X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Two-Region Extended Archie's Law Model for Soil Air Permeability and Gas Diffusivity
    Wiley ; 2011
    In:  Soil Science Society of America Journal Vol. 75, No. 3 ( 2011-05), p. 795-806
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 75, No. 3 ( 2011-05), p. 795-806
    Type of Medium: Online Resource
    ISSN: 0361-5995
    URL: Article
    DOI: 10.2136/sssaj2010.0207
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2011
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 2
    Online Resource
    Online Resource
    Diffusion Aspects of Designing Porous Growth Media for Earth and Space
    Wiley ; 2012
    In:  Soil Science Society of America Journal Vol. 76, No. 5 ( 2012-09), p. 1564-1578
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 76, No. 5 ( 2012-09), p. 1564-1578
    Type of Medium: Online Resource
    ISSN: 0361-5995
    URL: Article
    DOI: 10.2136/sssaj2011.0438
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2012
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 3
    Online Resource
    Online Resource
    Generalized Density‐Corrected Model for Gas Diffusivity in Variably Saturated Soils
    Wiley ; 2011
    In:  Soil Science Society of America Journal Vol. 75, No. 4 ( 2011-07), p. 1315-1329
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 75, No. 4 ( 2011-07), p. 1315-1329
    Abstract: Accurate predictions of the soil‐gas diffusivity ( D p / D o , where D p is the soil‐gas diffusion coefficient and D o is the diffusion coefficient in free air) from easily measureable parameters like air‐filled porosity (ε) and soil total porosity (ϕ) are valuable when predicting soil aeration and the emission of greenhouse gases and gaseous‐phase contaminants from soils. Soil type (texture) and soil density (compaction) are two key factors controlling gas diffusivity in soils. We extended a recently presented density‐corrected D p (ε)/ D o model by letting both model parameters (α and β) be interdependent and also functions of ϕ. The extension was based on literature measurements on Dutch and Danish soils ranging from sand to peat. The parameter α showed a promising linear relation to total porosity, while β also varied with α following a weak linear relation. The thus generalized density‐corrected (GDC) model gave improved predictions of diffusivity across a wide range of soil types and density levels when tested against two independent data sets (total of 280 undisturbed soils or soil layers) representing Danish soil profile data (0–8 m below the ground surface) and performed better than existing models. The GDC model was further extended to describe two‐region (bimodal) soils and could describe and predict D p / D o well for both different soil aggregate size fractions and variably compacted volcanic ash soils. A possible use of the new GDC model is engineering applications such as the design of highly compacted landfill site caps.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2010.0405
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2011
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 4
    Online Resource
    Online Resource
    Water Retention, Gas Transport, and Pore Network Complexity during Short-Term Regeneration of Soil Structure
    Wiley ; 2013
    In:  Soil Science Society of America Journal Vol. 77, No. 6 ( 2013-11), p. 1965-1976
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 77, No. 6 ( 2013-11), p. 1965-1976
    Type of Medium: Online Resource
    ISSN: 0361-5995
    URL: Article
    DOI: 10.2136/sssaj2013.07.0270
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2013
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 5
    Online Resource
    Online Resource
    Linking Particle and Pore Size Distribution Parameters to Soil Gas Transport Properties
    Wiley ; 2012
    In:  Soil Science Society of America Journal Vol. 76, No. 1 ( 2012-01), p. 18-27
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 76, No. 1 ( 2012-01), p. 18-27
    Abstract: Accurate estimation of soil gas diffusivity ( D p / D o , the ratio of gas diffusion coefficients in soil and free air) and air permeability ( k a ) from basic texture and pore characteristics will be highly valuable for modeling soil gas transport and emission and their field‐scale variations. From the topsoil of two Danish arable fields representing two natural clay gradients, D p / D o and k a were measured at soil water matric potentials between −1 and −100 kPa on undisturbed soil cores. The Rosin–Rammler particle size distribution parameters α and β (characteristic particle size and degree of sorting, respectively) and the Campbell water retention parameter b were used to characterize particle and pore size distributions, respectively. Campbell b yielded a wide interval (4.6–26.2) and was highly correlated with α, β, and volumetric clay content. Both D p / D o and k a followed simple power‐law functions (PLFs) of air‐filled porosity (ε a ). The PLF tortuosity–connectivity factors ( X *) for D p / D o and k a were both highly correlated with all basic soil characteristics, in the order of volumetric clay content = Campbell b 〉 gravimetric clay content 〉 α 〉 β. The PLF water blockage factors ( H ) for D p / D o and k a were also well (but relatively more weakly) correlated with the basic soil characteristics, again with the best correlations to volumetric clay content and b . As a first attempt at developing a simple D p / D o model useful at the field scale, we extended the classical Buckingham D p / D o model (ε a 2 ) by a scaling factor based on volumetric clay content. The scaled Buckingham model provided accurate predictions of D p (ε a )/ D o across both natural clay gradients.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2011.0125
