A binary mixing model for characterizing stony-soil water retention

Kshitij Parajuli, Morteza Sadeghi, Scott B. Jones

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

A century of research focused primarily on agricultural soils has largely ignored stony soils, which dominate some forests and are poorly understood in terms of the stone influence on soil hydraulic properties. Motivated by this knowledge gap, we quantified the influence of soil-containing stone fragments on bulk soil hydraulic properties by determining the water retention curve (WRC) of soil, stone and stone-soil mixtures with varied volumetric stone content. The measured WRC for seven different stone types based on their composition showed maximum and minimum saturated water contents of 0.55 m3 m−3 in pumice and 0.025 m3 m−3 in fine sandstone, respectively. The stony soil water retention function was measured using the simplified evaporation method. Contrasting scenarios were studied considering a broad range of stone inclusions; (i) negligibly porous, (ii) significantly porous but less porous than the background soil, (iii) more porous than the background soil. An averaging scheme to describe the WRC of stony soil was proposed based on the individual WRC of the background and stone inclusion which was in good agreement with the experimental data. The HYDRUS-3D model was also employed to simulate the evaporation experiment used for the WRC measurements. The model simulations supported the basic assumptions of the proposed averaging scheme.

Original languageEnglish (US)
Pages (from-to)1-8
Number of pages8
JournalAgricultural and Forest Meteorology
Volume244-245
DOIs
StatePublished - Oct 15 2017
Externally publishedYes

Keywords

  • Binary mixture
  • HYDRUS-3D
  • Simplified evaporation method
  • Stony soil
  • Water retention

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