Fractal Parameters of Pore Surface Area as Influenced by Simulated Soil Degradation

Pachepsky, Y. A.; Polubesova, Tamara; Hajnos, M.; Sokołowska, Z.; Józefaciuk, Grzegorz

doi:10.2136/sssaj1995.03615995005900010010x

Cited by 84 publications

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“…As a rule, the fractal behavior of natural objects occurs in a limited range of scales, called upper and lower cutoffs [10]. A measure of the complexity of fractal structures is a fractal dimension, D, that is higher for more complex ones.…”

Section: Surface Fractal Dimensionmentioning

confidence: 99%

Determination of Energetic and Geometric Properties of Plant Roots Specific Surface from Adsorption/Desorption Ishoterm

Jozefaciuk¹,

Lukowska²,

Szerement³

2013

AJPS

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Background and Aims: Structure and composition of plant roots surfaces are extremely complicated. Water vapor adsorption/desorption isotherm is a powerful tool to characterize such surfaces. The aim of this paper is to present theoretical approach for calculating roots surface parameters as adsorption energy, distribution of surface adsorption centers, as well as roots geometric and structure parameters as surface fractal dimension, nanopore sizes and size distributions on example of experimental isotherms of roots of barley taken from the literature. This approach was up to date practically not applied to study plant roots. Methods: Simplest tools of theoretical analysis of adsorption/desorption isotherms are applied. Results: Parameters characterizing energy of water binding, surface complexity and nanopore system of the studied roots were calculated and compared to these of the soils. Some possible applications of root surface parameters to study plant-soil interactions are outlined. Conclusions: Physicochemical surface parameters may be important for characterizing root surface properties, their changes in stress conditions, as well as for study and model plant processes. Physicochemical and geometrical properties of plant roots differ from these of the soils.

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Section: Surface Fractal Dimensionmentioning

confidence: 99%

Determination of Energetic and Geometric Properties of Plant Roots Specific Surface from Adsorption/Desorption Ishoterm

Jozefaciuk¹,

Lukowska²,

Szerement³

2013

AJPS

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“…The fractal dimension of mesopore surface, D mes , was calculated from the linear parts of log-log plots of the first derivative of pore volume as a function of radius vs. radius using the following dependence (Pachepsky et al, 1995):…”

Section: Calculations Of Pore Parametersmentioning

confidence: 99%

Pore‐system characteristics of pavement seam materials of urban sites

Nehls

Józefaciuk

Sokołowska

et al. 2006

Z. Pflanzenernähr. Bodenk.

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SummaryThe original light-brown sandy seam filling of pavements in urban areas turns dark and changes its properties by the time due to various inputs of urban dust. Deposited C org inputs do mostly not have natural characteristics but are man-made, e.g., diesel dust. Thus, properties of the seam material are not predictable from experiences with forest or agricultural soils. Semiperviously sealed urban areas are sites of contaminant deposition as well as groundwater recharge. For an assessment of the resulting groundwater-contamination risk in these areas, the properties of the seam material, which influences transport processes, must be known. The aim of this study was to investigate the pore-system build-up, which includes size distribution and fractal character in the seam material of urban sites. The investigated samples were taken from pavements adjacent to roads in Berlin and Warsaw. The micropore parameters (nanometer range) were characterized using water-vapor desorption isotherms, mesopore parameters (micrometer range) were estimated from mercury-intrusion porosimetry and macropore parameters (millimeter range) from water-retention curves. Particle density, dry bulk density, and particle-size distribution were measured using standard methods. Volumes of micro-and mesopores as well as particle densities and dry bulk densities correlated with C tot contents. However, no such relation was found for macropore volumes. Compared to the original sandy seam filling, the altered seam material shows significantly higher C org contents and higher amounts of micro-and mesopores. Therefore, the available water capacity increases by 0.05-0.11 m 3 m -3 , as compared to the original sandy seam filling. Compared to natural sandy soils having similar C org contents, the seam material shows similar macropore volumes, but the volume of mesopores and micropores is a few times smaller. That is mainly because of the particulate character of the organic matter.

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“…Later these authors suggested that a fractal Brownian motion can be a model for the soil water movement (Guerrini and Swartzendruber, 1994). Pachepsky et al (1995) conjectured that the fractal structure of soil pore space might cause an anomalous diffusion in soils.…”

Section: Introductionmentioning

confidence: 99%

Water transport in soils as in fractal media

Pachepsky

Timlin²

1998

Journal of Hydrology

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Fractal scaling laws of water transport were found for soils. A water transport model is needed to describe this type of transport in soils. We have developed a water transport equation using the physical model of percolation clusters, employing the mass conservation law, and assuming that hydraulic conductivity is a product of a local component dependent on water content and a scaling component depending on the distance traveled. The model predicts scaling of water contents with a variable x/t v(2dJ) wherefl deviates from the zero value characteristic for the Richards equation. A change in the apparent water diffusivity with the distance is predicted if the apparent diffusivity is calculated using the Richards equation. An equation for the time and space invariant soil water diffusivity is obtained. Published data sets of five authors were used to test the scaling properties predicted by the model. The value offl was significantly greater than zero in almost all data sets and typically was in the range from 0.05 to 0.5. This exponent was found from regression equations that had correlation coefficients from 0.97 to 0.995. In some cases a dependence offl on water content was found indicating changes in scaling as the water transport progressed.

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Fractal Parameters of Pore Surface Area as Influenced by Simulated Soil Degradation

Cited by 84 publications

References 0 publications

Determination of Energetic and Geometric Properties of Plant Roots Specific Surface from Adsorption/Desorption Ishoterm

Determination of Energetic and Geometric Properties of Plant Roots Specific Surface from Adsorption/Desorption Ishoterm

Pore‐system characteristics of pavement seam materials of urban sites

Water transport in soils as in fractal media

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