1. Biology and Physical Geography Unit, Science Building, University of British Columbia, Okanagan campus; 3333 University Way Kelowna BC V1V 1V7 Canada
2. Forest Sciences Department; University of British Columbia Vancouver campus; 2424 Main Mall Vancouver British Columbia Canada
3. Okinawa Institute of Science and Technology; 1919-1 Tancha Onna-son Kunigami Okinawa Japan 904-0412
4. INRA-Nancy; 54280 Champenoux France
5. University of Basel-Botanical Inst; Hebelstrasse 1 CH-4056 Basel Switzerland
6. Ecosystems Research Group, School of Plant Biology M090, University of Western Australia; 35 Stirling Highway Crawley WA 6009 Australia
7. Inst. of Soil Ecology; Helmholtzzentrum München, German Research Ctr. for Environmental Health, Ingolstaedter Landstraße 1; 85764 Neuherberg Germany