1. Department of Civil and Environmental Engineering; University of Waterloo; Waterloo ON N2L 3G1 Canada
2. Department of Geography and Environmental Management; University of Waterloo; Waterloo ON N2L 3G1 Canada
3. Department of Renewable Resources; University of Alberta; Edmonton AB T6G 2H1 Canada
4. Sustainable Soils and Grassland Systems Department; Rothamsted Research; North Wyke Okehampton EX20 2SB UK
5. Department of Forest Engineering, Resources and Management; Oregon State University; Corvallis OR 97331 USA