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Regional paleofire regimes affected by non-uniform climate, vegetation and human drivers

Climate, vegetation and humans act on biomass burning at different spatial and temporal scales. In this study, we used a dense network of sedimentary charcoal records from eastern Canada to reconstruct regional biomass burning history over the last 7000 years at the scale of four potential vegetatio...

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Autores principales: Blarquez, Olivier, Ali, Adam A., Girardin, Martin P., Grondin, Pierre, Fréchette, Bianca, Bergeron, Yves, Hély, Christelle
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4557068/
https://www.ncbi.nlm.nih.gov/pubmed/26330162
http://dx.doi.org/10.1038/srep13356
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author Blarquez, Olivier
Ali, Adam A.
Girardin, Martin P.
Grondin, Pierre
Fréchette, Bianca
Bergeron, Yves
Hély, Christelle
author_facet Blarquez, Olivier
Ali, Adam A.
Girardin, Martin P.
Grondin, Pierre
Fréchette, Bianca
Bergeron, Yves
Hély, Christelle
author_sort Blarquez, Olivier
collection PubMed
description Climate, vegetation and humans act on biomass burning at different spatial and temporal scales. In this study, we used a dense network of sedimentary charcoal records from eastern Canada to reconstruct regional biomass burning history over the last 7000 years at the scale of four potential vegetation types: open coniferous forest/tundra, boreal coniferous forest, boreal mixedwood forest and temperate forest. The biomass burning trajectories were compared with regional climate trends reconstructed from general circulation models, tree biomass reconstructed from pollen series, and human population densities. We found that non-uniform climate, vegetation and human drivers acted on regional biomass burning history. In the open coniferous forest/tundra and dense coniferous forest, the regional biomass burning was primarily shaped by gradual establishment of less climate-conducive burning conditions over 5000 years. In the mixed boreal forest an increasing relative proportion of flammable conifers in landscapes since 2000 BP contributed to maintaining biomass burning constant despite climatic conditions less favourable to fires. In the temperate forest, biomass burning was uncoupled with climatic conditions and the main driver was seemingly vegetation until European colonization, i.e. 300 BP. Tree biomass and thus fuel accumulation modulated fire activity, an indication that biomass burning is fuel-dependent and notably upon long-term co-dominance shifts between conifers and broadleaf trees.
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spelling pubmed-45570682015-09-11 Regional paleofire regimes affected by non-uniform climate, vegetation and human drivers Blarquez, Olivier Ali, Adam A. Girardin, Martin P. Grondin, Pierre Fréchette, Bianca Bergeron, Yves Hély, Christelle Sci Rep Article Climate, vegetation and humans act on biomass burning at different spatial and temporal scales. In this study, we used a dense network of sedimentary charcoal records from eastern Canada to reconstruct regional biomass burning history over the last 7000 years at the scale of four potential vegetation types: open coniferous forest/tundra, boreal coniferous forest, boreal mixedwood forest and temperate forest. The biomass burning trajectories were compared with regional climate trends reconstructed from general circulation models, tree biomass reconstructed from pollen series, and human population densities. We found that non-uniform climate, vegetation and human drivers acted on regional biomass burning history. In the open coniferous forest/tundra and dense coniferous forest, the regional biomass burning was primarily shaped by gradual establishment of less climate-conducive burning conditions over 5000 years. In the mixed boreal forest an increasing relative proportion of flammable conifers in landscapes since 2000 BP contributed to maintaining biomass burning constant despite climatic conditions less favourable to fires. In the temperate forest, biomass burning was uncoupled with climatic conditions and the main driver was seemingly vegetation until European colonization, i.e. 300 BP. Tree biomass and thus fuel accumulation modulated fire activity, an indication that biomass burning is fuel-dependent and notably upon long-term co-dominance shifts between conifers and broadleaf trees. Nature Publishing Group 2015-09-02 /pmc/articles/PMC4557068/ /pubmed/26330162 http://dx.doi.org/10.1038/srep13356 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Blarquez, Olivier
Ali, Adam A.
Girardin, Martin P.
Grondin, Pierre
Fréchette, Bianca
Bergeron, Yves
Hély, Christelle
Regional paleofire regimes affected by non-uniform climate, vegetation and human drivers
title Regional paleofire regimes affected by non-uniform climate, vegetation and human drivers
title_full Regional paleofire regimes affected by non-uniform climate, vegetation and human drivers
title_fullStr Regional paleofire regimes affected by non-uniform climate, vegetation and human drivers
title_full_unstemmed Regional paleofire regimes affected by non-uniform climate, vegetation and human drivers
title_short Regional paleofire regimes affected by non-uniform climate, vegetation and human drivers
title_sort regional paleofire regimes affected by non-uniform climate, vegetation and human drivers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4557068/
https://www.ncbi.nlm.nih.gov/pubmed/26330162
http://dx.doi.org/10.1038/srep13356
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