The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The evaporation method is an easy and reliable procedure for measuring soil hydraulic properties. Inverse modelling has been used to analyse the evaporation data facilitating the prediction of soil hydraulic properties. The conventional approach to solve the inverse solution is the use of the nonlinear least-squares (NLLS) technique. A major problem with such inverse modelling approaches is nonidentifiability,...
Hydraulic conductivity is an important parameter of water and solute transport in soils. Hydraulic conductivity is known to be highly variable in space, but its dependence on soil horizonation has seldom been explored. We measured the near-saturated hydraulic conductivity of three soils located in the Centre of France, a Néoluvisol, a Calcisol, and a Calcosol (according to the “Référentiel Pédologique”),...
This study examines whether changes from grassy to woody vegetation coincide with the initiation of European farming practices (last 50–150 years) in central Queensland, using a site where historical records suggest invasion of woody vegetation (Acacia sp.). Soil samples were taken along a transect, spanning the transition between C4-dominated grassland and C3-dominated woodland. We utilize δ ...
10 Be concentrations of six soils on the raised coral reef terraces of Kikai Island, southwest Japan range from 0.80 to 7.17×10 9 atoms g −1 . The annual deposition rate of 10 Be from the atmosphere to Kikai Island from 2000 to 2002 ranges from 2.0 to 3.5×10 6 atoms cm −2 year −1 , with a mean of 2.8±0.7×10 6 atoms cm −2 year ...
The upland soils of Carajás and Paragominas in eastern Brazilian Amazonia are made up of yellow to reddish earthy-clayey to clayey materials, which cover iron–aluminum, aluminum–iron and aluminum lateritic crusts. These materials are closely related to each other and to lateritic evolution and are comprised by three horizons described from the base to the top as lower, intermediary and upper horizons...
Efficient tools to measure within-field spatial variation in soil are important when establishing agricultural field trials and in precision farming. The object of the study was to investigate if a combination of two techniques, principal component analysis (PCA) and geostatistics, could reveal spatial soil variation from near infrared reflectance (NIR) spectroscopy data and thereby replace more conventional,...
Geochemical barriers (GBs) are defined as a local epigenetic zone where the conditions of elemental migration are distinctly altered, resulting in a substantial accumulation of selected elements. It is of great importance to understand the local distribution pattern of elements and their availability affected by local factors. A soil survey of two predominant landscapes, an arid desert landscape and...
Soil formation factors such as lateral and base water flows promote the Oxisol–Ultisol transformation on hillslopes in colluvium material with oxic properties. Chemical and electrochemical processes occur simultaneously with the morphological transformation of the soil structure from very fine granular to blocky soil. Statistical analysis techniques, such as principal component analysis (PCA) and...
The two main sources of Ca in forest ecosystems are mineral weathering release and atmospheric inputs. We use the 87 Sr/ 86 Sr isotopic ratio (Sr is used as a proxy for Ca) to determine the Ca contribution from atmospheric deposition input in two forest ecosystems (beech stands) growing on soils formed from parent materials with contrasting total Ca contents and isotopic ratios: Pleistocene...
The effect of polychromatic UV and visible light on the radical properties of humic acid (HA) extracted from composted shells of walnut tree Juglans regia was investigated. The exposure of HA solutions 2 mg/ml in 0.01 M Na 2 CO 3 at pH=10.8 to the light from a 150-W xenon lamp increases the signal amplitude of electron paramagnetic resonance (EPR). Using the set of cut-off filters...
Vegetation type has a profound influence over biogeochemical processes, including canopy leaching, stemflow, litterfall, and nutrient uptake. Understanding the relationship between plants and soil processes, such as mineral weathering, is a difficult task considering the interactions among biotic and abiotic soil-forming factors. In this study, soils planted with pure stands of scrub oak (Quercus...
Mesquite trees in desert grasslands create localized distributions of soil N, C, and P, through N fixation, nutrient uptake, and subsequent litterfall. Fires may prevent or reverse this accumulation, but the results of this process are poorly understood. Our objectives were to (1) characterize temporal and spatial variation in velvet mesquite litter mass and C, N, and P concentration; (2) characterize...
Peat humic and fulvic acids were isolated from a surface horizon (0–60 cm) and deeper horizon (>60 cm) of an ombrotrophic peat bog located in Galicia (NW Spain) and which constitutes a record of paleoenvironmental contamination. The humic and fulvic acids were characterized and compared using chemical methods and spectroscopic techniques, including ultraviolet visible (UV-vis), Fourier transform...
Soil mechanical resistance to penetration by roots can potentially contribute to the spatial and temporal variability in root and shoot growth. Functions that accurately relate penetrometer resistance to soil properties are important tools for assessing the contribution of soil mechanical resistance (SMR) when the temporal and spatial variability in SMR cannot be readily measured. Although effective...
Soil water repellency has important consequences for hydrological and ecological properties of forest soils. It is a dynamic property, varying temporally throughout the course of the year. The objective of this study was to characterize the temporal variation of soil water repellency on sites at the Kahlenberg forest in northeast Germany, with comparable geological substrate, soil type, and climatic...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.