Institution: | Department of Natural Resources Science, University of Rhode Island, RI 02879, U.S.A., email:; Department of Forest Science, University of Tuscia, 01100 Viterbo, Italy; Department of Forest Science, Oregon State University, Corvallis, OR 97331–5752, U.S.A.; Winrock International, c/o 831 NW Sundance Circle, Corvallis, OR 97330, U.S.A. |