{"id":82759,"date":"2019-01-30T12:14:55","date_gmt":"2019-01-30T17:14:55","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/sugar-maple-response-additions\/"},"modified":"2019-01-30T12:14:55","modified_gmt":"2019-01-30T17:14:55","slug":"sugar-maple-response-additions","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/sugar-maple-response-additions\/","title":{"rendered":"Soil solution and sugar maple response to NH4 NO3 additions in a base-poor northern hardwood forest of Qu\u00e9bec, Canada"},"content":{"rendered":"\n<p>Published in <strong>Environment Monitoring and Assessment 155: 177-190<\/strong><\/p>\n<p>Nitrogen additions (NH<sub>4<\/sub>NO<sub>3<\/sub>) at rates of three- and ten-fold ambient atmospheric deposition (8.5 kg ha<sup>\u22121<\/sup> year<sup>\u22121<\/sup>) were realised in an acid- and base-poor northern hardwood forest of Qu\u00e9bec, Canada. Soil solution chemistry, foliar chemistry, crown dieback and basal area growth of sugar maple (<em>Acer saccharum<\/em> Marsh.) were measured. Except for a transitory increase of NO<sub>3<\/sub> and NH<sub>4<\/sub> concentrations, there was no persistent increase in their level in soil solution 3 years after N treatments, with the exception of one plot out of three, that received the highest N addition, beginning to show persistent and high NO<sub>3<\/sub> concentrations after 2 years of N additions. Three years of N additions have significantly increased the N DRIS index of sugar maple but not N foliar concentration. Potassium, Ca and Mn foliar concentrations, as well as P and Ca DRIS indices, decreased in treated plots after 3 years. No treatment effect was observed for basal area growth and dieback rate. One unexpected result was the significant decrease in foliar Ca even in the treated plots that received low N rates, despite the absence of significant NO<sub>3<\/sub>-induced leaching of Ca. The mechanism responsible for the decrease in foliar Ca is not known. Our results, however, clearly demonstrate that increased N deposition at sites with low base saturation may affect Ca nutrition even when clear signs of N saturation are not observed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Published in Environment Monitoring and Assessment 155: 177-190 Nitrogen additions (NH4NO3) at rates of three- and ten-fold ambient atmospheric deposition (8.5 kg ha\u22121 year\u22121) were realised in an acid- and base-poor northern hardwood forest of Qu\u00e9bec, Canada. Soil solution chemistry, foliar chemistry, crown dieback and basal area growth of sugar maple (Acer saccharum Marsh.) were [&hellip;]<\/p>\n","protected":false},"template":"","format":"standard","cptt_secteur":[1179],"cptt_theme":[1183,1185,1180,1181],"cptt_categ_publi":[1149],"cptt_auteurs_ministeriels":[1091,1099],"class_list":["post-82759","cpt_publication","type-cpt_publication","status-publish","format-standard","hentry","cptt_secteur-forests","cptt_theme-ecosystems-and-environment","cptt_theme-forest-ecology","cptt_theme-forestry-research","cptt_theme-forests","cptt_categ_publi-scientific-article","cptt_auteurs_ministeriels-d-houle","cptt_auteurs_ministeriels-j-d-moore"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Soil solution and sugar maple response to NH4 NO3 additions in a base-poor northern hardwood forest of Qu\u00e9bec, Canada - Minist\u00e8re des Ressources naturelles et des For\u00eats<\/title>\n<meta name=\"description\" content=\"Nitrogen additions at rates of three- and ten-fold ambient atmospheric deposition were realised in an acid- and base-poor forest\" \/>\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\/sugar-maple-response-additions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Soil solution and sugar maple response to NH4 NO3 additions in a base-poor northern hardwood forest of Qu\u00e9bec, Canada - 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