AugustinHouleGagnonEtAl2015a

Référence

Augustin, F., Houle, D., Gagnon, C., Couture, S. and Courchesne, F. (2015) Partitioning the impact of environmental factors on lake concentrations and catchment budgets for base cations in forested ecosystems. Applied Geochemistry, 53:1-12. (Scopus )

Résumé

Seventy-two forested lake catchments were studied in Quebec (Canada) to examine the influence of climate, atmospheric deposition and catchment characteristics on base cation (BC) concentrations in lake waters (BCC) and base cation budgets at the catchment scale (BCQ). The catchments are located along a bioclimatic gradient in a vast (180000km2) study area underlained by the Canadian Shield. Multivariate statistical approaches are used to simultaneously assess the effects of multiple environmental factors on cation fluxes. Mean annual BCC were 132, 40, 24 and 7μmolcl-1 for Ca, Mg, Na and K, respectively. Mean annual BCQ estimates showed exports of 0.826, 0.251, 0.135 and 0.043kmolcha-1an-1 for Ca, Mg, Na and K, respectively. There were strong similarities in the spatial variation of BCC and BCQ, and also in their links with environmental factors. We hypothesized that the spatial variability of both, BCC and BCQ, were strongly influenced by the spatial variability in the rates of mineral weathering reactions. Variance partitioning indicated that climate-related effects accounted for 51.6% and 52.7% of the variation in BCQ and BCC, respectively. Nonetheless, lake/catchment morphometry and variables linked to solutes sources (lithology, atmospheric deposition and soil properties) were also included in some models. Overall, BCC and BCQ were positively affected by temperature, precipitation as rain and sulphate depositions, and negatively influenced by precipitation as snow and the number of frost days. Multivariate models explaining up to 69% of variation in BCC and BCQ were developed. This study shows the strong impact of climatic drivers on base cation budgets and, thus, on mineral weathering at the regional scale on the Canadian Shield. © 2014 Elsevier Ltd.

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@ARTICLE { AugustinHouleGagnonEtAl2015a,
    AUTHOR = { Augustin, F. and Houle, D. and Gagnon, C. and Couture, S. and Courchesne, F. },
    TITLE = { Partitioning the impact of environmental factors on lake concentrations and catchment budgets for base cations in forested ecosystems },
    JOURNAL = { Applied Geochemistry },
    YEAR = { 2015 },
    VOLUME = { 53 },
    PAGES = { 1-12 },
    NOTE = { cited By 3 },
    ABSTRACT = { Seventy-two forested lake catchments were studied in Quebec (Canada) to examine the influence of climate, atmospheric deposition and catchment characteristics on base cation (BC) concentrations in lake waters (BCC) and base cation budgets at the catchment scale (BCQ). The catchments are located along a bioclimatic gradient in a vast (180000km2) study area underlained by the Canadian Shield. Multivariate statistical approaches are used to simultaneously assess the effects of multiple environmental factors on cation fluxes. Mean annual BCC were 132, 40, 24 and 7μmolcl-1 for Ca, Mg, Na and K, respectively. Mean annual BCQ estimates showed exports of 0.826, 0.251, 0.135 and 0.043kmolcha-1an-1 for Ca, Mg, Na and K, respectively. There were strong similarities in the spatial variation of BCC and BCQ, and also in their links with environmental factors. We hypothesized that the spatial variability of both, BCC and BCQ, were strongly influenced by the spatial variability in the rates of mineral weathering reactions. Variance partitioning indicated that climate-related effects accounted for 51.6% and 52.7% of the variation in BCQ and BCC, respectively. Nonetheless, lake/catchment morphometry and variables linked to solutes sources (lithology, atmospheric deposition and soil properties) were also included in some models. Overall, BCC and BCQ were positively affected by temperature, precipitation as rain and sulphate depositions, and negatively influenced by precipitation as snow and the number of frost days. Multivariate models explaining up to 69% of variation in BCC and BCQ were developed. This study shows the strong impact of climatic drivers on base cation budgets and, thus, on mineral weathering at the regional scale on the Canadian Shield. © 2014 Elsevier Ltd. },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1016/j.apgeochem.2014.11.013 },
    KEYWORDS = { Atmospheric chemistry; Budget control; Calcium; Climate change; Deposition; Forestry; Lakes; Lithology; Meteorological problems; Multivariant analysis; Positive ions; Precipitation (meteorology); Rain; Runoff; Weathering, Atmospheric depositions; Bioclimatic gradients; Catchment characteristics; Climate-related effects; Environmental factors; Multivariate models; Multivariate statistical approaches; Spatial variability, Catchments, bioclimatology; cation; environmental factor; forest ecosystem; lake water; water chemistry; weathering, Canada; Canadian Shield; Quebec [Canada] },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-84920116042&partnerID=40&md5=1b31bcccbbc68809ac437f1d09527d4e },
}

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