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2012
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 6
    Online Resource
    Online Resource
    Linking Soil Microbial Activity to Water‐ and Air‐Phase Contents and Diffusivities
    Wiley ; 2003
    In:  Soil Science Society of America Journal Vol. 67, No. 1 ( 2003-01), p. 156-165
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 67, No. 1 ( 2003-01), p. 156-165
    Abstract: Quantification of in situ soil microbial activity is indispensable to improve manipulation of nutrient turnover in soil and optimize crop nutrient supply. We sampled 100‐cm 3 cores of undisturbed arable soil at three locations along a naturally occurring clay gradient (L1: 11% clay; L3: 22% clay; L5: 34% clay). The cores were drained to seven different matric potentials in the range −15 to −1500 hPa and gas diffusion determined prior to a 4‐wk incubation at 20°C in the dark. For all soils the net nitrification increased with water content to a maximum (L1, 12.1 μg NO 3 –N g −1 soil; L3, 10.3 μg NO 3 –N g −1 soil; and L5, 8.2 μg NO 3 –N g −1 soil) and then decreased with further increase in water content. The water content at maximum nitrification was 0.26, 0.37, and 0.42 m 3 m −3 , respectively. Calculations of water‐filled pore space (WFPS) did not normalize soil type differences in optima for microbial activity. The matric potential at peak net nitrification was −140, −170, and −430 hPa, respectively. No single correlation between CO 2 evolution and soil water content existed across soil types. The relative solute diffusivity estimated by recently developed models offered a better description of CO 2 evolution. The relative gas diffusivity was a better predictor of the increase in net nitrification than was the soil air content. A conceptual model balancing the effects of solute and gas diffusivity indicated that the relative trend in the observed optima of water contents across soil types was as expected. We advocate the use of the conceptual model including soil type dependent expressions for solute and gas diffusivity in future studies of aerobic microbial activity.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2003.1560
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2003
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 7
    Online Resource
    Online Resource
    Multitracer and Filter‐Separated Half‐Cell Method for Measuring Solute Diffusion in Undisturbed Soil
    Wiley ; 2010
    In:  Soil Science Society of America Journal Vol. 74, No. 4 ( 2010-07), p. 1084-1091
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 74, No. 4 ( 2010-07), p. 1084-1091
    Abstract: Solute diffusion controls important processes in soils: plant uptake of nutrients, sorption–desorption processes, degradation of organic matter, and leaching of radionuclides through clay barriers. We developed a new method for measuring the solute diffusivity (solute diffusion coefficient in the soil relative to water) in intact soil samples (the Multiple Tracer, Filter Separated half‐cell method using a Dynamic Model for parameter estimation [MT‐FS‐DM]). The MT‐FS‐DM method consists of half‐cell diffusion of two pairs of counterdiffusing anionic tracers and a parameter estimation scheme that allows diffusion coefficients for tracers in the two half‐cells to be estimated on the basis of two concentration profiles in each sample. The parameter estimation scheme uses a fully dynamic (time‐resolved) simulation model. From sensitivity and uncertainty analyses of the dynamic model, we found that the MT‐FS‐DM method provided reliable results. We compared diffusivities measured on a sandy loam soil using the MT‐FS‐DM method with diffusivities from six sandy loam test soils from the literature. The new method can be used to estimate solute diffusivity in intact structured soil and provides a more confident estimate for solute diffusion due to the use of two tracer profiles in the same soil sample. Especially when we are interested in determining the diffusivity of a single intact soil sample, such as when relating solute diffusivity to other proper ties of the soil (e.g., microbial activity), this method will be an improvement over existing methods.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2009.0285
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2010
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 8
    Online Resource
    Online Resource
    Solute Diffusivity in Undisturbed Soil: Effects of Soil Water Content and Matric Potential
    Wiley ; 2012
    In:  Soil Science Society of America Journal Vol. 76, No. 1 ( 2012-01), p. 51-60
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 76, No. 1 ( 2012-01), p. 51-60
