Crown reaction and acclimation to cyclical V-trimming of city trees: An analysis using terrestrial laser scanning |
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| Affiliation: | 1. Department of Biological Sciences, Centre for Forest Research (CEF) and NSERC/Hydro-Québec Chair on Tree Growth Control, Université du Québec à Montréal, Centre-Ville Station, P.O. Box 8888, Montreal, Qc H3C 3P8, Canada;2. Department of Natural Resources, Institute of Temperate Forest Sciences and Centre for Forest Research (CEF), Université du Québec en Outaouais, 58 Rue Principale, Ripon, Qc J0V 1V0, Canada;1. Chair of Silviculture, Faculty of Environment and Natural Resources, Freiburg University, Tennenbacherstr. 4, 79108 Freiburg, Germany;2. Chair of Forest Inventory and Remote Sensing, Georg-August-Universität Göttingen, Büsgenweg 5, 37077 Göttingen, Germany;1. Center for Forest Research, Université du Québec à Montréal, P.O. Box 8888, Succursale Centre-ville, Montréal, QC, H3C 3P8, Canada;2. Facultad de Ciencias Agrarias, Universidad del Cauca, Calle 5 N° 4-70, Popayán, Colombia;3. Programa de Biología, Facultad de Ciencias Naturales y Matemáticas, Universidad del Rosario, Carrera 24 No. 63C-69, Bogotá, Colombia;4. Institute of Temperate Forest Sciences (ISFORT), University of Quebec in Outaouais (UQO), 58 Rue Principale, Ripon, QC, J0 V 1V0, Canada;1. Institute of Remote Sensing and Geographic Information Systems, School of Earth and Space Science, Peking University, 100871 Beijing, China;2. Laboratory of Geo-Information Science and Remote Sensing, Wageningen University, 6708 PB Wageningen, The Netherlands;1. Laboratory of Geo-Information Science and Remote Sensing, Wageningen University, Droevendaalsesteeg 3, 6708 PB Wageningen, the Netherlands;2. Center for International Forestry Research (CIFOR), P.O. Box 0113 BOCBD, Bogor 16000, Indonesia;3. Environmental Change Institute, School of Geography and the Environment, South Parks Road, University of Oxford, OX1 3QY, UK;4. Department of Biology, Sonoma State University, 1801 East Cotati Avenue, Rohnert Park, CA 94928, USA;1. The Silva Tarouca Research Institute, Department of Forest Ecology, Lidicka 25/27, Brno 602 00, Czech Republic;2. Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Forest Management and Applied Geoinformatics, Zemedelska 3, Brno 613 00, Czech Republic |
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| Abstract: | Trimming is an important practice for reducing potential contact between trees and power lines. V-trimming occurs when a tree is located directly under the electrical wires and results in the formation of a bilateral crown, but not much is known about a tree’s reaction and acclimation to such a repeated stress in an urban context.Using Terrestrial Laser Scanning (TLS), we present a study that focuses on documenting (i) short term effect of V-trimming on the tree structure, through the quantification and analysis of the dispersion of trimming induced branch loss and subsequent growth reaction, and, (ii) long term acclimation (i.e. changes in biomass location) of tree structure to repeated unidirectional trimming. A voxelisation method was used to derive space exploration metrics from TLS data based on explored volume quantification and voxels dispersion within the tree crown.Our results show that V-trimming induces a significant decrease in explored crown space volume (12.8% on average) but that this loss is regained by trimmed trees within only 1 year following trimming thanks to a rapid regrowth rate. This was supported by an analysis of radial growth that showed that the growth of trimmed trees was greater than non-trimmed trees although this tendency was not statistically significant. In our study this regrowth was achieved without suckering; instead the regrowth mainly occurred within the crown periphery. We also observed that trimming had a significant influence on the way trees explore space with their crowns. While non-trimmed trees explored space preferentially toward a South direction, trimmed trees explored space in directions perpendicular to the wires (East and West). We also observed that crown biomass was located more in the extreme crown periphery in trimmed trees compared to non-trimmed trees. |
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| Keywords: | Branch loss Crown acclimation Regrowth Terrestrial laser scanner Tree architecture V-trimming |
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