Circumference of tree trunks in Poplar tree plantations

Circumference of tree trunks at breast height (approximately 140 cm from the ground) in two Poplar tree plantations (approximately 10 and 15 years old plantations) on the outskirts of Nyíradony and respectively Nyírbogát, Hungary. The plantations have the distinct characteristic of minimal human influence after their establishment. The measurements were taken on May 3, 2023. Data from the younger plantation: Filename: Circumference_10y_plantation.csv/Circumference_10y_plantation.xlsx Data from the older plantation: Filename: Circumference_15y_plantation.csv/Circumference_15y_plantation.xlsx The data was measured manually using a standard tailor's tape measure. The circumferences are measured in centimeters. A "0" value in the matrix indicates that the corresponding tree is missing (either dried out or not planted, etc.).