AndrieuxBeguinBergeronEtAl2018

Référence

Andrieux, B., Beguin, J., Bergeron, Y., Grondin, P. and Pare, D. (2018) Drivers of postfire soil organic carbon accumulation in the boreal forest. Global Change Biology, 24(10):4797-4815. (URL )

Résumé

Abstract The accumulation of soil carbon (C) is regulated by a complex interplay between abiotic and biotic factors. Our study aimed to identify the main drivers of soil C accumulation in the boreal forest of eastern North America. Ecosystem C pools were measured in 72 sites of fire origin that burned 2–314 years ago over a vast region with a range of ∆ mean annual temperature of 3°C and one of ∆ 500 mm total precipitation. We used a set of multivariate a priori causal hypotheses to test the influence of time since fire (TSF), climate, soil physico-chemistry and bryophyte dominance on forest soil organic C accumulation. Integrating the direct and indirect effects among abiotic and biotic variables explained as much as 50\% of the full model variability. The main direct drivers of soil C stocks were: TSF >bryophyte dominance of the FH layer and metal oxide content >pH of the mineral soil. Only climate parameters related to water availability contributed significantly to explaining soil C stock variation. Importantly, climate was found to affect FH layer and mineral soil C stocks indirectly through its effects on bryophyte dominance and organo-metal complexation, respectively. Soil texture had no influence on soil C stocks. Soil C stocks increased both in the FH layer and mineral soil with TSF and this effect was linked to a decrease in pH with TSF in mineral soil. TSF thus appears to be an important factor of soil development and of C sequestration in mineral soil through its influence on soil chemistry. Overall, this work highlights that integrating the complex interplay between the main drivers of soil C stocks into mechanistic models of C dynamics could improve our ability to assess C stocks and better anticipate the response of the boreal forest to global change.

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@ARTICLE { AndrieuxBeguinBergeronEtAl2018,
    AUTHOR = { Andrieux, B. and Beguin, J. and Bergeron, Y. and Grondin, P. and Pare, D. },
    TITLE = { Drivers of postfire soil organic carbon accumulation in the boreal forest },
    JOURNAL = { Global Change Biology },
    YEAR = { 2018 },
    VOLUME = { 24 },
    NUMBER = { 10 },
    PAGES = { 4797-4815 },
    ABSTRACT = { Abstract The accumulation of soil carbon (C) is regulated by a complex interplay between abiotic and biotic factors. Our study aimed to identify the main drivers of soil C accumulation in the boreal forest of eastern North America. Ecosystem C pools were measured in 72 sites of fire origin that burned 2–314 years ago over a vast region with a range of ∆ mean annual temperature of 3°C and one of ∆ 500 mm total precipitation. We used a set of multivariate a priori causal hypotheses to test the influence of time since fire (TSF), climate, soil physico-chemistry and bryophyte dominance on forest soil organic C accumulation. Integrating the direct and indirect effects among abiotic and biotic variables explained as much as 50\% of the full model variability. The main direct drivers of soil C stocks were: TSF >bryophyte dominance of the FH layer and metal oxide content >pH of the mineral soil. Only climate parameters related to water availability contributed significantly to explaining soil C stock variation. Importantly, climate was found to affect FH layer and mineral soil C stocks indirectly through its effects on bryophyte dominance and organo-metal complexation, respectively. Soil texture had no influence on soil C stocks. Soil C stocks increased both in the FH layer and mineral soil with TSF and this effect was linked to a decrease in pH with TSF in mineral soil. TSF thus appears to be an important factor of soil development and of C sequestration in mineral soil through its influence on soil chemistry. Overall, this work highlights that integrating the complex interplay between the main drivers of soil C stocks into mechanistic models of C dynamics could improve our ability to assess C stocks and better anticipate the response of the boreal forest to global change. },
    DOI = { 10.1111/gcb.14365 },
    EPRINT = { https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.14365 },
    KEYWORDS = { boreal forest, carbon dynamic, carbon sequestration, carbon stock, climate change, fire, soil carbon },
    OWNER = { Daniel Lesieur },
    TIMESTAMP = { 2018-10-09 },
    URL = { https://onlinelibrary.wiley.com/doi/abs/10.1111/gcb.14365 },
}

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