Crown and tree allometry of open-grown ash (<Emphasis Type="Italic">Fraxinus excelsior</Emphasis> L.) and sycamore (<Emphasis Type="Italic">Acer pseudoplatanus</Emphasis> L.)
(1) Forest Research Institute of Baden-Württemberg, P.O. Box 708, 79100 Freiburg, Germany;(2) Institute for Forest Growth, Albert-Ludwigs-University of Freiburg, 79085 Freiburg, Germany