The objective of this study was to investigate the relationships between single tree measurements for height and diameter and available individual areas per tree (determined by the areas of THIESSEN polygons) in even-aged stands of larch, Extensive data sets from a field trial with 27 entries of Larix europaea, Larix leptolepis and their hybrids were available. Single tree measurements for height and diameter of this trial have been analyzed for 6 stages of stand development (ages: 11, 13, 19, 50, 53, 56 years). The correlation between height and area was negative and small (-0.17, -0.18, -0.22, -0.20, -0.28, -0.31), while the correlations between diameter and area are separated into two clearly differentiated parts: negative with small numerical values (-0.15, -0.14, -0.17) for the early period of stand development (up to 19 years) and positive with small numerical values (+0.19, +0.22, +0.24) for the late period of stand development (up to 56 years). In this study, the areas of THIESSEN polygons have proven to be poor predictors of tree height and tree diameter. But, they are a reasonable measure of two-dimensional area available to comparable individuals and may provide useful independent variables for prediction approaches in even-aged populations.
