Showing papers in "Geoderma in 2001"

TL;DR: Two new criteria (exceedence probability plot and narrowness of probability intervals that include the true values) are presented to assess the accuracy and precision of local uncertainty models using cross-validation.

TL;DR: In this paper, the content of LMW carboxylic acids in soil solutions collected by centrifugation and in lysimeters, and soil extracts in relation to type of vegetation, soil type and soil depth are presented.

TL;DR: In this paper, the most common isotherm equations used in soil science are classified into rational, power, and transcendental functions which are related to the classification of isotherms.

TL;DR: In this paper, the accuracy of digital elevation models (DEM) and DEM-derived products depends on several factors, including the horizontal resolution and vertical precision at which the elevation data are represented, and the source of elevation data.

TL;DR: In this article, the authors studied the thermodynamics and kinetics of soil-property change and found that the direction of change can be determined from measures of disequilibrium, i.e., when a shift in the external environment does not produce any pedogenic change even though one is expected, the soil is said to be in a state of pedogenic inertia.

TL;DR: A review of three families of statistically based models of soil variation that are currently in use and trace their development since the mid-1960s, which considers classification and geostatistics for modelling the spatial variation, time series analysis and physically based approaches for modelling temporal variation, and space–time Kalman filtering for predicting soil conditions in space and time simultaneously.

TL;DR: In this article, the authors compare various prediction methods for mapping of soil cation exchange capacity using different combinations of secondary information, such as terrain attributes, bare soil color aerial photograph, LANDSAT TM imagery, crop yield data and soil apparent electrical conductivity (ECa), using a modification of jackknifing as the validation method.

TL;DR: In this article, three standard humic acids (Suwannee River, soil, and peat) were titrated at pH 5 and 7 with I2 as an oxidant under an inert Ar atmosphere at 25°C.

TL;DR: In this paper, the influence of climate and vegetation (oak, manzanita, and conifers) on SOM composition in granitic-derived soils from California were compared to soils with varying climate along an elevational transect in the Sierra Nevada range.

TL;DR: In this paper, the mean residence time (MRT) of soil organic carbon (SOC) on different soil types and management regimes is determined by carbon dating the total soil together with acid hydrolysis and carbon dating of the non-hydrolyzable residue (NHC).

TL;DR: In this paper, the effect of clay mineralogy on the amount and composition of organic matter that is bound to the mineral surface was investigated, focusing on organic matter associated with kaolinite and smectite.

TL;DR: In this paper, the authors determined the aggregate stability in Ultisols from subtropical China applying the Le Bisssonais Method and determined the effect of initial aggregate size on its stability.

TL;DR: In this paper, the authors investigated the differences in soil organic matter (SOM) composition in consecutive soil profiles (under algae, grass, moss, heather and pine) from a primary vegetation succession (central Netherlands) were investigated by Cross Polarization-Magic Angle Spinning (CPMAS) 13C NMR, chemical degradation (acid hydrolysis of polysaccharides) and pyrolysis-GC/MS in relation to the vegetation.

TL;DR: In this paper, a process-based terrain characterization model was developed to identify the occurrence of soils over a complex landscape, where the basic proposition is that soil distribution can be most efficiently identified by the separation of pedogeomorphological units where similar hydrological, geomorphological, and pedological processes occur.

TL;DR: In this paper, a comprehensive data set containing detailed measurements of 63 German soil horizons, to which none of the models had been previously calibrated, were used for the evaluation of pedo-transfer functions.

TL;DR: In this paper, the dynamics of different physically separated SOM pools at different depths in a cerrado oxisol (Typic Haplustox), under natural conditions and after 23 years of cultivated pasture (Brachiaria spp.), were studied.

TL;DR: In this paper, the surface fractal dimension of the pore-solid interface was measured by fitting two straight lines to the log-log plot and finding a crossover point at a scale of about 14 μm, forming the border between textural and structural fractality.

TL;DR: In this article, a non-parametric approach for assessing the probability that heavy metal concentrations in soil exceed a location-specific environmental threshold is presented, illustrated for an airborne Cd-contaminated area in Belgium.

TL;DR: Since the 1960s, soil microbiologists underwent major changes in methods and approaches and this review focuses on the developments in some selected aspects of soil microbiology.

TL;DR: In this paper, the authors evaluated the DOC sorption of soils using differently pretreated soil samples (field-fresh (two sampling dates), air-dried, stored at 3°C and −18°C).

TL;DR: In this paper, the authors studied the soil characteristics and plant zonation in a semiarid Mediterranean salt marsh in SE Spain, where two transects were established from the border of La Mata lagoon to the upland vegetation limit and soils were described and analyzed.

TL;DR: In this paper, the Modified Hedley sequential fractionation of soil phosphorus provides a measure of plant available and recalcitrant forms of mineral and organically bound phosphorus in the soil.

TL;DR: The structure of the forest humus microbial community was shown to be strongly influenced by the indigenous fertility of the coniferous forest site type, which was in turn related to humus nutritional status, pH, moisture, tree species and ground vegetation.

TL;DR: Examples from the Murray-Darling basin in Australia are used to illustrate different methods of disaggregation of reconnaissance-scale maps, and a two-level decision tree example is presented.

TL;DR: In this article, the structural stability of these soils by testing aggregate breakdown under fastwetting, slow-wetting and mechanical breakdown was investigated, which revealed the great stability of aggregates from soils with a cyanobacterial cover (MWD 1.82 to 3.10 mm).

TL;DR: In this article, the effect of termite activity on infiltration in natural conditions was quantified and an analysis of the various processes involved was provided. But, it was not shown that the influence of the large macropores made by termites is better described as a runoff interception process than by ponded infiltration.

TL;DR: In this paper, a field experiment in which soil blocks from the forest were implanted in the pasture, and soil blocks of the pasture were implanted into the forest was conducted to verify the formation of the compact crust at the soil surface in pasture environment, and evaluate the time necessary for the formation and the destruction of this crust, and to find out if the crust formation was a reversible process.

TL;DR: In the last decade, noticeable changes are evident in methods and research priorities in the discipline of soil science as discussed by the authors, which has resulted in new areas of soil sub-disciplines such as land and soil quality, land degradation and desertification, cycling of bio-geochemicals, soil pollution assessment and monitoring.