    Abstract: Solute diffusivity in soil plays a major role in many important processes with relation to plant growth and environmental issues. Soil solute diffusivity is affected by the volumetric water content as well as the morphological characteristics of water‐filled pores. The solute diffusivity in intact soil samples from two different tillage treatments (soil from below the depth of a harrow treatment and soil from within a moldboard plowed plow layer) was estimated based on concentration profiles using a newly developed method. The method makes use of multiple tracers (two sets of counterdiffusing tracers) for a better determination of the diffusivity. The diffusivity was higher in the below‐till soil than the plowed soil at the same soil water matric potential due to higher water content but also due to higher continuity and lower tortuosity of the soil pores. We measured identical solute diffusivities independent of the tracer set used. We analyzed the whole data set using Archie's law and found a linear relation between Archie's exponent and the logarithm of the soil water matric suction in centimeters of water (pF). An analysis of seven data sets from the literature showed that this was a general trend for soils with moderate to low clay contents.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2011.0043
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2012
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 9
    Online Resource
    Online Resource
    Comparison of Air and Water Permeability between Disturbed and Undisturbed Soils
    Wiley ; 2005
    In:  Soil Science Society of America Journal Vol. 69, No. 5 ( 2005-09), p. 1361-1371
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 69, No. 5 ( 2005-09), p. 1361-1371
    Abstract: Although soil structure and pore geometry characteristics largely control flow and transport processes in soils, there is a general lack of experiments that study the effects of soil structure and pore‐space characteristics on air and water permeability. Our objective was to determine the dependency of soil permeability on fluid content for both water and air, and compare results for both disturbed (D) and undisturbed (UD) soils. For that purpose, we first measured the water permeability ( k w ) and air permeability ( k a ) for several intact UD soil samples. Subsequently, the same samples were crushed and repacked into the same soil cores to create the D equivalent for the same soil material. Measurements showed large differences between D and UD samples, confirming the enormous impact of soil structure and pore‐space characteristics on flow. The permeability of both fluid phases (air and water) was greatly reduced for the D samples, especially for soil air permeability due to its greater dependency on soil aggregation and structure. Soil water retention and permeability data were fitted to Campbell's and Mualem's pore‐size distribution model, respectively. Regardless of soil disturbance, we showed that the tortuosity–connectivity parameter, l , for the water permeability ( l 1 ) and air permeability ( l 2 ) were different. This is in contrast to the general practice of using the same parameter value for both functions. The relation between l 1 and l 2 was largely controlled by soil structure and associated macroporosity properties.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2004.0332
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2005
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 10
    Online Resource
    Online Resource
    Unified Measurement System for the Gas Dispersion Coefficient, Air Permeability, and Gas Diffusion Coefficient in Variably Saturated Soil
    Wiley ; 2009
    In:  Soil Science Society of America Journal Vol. 73, No. 6 ( 2009-11), p. 1921-1930
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 73, No. 6 ( 2009-11), p. 1921-1930
    Abstract: The transport of gaseous compounds in soil takes place by gas diffusion, advection, and dispersion. Gas transport processes are influenced by the soil‐gas diffusion coefficient ( D p ), air permeability ( k a ) and soil‐gas dispersion coefficient ( D H ), respectively. Of three gas transport parameters, D H is the least understood, especially how it is correlated to soil type, moisture conditions, and other transport parameters (i.e., D p and k a ). In this study, a unified measurement system (UMS) that enables sequential measurement of D p , k a , and D H on the same soil core was developed. The experimental sequence is based on a two‐chamber measurement of D H and k a , followed by a one‐chamber measurement of D p Gaseous oxygen concentration and air pressure sensors are located in inlet and outlet chambers as well as at multiple points along the soil column. Using different particle‐size fractions of non‐aggregated (Toyoura sand) and aggregated (Nishi‐Tokyo loam) soils, the effects of soil structure, particle (aggregate) size, and column scale (5‐cm i.d. and 30‐cm or 60‐cm length) on the three gas transport parameters were investigated. For both soils, D H linearly increased with increasing pore‐air velocity. For Toyoura sand, gas dispersivity (λ = D H / u 0 ) decreased with increasing soil‐air content, while for Nishi‐Tokyo loam, gas dispersivity decreased with increasing soil‐air content to a minimum value when inter‐aggregate pores were drained and increased again when the pores inside the soil aggregates started to act as tortuous air‐filled pathways. In the arterial pore region (corresponding to the total pore volume for Narita sand and the inter‐aggregate pore volume for Nishi‐Tokyo loam), a linear relation between tortuosity of the air‐filled pore network ( T , calculated from D p ) and the gas dispersivity (λ) was observed.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2009.0012
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2009
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
Nothing or not found what you are looking for? Please check your search query or use the Interlibrary Loan Search.
Close ⊗
This website uses cookies and the analysis tool Matomo. Further information can be found on the KOBV privacy pages