmental variables and soil properties.A possible approach to deal with these limitations involves the use of non-parametric models to interpolate soil properties of interest. Among the different approaches currently available, Support Vector...
Calcite equilibrium characterisation of soil solutions is needed in order to provide soil salinity modellers with reliable solubility constants in solutions where the hypothesis of equilibrium can be accepted.A total of 134 soil samples were taken from 39 sites at 2, 3, or 4 depths per site, down to a maximum depth of 95 cm, during a survey in the irrigated agricultural area of the Segura River Lowland...
A popular method for fitting solid-phase activity coefficient models in the thermodynamics of ternary ion-exchange has been the Rational method. The standard statistical tests used to compare model functional forms are undefined in the Rational method because all of the dependent variables in the regression (Gibbs Energies) take the value of zero. The present study develops the mathematically equivalent...
The saturated hydraulic conductivity (K s ) of sulfuric horizons exerts a fundamental control on the connectivity between shallow groundwater and drains in coastal acid sulfate soils (CASS), strongly influencing rates of lateral seepage towards or from field drains. The K s of sulfuric horizons was assessed on seven major coastal floodplains of eastern Australia using an in situ recovery...
We studied the effects of land-use and land-cover changes on physical and chemical properties of soil in tropical South-East Mexico. In the study area of about 5500 km 2 , the dominant land use is pastureland (Pa seasonal agriculture (TA), fruit plantations (FP), sugarcane, (SC) secondary (SF) and primary forest (PF) and other not specified land-use types (undefined). From 1988 to 2003 severe...
Phytoliths are minerals of amorphous silicon dioxide forming in cell lumina and intercellular spaces of living plants. Because of their morphological specificity and their stability in soils phytoliths have been widely used in paleoenvironmental reconstructions. However, the mechanisms of phytolith displacement in soil are not well understood, which causes uncertainties in the interpretation of phytolith...
The objective of this study was to test the availability of the boron from doped oxides to rape (Brassica napus L.), and the effect of the boron doped oxides on soil acidosis. The soil was treated with goethite, manganite and their boron-containing oxides including iron oxide with adsorbed boron (i.e. ad-B-goethite), iron oxide with occluded boron (i.e. oc-B-goethite), manganese oxide with adsorbed...
Deposition and storage of fine sediment on channel beds can represent an important component of catchment sediment budgets and can therefore have implications for particulate phosphorus (PP) transfers. Accordingly, spatial and temporal variations in the phosphorus (P) content of fine (<63 μm) bed sediment and associated P storage have been studied in three UK lowland permeable catchments, the Pang...
Where precipitation is ample (udic moisture regimes) and evidence of illuviation clear, argillic-horizon genesis is often easily understood. In drier climates (aridic to ustic), argillic horizons are often interpreted as relict features of the Pleistocene. However, in high montane, western landscapes where climate falls in between these two extremes, the role of aeolian clay inputs vs. in-situ weathering...
Soil solutions at 15 cm and 60 cm depths under a Korean pine and broadleaf mixed forest (>200 years old) at Changbai mountain, northeast China, were sampled using porous ceramic suction cups from July 2006 to October 2007, to study the effects of nitrogen (N) addition on the concentrations of dissolved nitrous oxide (N 2 O) and carbon dioxide (CO 2 ), dissolved organic matter and...
A total of 96 street dusts and 96 roadside soils have been sampled from three different localities (urban, industrial, peripheral) of the city of Kavala (Greece) and analyzed for Pb, Cu, Zn, Ni, Cr, Cd, As and Hg using the atomic absorption spectrophotometric method. Results showed that dust and soil samples from the urban and industrial area contained significant levels of the metals studied compared...
Nitrogen-fixing plants alter the chemical properties of the soil beneath plant canopies, particularly by concentrating nitrogen-rich organic matter. We hypothesize that the presence of a legume canopy inside a plot will more greatly influence the spatial structure of soil nitrogen (N) than phosphorus (P). We also investigated whether the effects of legume individuals on the soil properties beneath...
Fe oxide-impregnated paper (Pi-paper) is used as an artificial Phosphorus (P) sink to study P availability in soils and runoff. Pi-papers were introduced as they would mimic P uptake by plant roots by decreasing the P concentration in solution to negligibly low levels and thus enhancing P desorption from the soils solid phase. The rate of transfer of P from soil to Pi-paper would thus be limited by...
In low input farming systems the reserves of organic and inorganic P may be a significant source of P to crops. To clarify this we investigated organic and inorganic P reserves in an array of irrigated and rain-fed calcareous soils of grassy crops, with long term organic or conventional farming practices. Organic P (Po) reserves appeared to be more sensitive than inorganic P reserves to changes in...
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