Methane production and carbon mineralisation of size and density fractions of peat soils

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    Abstract

    For the purpose of characterisation of soil organic matter breakdown, soil organic matter is often divided into different fractions, each with its own decomposition rate. Thus far, no attempts had been made to quantify the methane production capacity of individual soil fractions. We aimed to improve our understanding of CH4 emissions from peat soils by studying the CH4 production capacity of individual soil fractions in parallel with their carbon mineralisation capacity. Samples from two wet grasslands on peat soil (0-60 cm) were fractionated into different size and density fractions (> 2.0 mm; 0.25-2.0 mm, light; 0.25-2.0 mm, heavy; 150-250 μm, light; 150-250 μm, heavy; < 150 μm) using sieves and Ludox, an aqueous colloidal dispersion of silica particles. The individual fractions were rather similar with respect to C mineralisation capacity and C-to-N ratio, but not with respect to CH4 production capacity. C mineralisation capacity ranged from 10 to 100 μmol CO2-C g-1 C d-1 and decreased with depth. CH4 production capacity ranged from 0 to 150 nmol CH4-C g-1 C d-1. We found that significant CH4 production only occurred for fractions with a large particle size; the fraction >2.0 mm contributed 90␝o total CH4 production capacity. Furthermore, CH4 production capacity strongly decreased with depth; the layer 0-5 cm contributed 70␝o total CH4 production capacity. This indicates that in the wet peat soils recent plant residues are a major substrate for methanogens.
    Original languageEnglish
    Pages (from-to)877-886
    JournalSoil Biology and Biochemistry
    Volume31
    Issue number6
    DOIs
    Publication statusPublished - 1999

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    peat soils
    peat soil
    Methane
    methane production
    mineralization
    Soil
    Carbon
    methane
    soil separates
    soil organic matter
    carbon
    plant residue
    soil
    grassland
    methanogens
    decomposition
    plant residues
    substrate
    grasslands
    Light

    Cite this

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    title = "Methane production and carbon mineralisation of size and density fractions of peat soils",
    abstract = "For the purpose of characterisation of soil organic matter breakdown, soil organic matter is often divided into different fractions, each with its own decomposition rate. Thus far, no attempts had been made to quantify the methane production capacity of individual soil fractions. We aimed to improve our understanding of CH4 emissions from peat soils by studying the CH4 production capacity of individual soil fractions in parallel with their carbon mineralisation capacity. Samples from two wet grasslands on peat soil (0-60 cm) were fractionated into different size and density fractions (> 2.0 mm; 0.25-2.0 mm, light; 0.25-2.0 mm, heavy; 150-250 μm, light; 150-250 μm, heavy; < 150 μm) using sieves and Ludox, an aqueous colloidal dispersion of silica particles. The individual fractions were rather similar with respect to C mineralisation capacity and C-to-N ratio, but not with respect to CH4 production capacity. C mineralisation capacity ranged from 10 to 100 μmol CO2-C g-1 C d-1 and decreased with depth. CH4 production capacity ranged from 0 to 150 nmol CH4-C g-1 C d-1. We found that significant CH4 production only occurred for fractions with a large particle size; the fraction >2.0 mm contributed 90␝o total CH4 production capacity. Furthermore, CH4 production capacity strongly decreased with depth; the layer 0-5 cm contributed 70␝o total CH4 production capacity. This indicates that in the wet peat soils recent plant residues are a major substrate for methanogens.",
    author = "{van den Pol-van Dasselaar}, A. and O. Oenema",
    year = "1999",
    doi = "10.1016/S0038-0717(98)00188-6",
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    Methane production and carbon mineralisation of size and density fractions of peat soils. / van den Pol-van Dasselaar, A.; Oenema, O.

    In: Soil Biology and Biochemistry, Vol. 31, No. 6, 1999, p. 877-886.

    Research output: Contribution to journalArticleAcademicpeer-review

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    T1 - Methane production and carbon mineralisation of size and density fractions of peat soils

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    AU - Oenema, O.

    PY - 1999

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    N2 - For the purpose of characterisation of soil organic matter breakdown, soil organic matter is often divided into different fractions, each with its own decomposition rate. Thus far, no attempts had been made to quantify the methane production capacity of individual soil fractions. We aimed to improve our understanding of CH4 emissions from peat soils by studying the CH4 production capacity of individual soil fractions in parallel with their carbon mineralisation capacity. Samples from two wet grasslands on peat soil (0-60 cm) were fractionated into different size and density fractions (> 2.0 mm; 0.25-2.0 mm, light; 0.25-2.0 mm, heavy; 150-250 μm, light; 150-250 μm, heavy; < 150 μm) using sieves and Ludox, an aqueous colloidal dispersion of silica particles. The individual fractions were rather similar with respect to C mineralisation capacity and C-to-N ratio, but not with respect to CH4 production capacity. C mineralisation capacity ranged from 10 to 100 μmol CO2-C g-1 C d-1 and decreased with depth. CH4 production capacity ranged from 0 to 150 nmol CH4-C g-1 C d-1. We found that significant CH4 production only occurred for fractions with a large particle size; the fraction >2.0 mm contributed 90␝o total CH4 production capacity. Furthermore, CH4 production capacity strongly decreased with depth; the layer 0-5 cm contributed 70␝o total CH4 production capacity. This indicates that in the wet peat soils recent plant residues are a major substrate for methanogens.

    AB - For the purpose of characterisation of soil organic matter breakdown, soil organic matter is often divided into different fractions, each with its own decomposition rate. Thus far, no attempts had been made to quantify the methane production capacity of individual soil fractions. We aimed to improve our understanding of CH4 emissions from peat soils by studying the CH4 production capacity of individual soil fractions in parallel with their carbon mineralisation capacity. Samples from two wet grasslands on peat soil (0-60 cm) were fractionated into different size and density fractions (> 2.0 mm; 0.25-2.0 mm, light; 0.25-2.0 mm, heavy; 150-250 μm, light; 150-250 μm, heavy; < 150 μm) using sieves and Ludox, an aqueous colloidal dispersion of silica particles. The individual fractions were rather similar with respect to C mineralisation capacity and C-to-N ratio, but not with respect to CH4 production capacity. C mineralisation capacity ranged from 10 to 100 μmol CO2-C g-1 C d-1 and decreased with depth. CH4 production capacity ranged from 0 to 150 nmol CH4-C g-1 C d-1. We found that significant CH4 production only occurred for fractions with a large particle size; the fraction >2.0 mm contributed 90␝o total CH4 production capacity. Furthermore, CH4 production capacity strongly decreased with depth; the layer 0-5 cm contributed 70␝o total CH4 production capacity. This indicates that in the wet peat soils recent plant residues are a major substrate for methanogens.

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    ER -