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Soil formation under aerobic conditions usually enhances magnetic signals, mainly through neoformation of sub-micron magnetite and/or maghemite. In order to better understand the nature and magnitude of the enhancement, in this work we characterized the iron (Fe) oxides and magnetic properties of two Calcic Luvisols (Chromic) developed on calcareous orthoquartzites in a Spanish region with a warm...
Fragic soil properties often develop in thin loess units overlying residual parent materials in the midwest USA. Morphologic indicators of these fragic properties are often weakly expressed, making consistent mapping of soils difficult. This study was initiated in a small watershed in Union County, Illinois to determine location and degree of development of fragic materials and fragipans on the landscape...
Quantitative techniques for prediction and classification in soil survey are developing rapidly. The paper introduces application of Support Vector Machines in the estimate of values of soil properties and soil type classification based on known values of particular chemical and physical properties in sampled profiles. Comparison of proposed approach with other linear regression models shows that...
Biochar additions to soil can increase soil organic carbon (SOC) concentrations; however, minimal information is available on relationships with soil nitrogen (N) cycle. We hypothesized that biochar additions to sandy soils should be resistant to microbial mineralization in short-term studies but may prime organic carbon (OC) mineralization of fresh residue that promotes N immobilization. A laboratory...
The kinetics of Zn extraction by diethylenetriaminepentaacetic acid (DTPA) from the ≤2mm fraction of 12 calcareous soils was investigated using surface soil (0–30cm) samples. Soils were equilibrated with 0.005M, DTPA solution for 0.25 to 192h. Zero-, first-, second-, third-order, parabolic diffusion and simple Elovich equations did not adequately describe Zn extraction kinetics. The best model for...
Apart from imparting color characteristics, the precipitation and dissolution of Fe-oxides (and hydroxides) during pedogenesis is coeval with transformation and translocation of major and trace elements. Based on rock magnetic and geochemical parameters for 27 paleosol profiles from three stratigraphic columns of Pliocene–Pleistocene Siwalik sequence in the NW Himalaya, we describe here the relationship...
Using soil as a carbon sink to sequester carbon dioxide has attracted much attention. But there is little research on soil organic carbon (SOC) in the Loess Plateau because of the extremely complex topography. In this study, SOC storage was estimated based on a soil survey of a small catchment in the Loess Plateau, northwest China. The SOC content of 169 profiles and the bulk density of 12 profiles...
East central Kansas is largely comprised of alternating, level beds of Permian shale and limestone of the Central Plains, USA. Polygenetic upland soils of east central Kansas have been formed though multiple and likely different sets of soil forming factors. Upland soils in this region have a complex genesis, often contain one or more paleosols, and form in multiple parent materials including loess,...
Most of the pressures on peat soils that are responsible for their declining state are associated with human interventions, most notably land drainage for agriculture. Deteriorating stocks of peat soils and degradation of related ecosystem service flows have impacts not only on immediate users but also on society as a whole. It is important therefore that strategies to address these issues fully integrate...
The chemical and microbiological properties of the soil beneath the exotic species Lantana (Lantana camara Linn.) and its effect on the growth of three plant species were investigated to evaluate whether Lantana is a harmful invader in southern China. Soils were sampled from underneath (IN) Lantana canopy, on the edge of the canopy (ON) and 2–5m away (OUT) from the Lantana individuals. Soil chemical...
Highly-weathered clay mineralogical suites of Southeastern (U.S.) soils, which are exemplified in portions of upland, well-drained environments of the Piedmont and Atlantic and Gulf Coastal Plain, consist of kaolinite, hydroxy-interlayered vermiculite, gibbsite, iron oxides, and to a lesser extent, quartz, halloysite and mica. The development of these mineral assemblages is often coincident with Ultisol...
A lysimeter method was evaluated for its suitability in gas emission studies by studying the effect of temperature on CO 2 emissions (dark respiration) from cultivated peat soils. The study was carried out with organic soils from two locations in Sweden, a typical cultivated fen peat with low pH and high organic matter content (Örke) and a more uncommon fen peat with high pH and low organic...
The physical nature of sediment transport favors the movement of smaller and less dense materials, typically resulting in greater (enriched) sediment total phosphorus (TP) and organic matter (OM) concentrations than those of the parent soil. In rainfall–runoff, residue cover significantly influenced P enrichment, with the median TP enrichment ratio (TP ER ) for corn-grain (1.4) being significantly...
The present study investigated the effect of cultivation with or without inorganic fertilization, and farmyard manure (FYM), paddy straw (PS), and green manure (GM) along with inorganic fertilizers on soil aggregation, array and accessibility of aggregate associated C, specially the micro-scale location or stability of soil organic C (SOC) at 0–0.15, 0.15–0.30 and 0.30–0.45m depths on a silty clay...
Eolian mantles consisting of Quaternary loess, Holocene volcanic ash, and mixtures of the two are prominent features of most landscapes in the inland Pacific Northwest region of the USA. Soils of the loess-mantled Palouse region of eastern Washington and northern Idaho exhibit regional mineralogical trends related to mean annual precipitation and age. Clay content increases and CaCO 3 decreases...
Peatland drainage results in several environmental impacts such as release of greenhouse gas to the atmosphere and leaching of nutrients to watercourses. These hazardous environmental effects can partly be controlled with soil management, and different drainage and remediation practices. Grading is a new method developed for soils with low conductivity suffering from poor drainage, water logging and...
Historical drainage of peatlands across the East Anglian Fenlands has led to subsidence and degradation of the vast majority of the regional peat resource, to the extent that many areas can no longer be classified as peatland. Water-table management strategies have been introduced to reduce the rate at which these peatlands subside and physically and biochemically degrade. We assessed the rate of...
Soil organic carbon (SOC) plays an important role in maintaining and improving soil fertility and quality as well as mitigating climate change. Understanding SOC density spatial variability is fundamental for describing soil resources and predicting SOC. Three categories were used to create spatial scales: administrative category (county, city, province and region scale), soil taxonomic category (family,...
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