A Rapid Method for the Assessment of Air-Filled Porosity and Its Relationship With Other Methods

Waller, Philip; Harrison, A.M.

doi:10.17660/actahortic.1986.178.13

Cited by 4 publications

(4 citation statements)

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“…The simulated soil profile consists of five soil layers, which are implemented with decreasing numerical resolution with depth (Table 1). We derived the saturated water content Θ s (cm 3 cm −3 , Table 1) from onsite measurements (Supplemental Table S1) following Waller and Harrison (1986) and Rühlmann, Körschens, and Graefe (2005). Recorded grain size distribution, organic C content, and bulk density (Supplemental Table S1) were used to estimate the other Mualem–van Genuchten parameters λ (–), α (cm −1 ), n (–), and residual water content Θ r (cm 3 cm −3 ) with PTFs.…”

Section: Methodsmentioning

confidence: 99%

“…Residual water content (Θ r ) was set to 0.1% (v/v), which was the minimum observed soil moisture content in the area. Saturated water content (Θ s ) was based on onsite measurements (Supplemental Table S1) following Waller & Harrison (1986) and Rühlmann et al (2005). Finally, Mualem-van Genuchten parameters α, λ, and n were derived from onsite measurements using pedotransfer functions after Wösten et al (1999 manual; Kroes, van Dam, Groenendijk, Hendriks, & Jacobs, 2008), modeled by pedotransfer functions (PTFs), or directly or indirectly measured.…”

Section: Input Data and Model Parametersmentioning

confidence: 99%

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Simulating future salinity dynamics in a coastal marshland under different climate scenarios

Eberhard

Schaik

Schibalski

et al. 2020

Vadose Zone Journal

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Salinization is a well-known problem in agricultural areas worldwide. In the last 20-30 yr, rising salinity in the upper, unconfined aquifer has been observed in the Freepsumer Meer, a grassland near the German North Sea coast. For investigating long-term development of salinity and water balance during 1961-2099, the one-dimensional Soil-Water-Atmosphere-Plant (SWAP) model was set up and calibrated for a soil column in the area. The model setup involves a deep aquifer as the source of salt through upward seepage. In the vertical salt transport equation, dispersion and advection are included. Six different regional outputs of statistical downscaling methods were used as climate scenarios. These comprise different rates of increasing surface temperature and different trends in seasonal rainfall. The simulation results exhibit opposing salinity trends for topsoil and deeper layers. Although projections of some scenarios entail decreasing salinities near the surface, most of them project a rise in subsoil salinity, with the strongest trends of up to +0.9 mg cm −3 100 yr −1 at −65 cm. The results suggest that topsoil salinity trends in the study area are affected by the magnitude of winter rainfall trends, whereas high subsoil salinities correspond to low winter rainfall and high summer temperature. How these projected trends affect the vegetation and thereby future land use will depend on the future management of groundwater levels in the area.

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Section: Methodsmentioning

confidence: 99%

Section: Input Data and Model Parametersmentioning

confidence: 99%

Simulating future salinity dynamics in a coastal marshland under different climate scenarios

Eberhard

Schaik

Schibalski

et al. 2020

Vadose Zone Journal

View full text Add to dashboard Cite

show abstract

“…We derived the saturated water content Θ s (cm 3 cm −3 , Table 1) from on-site measurements (Table A2) following Waller and Harrison (1986) and Rühlmann et al (2005). Recorded grain size distribution, organic carbon content, and bulk density (Table A2) water content Θ r (cm 3 cm −3 ) with three PTFs.…”

Section: Input Data and Model Parametersmentioning

confidence: 99%

Simulating future salinity dynamics in a coastal marshland under different climate scenarios

Eberhard

Schaik

Schibalski

et al. 2019

Preprint

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Abstract. Salinization is a well-known problem in agricultural areas worldwide. For the last 20–30 years, rising salinity in the upper, unconfined aquifer has been observed in the Freepsumer Meer, a deep grassland area near the German North Sea coast. In order to investigate long-term development of soil salinity and water balance, the one-dimensional SWAP model was set up and calibrated for a soil column in the area, simulating water and salt balance at discrete depths for 1961–2099. The model setup involved a deep aquifer as the only source of salt through upward seepage since other sources were negligible. In the vertical salt transport equation, only dispersion and advection were included. Six different regional outputs of statistical downscaling methods (WETTREG, XDS), based on simulations of different GCMs (ECHAM5, ECHAM6, IPSL-CM5) driven by greenhouse gas emission scenarios (SRES-A2, SRES-B1) and concentration pathways (RCP45, RCP85), were used as scenarios. These comprised different rates of increasing surface temperature and essentially different trends in seasonal rainfall. The results of the model runs exhibit opposing salinity trends for topsoil and deeper layers: While the projections of some scenarios entail decreasing salinities near the soil surface, most of them project a rise in subsoil salinity with strongest trends of up to +0.9 mg cm−3 (100 a)−1 at −65 cm. The results suggest that topsoil salinity trends are affected by the magnitude of winter rainfall trends while high subsoil salinity trends correspond to low winter rainfall and high summer temperature. Absolute salinity is high in scenarios of high-temperature and low-rainfall summers. How these projected trends affect the vegetation and thereby future land use will depend on the future management of groundwater levels in the area.

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“…Procedures for the rapid determination of the physical properties of substrates often use specialized, mostly cylindrical containers, such as cans (Bunt, 1983;White and Mastalerz, 1966), polypropylene beakers (Waller and Harrison, 1986), and glass cylinders (Chen et al, 1988;D'Angelo and Titone, 1988). These methods did not duplicate the proportional changes in volume from top to bottom present in conventional pots.…”

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confidence: 99%

A Rapid Method for Determining Physical Properties of Undisturbed Substrate

Niedziela¹,

Nelson²

1992

HortSci

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A new tube method for determining physical properties in container substrates was compared to an existing system. While both offer the advantages of undisturbed substrate and measurement of properties without altering the geometry of the substrate in the container, the tube method is easier to conduct. Both methods proved equally effective for determining air-tilled porosity, container capacity, total porosity, bulk density, and particle density.

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A Rapid Method for the Assessment of Air-Filled Porosity and Its Relationship With Other Methods

Cited by 4 publications

References 0 publications

Simulating future salinity dynamics in a coastal marshland under different climate scenarios

Simulating future salinity dynamics in a coastal marshland under different climate scenarios

Simulating future salinity dynamics in a coastal marshland under different climate scenarios

A Rapid Method for Determining Physical Properties of Undisturbed Substrate

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