Üllar Rannik, University of Helsinki, Helsinki, Finland; and A. Gaman, P. Aalto, P. Keronen, T. Vesala, and M. Kulmala

Lutz W. Jaeger, University of Freiburg, Freiburg, Germany; and A. Kessler

Eric Lamaud, National Institute of Agronomic Research, Villenave d'Ornon, France; and M. Irvine

Helen C. Sellars, Forest Research, Midlothian, United Kingdom; and B. A. Gardiner, A. P. Morse, and A. J. Challinor

Warren E. Heilman, USDA Forest Service, East Lansing, MI; and M. R. Holdaway, R. M. Teclaw, and J. E. Eenigenburg

William J. Massman, USDA Forest Service, Fort Collins, CO