MartyHouleDuchesneEtAl2019

Référence

Marty, C., Houle, D., Duchesne, L., Gagnon, C. (2019) Evidence of secondary sulfate production in the mineral soil of a temperate forested catchment in southern Québec, Canada. Applied Geochemistry, 100:279-286. (Scopus )

Résumé

The analysis of sulfate stable isotope ratios (δ 18 O-SO 4 and δ 34 S-SO 4 ) in different hydrological compartments of forested catchments has revealed the major role of the humus layer in recycling atmospherically derived sulfur (S). The contribution of the mineral soil to S recycling is still uncertain and may vary among forest types. Here, seasonal variations in SO 4 concentration, δ 18 O-SO 4 and δ 34 S-SO 4 were investigated over a period of two and a half years in precipitation and at various depths in the soil solutions in a temperate forest catchment dominated by sugar maple in southern Québec, Canada. δ 18 O-SO 4 declined from precipitation (11.8‰) to the humus solution (4.8‰) and to the soil solution beneath the upper B-horizon (1.2‰). No decline was observed below the upper B-horizon. This decline from precipitation to the humus layer reflected a production of secondary sulfate through chemical oxidation of SO 2 in the canopy, while the decline in the soil resulted from microbial mineralization of organic S. In contrast with findings at other boreal and temperate forest sites, lower δ 18 O-SO 4 in the upper mineral soil than in the humus layer was indicative of microbial transformations of S not only in the humus layer but also deeper in the upper part of the mineral soil. Significant seasonal variations were found for δ 18 O-SO 4 in precipitation and in soil solutions beneath the humus and the top mineral horizon, reflecting the influence of both hydrological and microbiological factors. Higher δ 18 O-SO 4 in the soil solution in fall than in spring and summer resulted from the release of primary sulfate from snow cover in early spring, which was subsequently recycled by soil microorganisms during the growth season, resulting in a higher proportion of secondary sulfate in fall than in spring and summer. © 2018

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@ARTICLE { MartyHouleDuchesneEtAl2019,
    AUTHOR = { Marty, C. and Houle, D. and Duchesne, L. and Gagnon, C. },
    TITLE = { Evidence of secondary sulfate production in the mineral soil of a temperate forested catchment in southern Québec, Canada },
    JOURNAL = { Applied Geochemistry },
    YEAR = { 2019 },
    VOLUME = { 100 },
    PAGES = { 279-286 },
    NOTE = { cited By 0 },
    ABSTRACT = { The analysis of sulfate stable isotope ratios (δ 18 O-SO 4 and δ 34 S-SO 4 ) in different hydrological compartments of forested catchments has revealed the major role of the humus layer in recycling atmospherically derived sulfur (S). The contribution of the mineral soil to S recycling is still uncertain and may vary among forest types. Here, seasonal variations in SO 4 concentration, δ 18 O-SO 4 and δ 34 S-SO 4 were investigated over a period of two and a half years in precipitation and at various depths in the soil solutions in a temperate forest catchment dominated by sugar maple in southern Québec, Canada. δ 18 O-SO 4 declined from precipitation (11.8‰) to the humus solution (4.8‰) and to the soil solution beneath the upper B-horizon (1.2‰). No decline was observed below the upper B-horizon. This decline from precipitation to the humus layer reflected a production of secondary sulfate through chemical oxidation of SO 2 in the canopy, while the decline in the soil resulted from microbial mineralization of organic S. In contrast with findings at other boreal and temperate forest sites, lower δ 18 O-SO 4 in the upper mineral soil than in the humus layer was indicative of microbial transformations of S not only in the humus layer but also deeper in the upper part of the mineral soil. Significant seasonal variations were found for δ 18 O-SO 4 in precipitation and in soil solutions beneath the humus and the top mineral horizon, reflecting the influence of both hydrological and microbiological factors. Higher δ 18 O-SO 4 in the soil solution in fall than in spring and summer resulted from the release of primary sulfate from snow cover in early spring, which was subsequently recycled by soil microorganisms during the growth season, resulting in a higher proportion of secondary sulfate in fall than in spring and summer. © 2018 },
    AFFILIATION = { Science and Technology Branch, Environment and Climate Change Canada, 105 McGill St., Montréal, QC H2Y 2E7, Canada; Direction de la Recherche Forestière, Ministère des Forêts, de la Faune et des Parcs du Québec, 2700 EinsteinQuébec QC G1P 3W8, Canada },
    AUTHOR_KEYWORDS = { S deposition; Stable isotopes; Sulfate; Temperate forests; δ 18 O-SO 4; δ 34 S-SO 4 },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1016/j.apgeochem.2018.12.006 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85058111654&doi=10.1016%2fj.apgeochem.2018.12.006&partnerID=40&md5=3355e2e0e1875981444399e11fed8569 },
}

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