Impact of air-borne or canopy-derived dissolved organic carbon (DOC) on forest soil solution DOC in Flanders, Belgium

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    Abstract

    Dissolved organic carbon (DOC) in the soil solution of forests originates from a number of biologically and/or biochemically mediated processes, including litter decomposition and leaching, soil organic matter mineralization, root exudation, mucilage and microbial activity. A variable amount of DOC reaches the forest floor through deposition, but limited information is available about its impact on soil solution DOC. In this study, trends and patterns of soil solution DOC were evaluated in relation to deposition of DOC over an 11-year period (2002e2012) at five ICP Forests intensive monitoring plots in Flanders, northern Belgium. Trend analysis over this period showed an increase of soil solution DOC concentrations
    for all observed depth intervals. Fluxes of DOC increased in the organic layer, but were nearly stable in the mineral soil. Annual leaching losses of DOC were higher in coniferous (55e61 kg C ha1) compared to deciduous plots (19e30 kg C ha1) but embody less than 0.05% of total 1-m soil organic C stocks.
    Temporal deposition patterns could not explain the increasing trends of soil solution DOC concentrations.
    Deposition fluxes of DOC were strongly correlated with soil solution fluxes of DOC, but their seasonal peaks were not simultaneous, which confirmed that air-borne or canopy-derived DOC has a limited impact on soil solution DOC.
    Original languageEnglish
    JournalAtmospheric Environment
    Volume83
    Pages (from-to)155-165
    Number of pages11
    ISSN1352-2310
    DOIs
    Publication statusPublished - 2014

    Thematic list

    • Climate
    • Acidification

    EWI Biomedical sciences

    • B003-ecology
    • deposition
    • soil solution

    Policy

    • woodland protection
    • soil protection
    • air pollution emission policy

    Geographic list

    • Flanders

    Technological

    • modelling

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