Individual tree height and diameter measurements of Birch spp. in central Sweden (2005 - 2022)

The spacing trial in Skräddarbo was established in 1989 on former agricultural land, testing four square spacing configurations: 1.3 × 1.3 m, 1.5 × 1.5 m, 1.8 × 1.8 m, and 2.6 × 2.6 m. Each spacing treatment was replicated four times for both silver birch and downy birch, totaling 32 plots across approximately 1.2 hectares. Each plot was planted with 100 seedlings, with varying plot sizes based on spacing. Species were randomly assigned to pre-determined plot locations. Data collection began in 2005 and continued annually until 2022 (except 2021). The data includes individual tree height, diameter and living crown measurements. Diameter measurements were recorded cross-sectionally, using a digital caliper, whereas tree height and living crown measurements were done using a hypsometer (Haglöf Vertex Laser Geo). Additional variables include plot area, tree id numbers and other constant variables. The data package is complete with the last revision done by the author in 2022.