1. Nicholas School of the Environment and Earth Sciences; Duke University; Durham North Carolina 27708 USA
2. Department of Forest Ecology and Management; Swedish University of Agricultural Sciences (SLU); Umeå SE-901 83 Sweden
3. Department of Environmental Science; Faculty of Science; Chulalongkorn University; Bangkok 10330 Thailand
4. Hydrospheric-Atmospheric Research Center; Nagoya University; Chikusa-ku Nagoya 464-8601 Japan
5. USDA Forest Service Coweeta Hydrologic Laboratory; 3160 Coweeta Lab Road Otto North Carolina 28763 USA
6. School of Public Affairs; Arizona State University; Phoenix Arizona 85004 USA
7. Southern Swedish Forest Research Centre; SLU; P.O. Box 49 Alnarp SE-230 53 Sweden
8. UMR 1391 ISPA INRA; Bordeaux Sciences AGRO; 1 Cours du général de Gaulle Gradignan Cedex 33175 France