Research Article | Open Access

Volume 2024 |Article ID 0264 | https://doi.org/10.34133/plantphenomics.0264

Evaluating the Influence of Row Orientation and Crown Morphology on Growth of Pinus taeda L. with Drone-Based Airborne Laser Scanning

Matthew J. Sumnall ,¹ David R. Carter,¹ Timothy J. Albaugh,¹ Rachel L. Cook,² Otávio C. Campoe,³ Rafael A. Rubilar^4,5

¹Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and StateUniversity, Blacksburg, VA 24061, USA
²Department of Forestry and Environmental Resources, NorthCarolina State University, Raleigh, NC 27695, USA
³Universidade Federal de Lavras, Lavras, MG, Brazil
⁴Cooperativa de Productividad Forestal, Departamento de Silvicultura, Facultad de Ciencias Forestales,Universidad de Concepción, Concepción, Chile
⁵Centro Nacional de Excelencia para la Industria de laMadera (CENAMAD) - ANID BASAL FB210015, Pontificia Universidad Católica de Chile, Santiago, Chile

Abstract

The tree crown’s directionality of growth may be an indicator of how aggressive the tree is in terms of foraging for light. Airborne drone laser scanning (DLS) has been used to accurately classify individual tree crowns (ITCs) and derive size metrics related to the crown. We compare ITCs among 6 genotypes exhibiting different crown architectures in managed loblolly pine (Pinus taeda L.) in the United States. DLS data are classified into ITC objects, and we present novel methods to calculate ITC shape metrics. Tree stems are located using (a) model-based clustering and (b) weighting cluster-based size. We generated ITC shape metrics using 3-dimensional (3D) alphashapes in 2 DLS acquisitions of the same location, 4 years apart. Crown horizontal distance from the stem was estimated at multiple heights, in addition to calculating 3D volume in specific azimuths. Crown morphologies varied significantly (P < 0.05) spatially, temporally, and among the 6 genotypes. Most genotypes exhibited larger crown volumes facing south (150° to 173°). We found that crown asymmetries were consistent with (a) the direction of solar radiation, (b) the spatial arrangement and proximity of the neighboring crowns, and (c) genotype. Larger crowns were consistent with larger increases in stem volume, but that increases in the southern portions of crown volume were consistent with larger stem volume increases, than in the north. This finding suggests that row orientation could influence stem growth rates in plantations, particularly impacting earlier development. These differences can potentially reduce over time, especially if stands are not thinned in a timely manner once canopy growing space has diminished.