Microclimatic and spruce growth gradients adjacent to young aspen stands |
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| Institution: | 1. Université de Lyon, F-69000 Lyon, France;2. Université Lyon 1, CNRS, UMR5558, Laboratoire de Biométrie et Biologie Evolutive, F-69622 Villeurbanne, France;3. National Park “Bavarian Forest”, Freyunger Str. 2, 94481 Grafenau, Germany;4. 1230 Oakland Street, Hendersonville, NC, USA;5. UMR 5175, Centre d''Ecologie Fonctionnelle et Evolutive, campus CNRS, 1919 route de Mende, 34293, Montpellier Cedex 5, France;6. Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Winterthurerstr. 260, 8057 Zurich, Switzerland;1. Laboratory of Atmospheric Pollution and Pollution Control Engineering of Atmospheric Pollutants, Department of Environmental Engineering, Democritus University of Thrace, 67100 Xanthi, Greece;2. Department of Meteorology and Climatology, School of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;3. Laboratory of Atmospheric physics, Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;4. Department of Physics, University of Girona, 17071 Girona, Spain;5. Instituto Pirenaico de Ecología, Consejo Superior de Investigaciones Científicas (CSIC), 50059 Zaragoza, Spain;1. Rhode Island/Hasbro Childrens'' Hospitals & Miriam Hospital, Warren Alpert School of Medicine at Brown University, Providence, RI, United States;2. Cardiac Regenerative Surgery Research Laboratories, Cardiology and Cardiac Surgery of The Ward Family Heart Center, Children''s Mercy Hospital, Kansas City, MO, United States;3. Texas Biomedical Research Institute, San Antonio, TX, United States |
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| Abstract: | Effective utilization of a patch or cluster approach to growing aspen-white spruce mixtures in the boreal forest requires an understanding of how the faster growing aspen patches influence microclimate and spruce growth in adjacent spruce patches. In this paper we examine, how young (11–13 year old) aspen (Populus tremuloides Michx) patches influence microclimatic conditions in adjacent openings and how these are reflected in the growth of white spruce (Picea glauca Moench] Voss) on three boreal mixedwood sites in west-central Alberta, Canada. Light levels increased continuously across the aspen stand boundary and reached maximum levels within the opening, while soil moisture was highest near the edge of the opening and then decreased with distance into the aspen stand or into the adjacent opening north of the aspen stand. Light levels were reduced over a greater distance when moving north from aspen stand edges compared to openings located south of the young aspen. These young aspen stands provided growing season frost protection within one tree length from the edge. The growth of white spruce was positively related to initial crown size and either light levels or distance from the edge. Stem volume growth was best predicted by initial tree size and the light levels at the midcrown of seedlings. |
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