{"id":82171,"date":"2019-01-30T12:18:33","date_gmt":"2019-01-30T17:18:33","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/postfire-soil-organic-carbon-accumulation-boreal-forest\/"},"modified":"2019-01-30T12:18:33","modified_gmt":"2019-01-30T17:18:33","slug":"postfire-soil-organic-carbon-accumulation-boreal-forest","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/postfire-soil-organic-carbon-accumulation-boreal-forest\/","title":{"rendered":"Drivers of postfire soil organic carbon accumulation in the boreal forest"},"content":{"rendered":"\n

Published in Global Change Biology 24(10): 4797-4815. https:\/\/doi.org\/10.1111\/gcb.14365<\/a><\/strong><\/p>\n

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\u2013314\u00a0years ago over a vast region with a range of \u2206 mean annual temperature of 3\u00b0C and one of \u2206 500\u00a0mm 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.<\/p>\n","protected":false},"excerpt":{"rendered":"

Published in Global Change Biology 24(10): 4797-4815. https:\/\/doi.org\/10.1111\/gcb.14365 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 […]<\/p>\n","protected":false},"template":"","format":"standard","cptt_secteur":[1179],"cptt_theme":[1185,1180,1181],"cptt_categ_publi":[1149],"cptt_auteurs_ministeriels":[1087],"class_list":["post-82171","cpt_publication","type-cpt_publication","status-publish","format-standard","hentry","cptt_secteur-forests","cptt_theme-forest-ecology","cptt_theme-forestry-research","cptt_theme-forests","cptt_categ_publi-scientific-article","cptt_auteurs_ministeriels-p-grondin"],"acf":[],"yoast_head":"\nDrivers of postfire soil organic carbon accumulation in the boreal forest - Minist\u00e8re des Ressources naturelles et des For\u00eats<\/title>\n<meta name=\"description\" content=\"Our study aimed to identify the main drivers of soil carbon (C) accumulation in the boreal forest of eastern North America.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/postfire-soil-organic-carbon-accumulation-boreal-forest\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Drivers of postfire soil organic carbon accumulation in the boreal forest - 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