Micro-variations in yellow birch (Betula alleghaniensis) growth conditions after patch scarification |
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| Institution: | 1. Département des sciences du bois et de la forêt, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4;2. Ressources Naturelles Canada, Service canadien des forêts, Centre de Foresterie des Laurentides, 1055 rue du PEPS, CP 10308, Succ. Sainte-Foy, Québec, Canada G1V 4C7;1. Public Enterprise Sachsenforst, Bonnewitzer Straße 34, 01796 Pirna, Germany;2. Forestry Research and Competence Centre, ThüringenForst AöR, Jägerstraße 1, 99867 Gotha, Germany;1. Stock Enhancement Group, Tohoku National Fisheries Research Institute, Fisheries Research Agency, Iwate, Japan;2. Graduate School of Fisheries Sciences and Environmental Studies, Nagasaki University, Nagasaki, Japan;1. Research School of Biology, The Australian National University, Canberra, ACT, Australia;2. Department of Biological Sciences, Macquarie University, Sydney, NSW, Australia;1. Associate Professor, Dept of Community Medicine, Armed Forces Medical College, Pune 411040, India;2. Professor, Dept of Community Medicine, Armed Forces Medical College, Pune 411040, India;3. Classified Specialist (Medicine and Cardiology), Military Hospital, Jalandhar, India;4. Associate Professor, Dept of Pharmacology, Armed Forces Medical College, Pune 411040, India;1. CRIStAL (UMR CNRS 9189, University of Lille), 59650 Villeneuve d''Ascq, France;2. INRIA Lille-Nord Europe, France |
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| Abstract: | The abundance of poor quality yellow birch stands resulting from diameter limit cuts poses important regeneration challenges since seed production is uncertain, adequate seedbeds are rare and competition very severe. The present study aims at evaluating variations in seedling growth, temperature, soil humidity and nutrient availability for the whole range of seedbeds created by a patch scarification treatment. In three poor quality stands, soil temperature and humidity, nutrient availability and seedling morphology were monitored on undisturbed forest floor, at different places in 2 m wide scarified patches, and on mounds formed by the displaced material. Even though the study associated some variations in temperature and humidity to different microsite positions, the effect on nutrient availability was more pronounced. Hence, the study found better nutrient availability on mounds in comparison with patches as well as at the border of patches. Soil nutrient availability as measured with in situ ion exchange resin declined very rapidly in the interior of scarified patch (within 5 cm for the border) suggesting that small scarified patches combined with control of vegetation competition should provide a better environment for seedling growth. Growth parameters of yellow birch seedlings were not correlated to measured soil parameters suggesting that there were important effects of uncontrolled factors. |
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