Estimation of water-retention characteristics from the bulk density and particle-size distribution of Swedish soils

K. Rajkai, Sender Kabos, M. Th Van Genuchten, Per Erik Jansson

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

A Swedish soils database containing soil-water retention data, particle-size fractions, dry bulk density, and organic matter content, was analyzed in order to find a relatively simple predictor of the soil-water retention curve (SWRC). As a SWRC model we chose a three-parameter function selected from nine van Genuchten-type retention models that were fitted to the measured retention data by nonlinear parameter optimization. Cumulative particle-size (CP) data were described by a logistic distribution model. Additionally, the mean and standard deviation of the CP distribution were estimated directly from the measured particle-size data. Regression equations were subsequently used to estimate the parameters in the selected SWRC model from available soil properties, particle-size data, and CP distribution parameters. Four alternative pedotransfer models were formulated to estimate the SWRC curve from the basic soil properties. These models predicted the SWRC curves from either the original soil data or from the CP distribution parameters. A mean estimation error of less than 2.5% was used to indicate a good estimation. The highest ratio (67%) of good estimations and the lowest ratio (12%) of poor estimations were obtained when both the original soil properties and the CP model parameters were used. Our study shows that the resulting simple SWRC model gives a good description and a usable prediction of the retention properties of Swedish soils for a wide range of soil textures.

Original languageEnglish
Pages (from-to)832-845
Number of pages14
JournalSoil Science
Volume161
Issue number12
Publication statusPublished - 1996

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particle size distribution
water retention
soil water characteristic
bulk density
particle size
soil water
soil
water
soil properties
soil property
soil water retention
dry density
soil texture
parameter
logistics
soil organic matter
organic matter
prediction

ASJC Scopus subject areas

  • Soil Science
  • Earth-Surface Processes

Cite this

Estimation of water-retention characteristics from the bulk density and particle-size distribution of Swedish soils. / Rajkai, K.; Kabos, Sender; Van Genuchten, M. Th; Jansson, Per Erik.

In: Soil Science, Vol. 161, No. 12, 1996, p. 832-845.

Research output: Contribution to journalArticle

Rajkai, K. ; Kabos, Sender ; Van Genuchten, M. Th ; Jansson, Per Erik. / Estimation of water-retention characteristics from the bulk density and particle-size distribution of Swedish soils. In: Soil Science. 1996 ; Vol. 161, No. 12. pp. 832-845.
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