{"id":82246,"date":"2019-01-30T12:18:33","date_gmt":"2019-01-30T17:18:33","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/evaluating-electrical-resistivity-tomography-crown-area\/"},"modified":"2019-01-30T12:18:33","modified_gmt":"2019-01-30T17:18:33","slug":"evaluating-electrical-resistivity-tomography-crown-area","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/evaluating-electrical-resistivity-tomography-crown-area\/","title":{"rendered":"Evaluating electrical resistivity tomography and crown surface area to estimate leaf area of sugar maple and yellow birch"},"content":{"rendered":"\n<p>Published in <b>Ecohydrology 11(7): e2014. <a href=\"https:\/\/doi.org\/10.1002\/eco.2014\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/doi.org\/10.1002\/eco.2014<\/a><\/b><\/p>\n<p>Sapwood area is an important parameter for estimating transpiration at whole-tree and watershed scales, given that it is used for scaling up point sap flow measurements. However, its determination may be difficult, particularly for large-diameter trees of diffuse-porous, broad-leaved species. By delineating only the highly conductive sapwood, electrical resistivity tomography (ERT) may be more appropriate than sapwood dyeing for estimating tree sapwood area. We compared sapwood area measurements made with ERT with those that were obtained from wood dyeing, assuming that the more adequate measure was that which was best correlated with tree leaf area. To achieve this objective, we sampled 31 sugar maple (<em>Acer saccharum<\/em> Marsh.) and 20 yellow birch (<em>Betula alleghaniensis<\/em> Britt.) trees covering a large range of tree diameters and leaf areas from one site located in eastern Canada. Also, 79 sugar maple trees were sampled in two other sites to document the estimation of tree leaf area over a large territory. The sapwood area that was determined from ERT appeared to be the best method for scaling up point sap flow measurements to whole-tree transpiration. The predictive ability of ERT was particularly greater than that of wood dyeing when they were both measured at 1&nbsp;m. If the objective is to estimate tree leaf area rather than sapwood area, the crown surface area would provide a useful substitute for the ERT method because it is rapid and easy to measure while serving a robust predictor applicable over a large territory.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Published in Ecohydrology 11(7): e2014. https:\/\/doi.org\/10.1002\/eco.2014 Sapwood area is an important parameter for estimating transpiration at whole-tree and watershed scales, given that it is used for scaling up point sap flow measurements. However, its determination may be difficult, particularly for large-diameter trees of diffuse-porous, broad-leaved species. By delineating only the highly conductive sapwood, electrical resistivity [&hellip;]<\/p>\n","protected":false},"template":"","format":"standard","cptt_secteur":[1179],"cptt_theme":[1180,1181,1182],"cptt_categ_publi":[1149],"cptt_auteurs_ministeriels":[1068],"class_list":["post-82246","cpt_publication","type-cpt_publication","status-publish","format-standard","hentry","cptt_secteur-forests","cptt_theme-forestry-research","cptt_theme-forests","cptt_theme-silviculture","cptt_categ_publi-scientific-article","cptt_auteurs_ministeriels-s-bedard"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Evaluating electrical resistivity tomography and crown surface area to estimate leaf area of sugar maple and yellow birch - Minist\u00e8re des Ressources naturelles et des For\u00eats<\/title>\n<meta name=\"description\" content=\"By delineating only the highly conductive sapwood, electrical resistivity tomography may appropriate for estimating tree sapwood area.\" \/>\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\/evaluating-electrical-resistivity-tomography-crown-area\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Evaluating electrical resistivity tomography and crown surface area to estimate leaf area of sugar maple and yellow birch - 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