Calibration of time domain reflectometry for forest soil humus layers

Jukka Pumpanen, Hannu Ilvesniemi

    Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review


    Time domain reflectometry (TDR) has become a widely used method for determining the volumetric water content of soils. However, due to the differences in bulk density and surface area, the relationship between the dielectric constant and water content in organic soils is very different from that in mineral soil. It is therefore impossible to have a universal calibration suitable for all soil types. In this article we describe the relationship between the apparent dielectric constant (K-a) and volumetric water content (theta(v)) for homogenized and undisturbed humus layers (Of + Oh) from forested soil using three empirical models. There was a clear relationship between the K-a and theta(v) and this relationship was best described (R-2 = 0.968) with a logarithmic equation of the form theta(v) = aln(K-a) - b. Accurate determination of sample volume was the main source of variation in the calibration, having a greater effect on the calibration results than differences in bulk density.
    TidskriftBoreal Environment Research
    Sidor (från-till)589-595
    Antal sidor7
    StatusPublicerad - 2005
    MoE-publikationstypA1 Tidskriftsartikel-refererad


    • 411 Jordbruks- och skogsvetenskaper
    • metsämaa
    • humus

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