Calibration of time domain reflectometry for forest soil humus layers

Jukka Pumpanen, Hannu Ilvesniemi

    Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

    Kuvaus

    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.
    Alkuperäiskielienglanti
    LehtiBoreal Environment Research
    Vuosikerta10
    Numero6
    Sivut589-595
    Sivumäärä7
    ISSN1239-6095
    TilaJulkaistu - 2005
    OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

    Tieteenalat

    • 411 Maatalous ja metsätieteet
    • metsämaa
    • humus

    Lainaa tätä

    Pumpanen, Jukka ; Ilvesniemi, Hannu. / Calibration of time domain reflectometry for forest soil humus layers. Julkaisussa: Boreal Environment Research. 2005 ; Vuosikerta 10, Nro 6. Sivut 589-595.
    @article{1390555e5fa0469688f2a2b2cb55da43,
    title = "Calibration of time domain reflectometry for forest soil humus layers",
    abstract = "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.",
    keywords = "411 Agriculture and forestry, mets{\"a}maa, humus, mets{\"a}maa, humus, mets{\"a}maa, humus",
    author = "Jukka Pumpanen and Hannu Ilvesniemi",
    year = "2005",
    language = "English",
    volume = "10",
    pages = "589--595",
    journal = "Boreal Environment Research",
    issn = "1239-6095",
    publisher = "Finnish Environment Institute",
    number = "6",

    }

    Calibration of time domain reflectometry for forest soil humus layers. / Pumpanen, Jukka; Ilvesniemi, Hannu.

    julkaisussa: Boreal Environment Research, Vuosikerta 10, Nro 6, 2005, s. 589-595.

    Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

    TY - JOUR

    T1 - Calibration of time domain reflectometry for forest soil humus layers

    AU - Pumpanen, Jukka

    AU - Ilvesniemi, Hannu

    PY - 2005

    Y1 - 2005

    N2 - 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.

    AB - 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.

    KW - 411 Agriculture and forestry

    KW - metsämaa

    KW - humus

    KW - metsämaa

    KW - humus

    KW - metsämaa

    KW - humus

    M3 - Article

    VL - 10

    SP - 589

    EP - 595

    JO - Boreal Environment Research

    JF - Boreal Environment Research

    SN - 1239-6095

    IS - 6

    ER -