{"id":82265,"date":"2023-05-09T13:51:34","date_gmt":"2023-05-09T17:51:34","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/fine-scale-assessment-seasonal-intra-seasonal-spatial-dynamics\/"},"modified":"2023-05-09T13:51:34","modified_gmt":"2023-05-09T17:51:34","slug":"fine-scale-assessment-seasonal-intra-seasonal-spatial-dynamics","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/fine-scale-assessment-seasonal-intra-seasonal-spatial-dynamics\/","title":{"rendered":"Fine scale assessment of seasonal, intra-seasonal and spatial dynamics of soil CO<sub>2<\/sub> effluxes over a balsam fir-dominated perhumid boreal landscape"},"content":{"rendered":"\n<p style=\"text-align: left;\"><strong>Published in Agricultural and Forest Meteorology 335(January): 109469. <a href=\"https:\/\/doi.org\/10.1016\/j.agrformet.2023.109469\" target=\"_blank\" rel=\"noopener\">https:\/\/doi.org\/10.1016\/j.agrformet.2023.109469<\/a> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-825\" src=\"\/wp-content\/uploads\/2015\/07\/lien_externe.png\" alt=\"\" width=\"9\" height=\"9\" \/><\/strong><\/p>\n<p style=\"text-align: left;\">Total soil CO<sub>2<\/sub> efflux (F<sub>CO2<\/sub>) is the second most important carbon flux after photosynthesis in boreal forests. However, accurate modelling of F<sub>CO2 <\/sub>remains challenging because of its high variability, both temporally and spatially. Using an Abies balsamea-dominated boreal landscape in Quebec (eastern Canada) as a case study, we modelled seasonal, intra-seasonal and spatial variability of F<sub>CO2<\/sub> using climate variables and topographic and canopy structure attributes derived from Light Detection and Ranging (LiDAR) and assessed their respective contributions to soil CO<sub>2<\/sub> emissions. Weekly point measurements of F<sub>CO2<\/sub> at 99 sites were taken over an area of 122 ha between June and October 2020. The seasonal component of F<sub>CO2<\/sub> was quantified and subtracted from FCO2 measurements to isolate the spatial and intra-seasonal components of the flux. The two components were then modelled using a Random Forest Regression model and studied using accumulated local effect plots (ALE plots). Our approach explained 81% of the variation in F<sub>CO2<\/sub>: the seasonal pattern explained 36% of the variation in F<sub>CO2<\/sub> measurements, while spatial and intra-seasonal patterns together explained 45%. The most important factors explaining spatial variation were vegetation height and the slope height. Average air temperature of the last two days before efflux measurements was the most important factor explaining intra-seasonal variation. The proposed methodology makes it possible to predict F<sub>CO2<\/sub> from external factors derived from climate and remote sensing data and enables the decomposition of F<sub>CO2<\/sub> into its seasonal, intra-seasonal and spatial components. Our results demonstrate the importance of spatial and intra-seasonal variations in F<sub>CO2<\/sub> compared to seasonal variation, a finding that has implications for the measurement and modelling of F<sub>CO2<\/sub> at landscape and global scales.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Published in Agricultural and Forest Meteorology 335(January): 109469. https:\/\/doi.org\/10.1016\/j.agrformet.2023.109469 Total soil CO2 efflux (FCO2) is the second most important carbon flux after photosynthesis in boreal forests. However, accurate modelling of FCO2 remains challenging because of its high variability, both temporally and spatially. Using an Abies balsamea-dominated boreal landscape in Quebec (eastern Canada) as a case [&hellip;]<\/p>\n","protected":false},"template":"","format":"standard","cptt_secteur":[1179],"cptt_theme":[1183,1180,1181],"cptt_categ_publi":[1149],"cptt_auteurs_ministeriels":[1079,1113,1117],"class_list":["post-82265","cpt_publication","type-cpt_publication","status-publish","format-standard","hentry","cptt_secteur-forests","cptt_theme-ecosystems-and-environment","cptt_theme-forestry-research","cptt_theme-forests","cptt_categ_publi-scientific-article","cptt_auteurs_ministeriels-drolet-guillaume","cptt_auteurs_ministeriels-j-d-sylvain","cptt_auteurs_ministeriels-syl-tremblay"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Fine scale assessment of seasonal, intra-seasonal and spatial dynamics of soil CO2 effluxes over a balsam fir-dominated perhumid boreal landscape - Minist\u00e8re des Ressources naturelles et des For\u00eats<\/title>\n<meta name=\"description\" content=\"Total soil CO2 efflux (FCO2) is the second most important carbon flux after photosynthesis in boreal forests.\" \/>\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\/fine-scale-assessment-seasonal-intra-seasonal-spatial-dynamics\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fine scale assessment of seasonal, intra-seasonal and spatial dynamics of soil CO2 effluxes over a balsam fir-dominated perhumid boreal landscape - 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