1. Soil and Ecosystem Ecology; Lancaster University; Lancaster; LA1 4YQ; UK
2. Department of Biology; Indiana University; Bloomington; IN; USA
3. Department of Terrestrial Ecology; Netherlands, Institute of Ecology (NIOO-KNAW); PO Box 50; 6700 AB; Wageningen; The Netherlands
4. 322 Leidy Laboratories; Department of Biology; University of Pennsylvania; Philadelphia; PA; 19104; USA
5. Department of Biology; Stanford University; 371 Serra Mall; Stanford; CA; 94305-5020; USA
6. Department of Forest Ecology and Management; Swedish University of Agricultural Sciences; S-901 83; Umeå; Sweden
7. Okanagan, Biology and Physical Geography Unit; University of British Columbia; Kelowna; BC; Canada
8. Plants, Soils and Climate; Utah State University; 4820 Old Main Hill; Logan; UT; 84322-4820; USA
9. Department of Ecology and Evolutionary Biology; University of Tennessee; 569 Dabney Hall; Knoxville; TN; 37996; USA
10. Department of Environmental Science, Policy & Management; University of California Berkeley; 130 Mulford Hall #3144; Berkeley; CA; 94720; USA