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| Research Interests: |
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Ecophysiology and stress physiology of trees and other plants
Use of stable isotopes in plant physiology and ecology
Phenotypic plasticity and resource allocation
Photosynthesis
Respiration (particularly alternative path respiration)
Water relations
Forest regeneration and stock quality |
| Current Research: |
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Comparative physiology of plant adaptation: C and N isotope discrimination and trade-offs in traits related to resource acquisition in black cottonwood – NSERC |
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 Graduate students
| Dheeraj Chillakuru, Supervisor - Chair - Academic and Research , M.Sc. started Wednesday, September 01, 2004 |
| Lee Kalcsits, Supervisor - Chair - Academic and Research , Ph.D. started Monday, September 01, 2008 |
| Raju Soolanayakanahally, Supervisor - Chair - Academic and Research , Ph.D. started Wednesday, September 01, 2004 |
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| Awards: |
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2005 UBC Killam Teaching Prize |
| Courses Taught: |
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FRST 200 Forest Plant Biology I
FRST 210 Forest Plant Biology II
FRST 516 Tree Physiology |
| Links: |
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TREES Structure and Function
Canadian Society of Plant Physiologists
Fluxnet Canada |
| Additional
Info: |
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 Current publications
| Kranabetter JM, Simard SW, Coates KD, Guy R. (2009) Species patterns in foliar nitrogen concentration, nitrogen content and 13C abundance for understory saplings across light gradients Plant and Soil, in press. |
| Teste FP, Simard SW, Durall DM, Guy R, Berch SM (2009) Net carbon transfer occurs under soil disturbance between
Pseudotsuga menziesii var. glauca seedlings in the field Journal of Ecology, in press |
| Teste FP, Simard SW, Durall DM, Guy RD, Jones MD, Schoonmaker AL (2009) Access to mycorrhizal networks and tree roots: importance for seedling survival & resource transfer Ecology, 90: 2808-2822. |
| Coleman, H.D., Samuels, A.L., Guy, R. Mansfield, S.D. (2008) Perturbed lignification impacts tree growth in hybrid poplar - a function of sink strength, vascular integrity and photosynthetic assimilation. Plant Physiology. 148:1229-1237. |
| Hilker, T., N.C. Coops, M.A. Wulder, T.A. Black, and R.D. Guy. (2008) The use of remote sensing in light use efficiency based models of gross primary production: A review of current status and future requirements Science of the Total Environment. 404, 411-423 |
| Jemma L Gornall and Robert D Guy (2007) Geographic variation in ecophysiological traits of black cottonwood (Populus trichocarpa) Can. J. Bot. 85: 1202-1213 |
| Pharis R.P., Russell, J. H., Guy, R. D., Mansfield, S. D., Zhang, R. and Kurepin, L.V. (2007) Enhanced flowering & early progeny testing – Two important tools in tree improvement -A New Era for the Conservation and Utilization of Forest Genetic Resources. Forest Seed Research Ctr, Suanbo, Korea Forest Research Institute, Suwon, Korea. pp 114-140. |
| Schoonmaker, A.L., Teste, F.P., Simard, S.W., Guy, R.D. (2007) Tree proximity, soil pathways and common mycorrhizal networks: their influence on utilization of redistributed water by understory seedlings Oecologia, 154: 455-466. |
| Pharis, R.P., Guy, R.D., Mansfield, S. D., Zhang, R., Kurepin, l. V., Fung, L. and Hurst, S. (2006) Retrospective tests – Methods for identifying "inherently" rapid stem gowth capacity for poplar and other forest tree plantations -Proceedings Paper In: Proceedings of the 50th Anniversary of Korea Forest Genetics Researches, pp 93-108. Korea Forest Research Institute, Suwon, Korea, 168 pp. |
| Pritchard, E.S., and R.D. Guy (2005) Nitrogen isotope discrimination in white spruce fed with low concentrations of ammonium and nitrate. Trees 19:89-98 |
| Guy, R.D., and G.C. Vanlerberghe (2005) Partitioning of respiratory electrons in the dark in leaves of transgenic tobacco with modified levels of alternative oxidase Physiol Plant 125:171-180 |
| Baleshta, K.E., S.W. Simard, R.D. Guy and C.E. Chanway (2005) Reducing paper birch density increases Douglas-fir growth and Armillaria root disease incidence in southern interior British Columbia Forest Ecology and Management, 208: 1-13. |
| Yu, F-Y, and RD Guy. (2004) Variable chlorophyll fluorescence in response to water plus heat stress treatments in three coniferous tree seedlings. J For Res 15:24-28 |
| Yu, F-Y, X-Z Xu, and RD Guy. (2004) Effects of water plus heat stress on gas exchange and water use efficiency in four species of coniferous seedlings. Scientia Silvae Sinicae 40:38-44 |
| Yu, F-Y, X-Z Xu, and RD Guy. (2004) Effects of water and heat stress on the needle sugar content of four coniferous tree seedlings. J Nanjing Forestry University (Natural Sciences Edition) 28:1-5 |
| Yu, F-Y, X-Z Xu, and RD Guy. (2003) Effects of water and heat stress on the seedling height growth and biomass of five trees. J Nanjing Forestry University (Natural Sciences Edition) 27:10-14 |
| Guy, R.D., and J. Krakowski (2003) Fall colours – Nature’s canvas is a silk parasol Davidsonia 14:111-120 |
| Hoberg, G., R. Guy, S. Hinch, R.A. Kozak, P. McFarlane and S.B. Watts (2003) Image and Enrolments. Forum 10(6):22-23. |
| Guy, R.D. and D.L. Holowachuk. (2001) Population differences in stable carbon isotope ratio of Pinus contorta Dougl. ex Loud.: Relationship to environment, climate of origin and growth potential. Can. J. Bot. 79:274-283. |
| Silim, S.N., R.D. Guy, T.B. Patterson, and N.J. Livingston. (2001) Plasticity in water-use efficiency of Picea sitchensis, P. glauca and their natural hybrids. Oecologia 128:317-325. |
| Dang, Q.L., T.B. Patterson and R.D. Guy. (2000) Ecophysiological response to interacting effects of drought and nitrogen, and reversibility of drought effect in peatland and upland boreal spruce. -Pp. 187-203 in S.G. Conrad (ed.), Disturbance in Boreal Forest Ecosystems: Human Impacts and Natural Processes. Proc. International Boreal Forest Research Assoc. Ann. Meet., Duluth, MN. USDA Forest Service, General Technical Report NC-209. |
| Min, X., M.Y. Siddiqi, R.D. Guy, A.D.M. Glass, and H.J. Kronzucker. (2000) A comparative kinetic analysis of nitrate and ammonium influx in two early successional tree species of temperate and boreal forest ecosystems. Plant Cell Environ. 23:321-328. |
| Benowicz, A., R.D. Guy and Y.A. El-Kassaby. (2000) Geographic pattern of genetic variation in photosynthetic capacity and growth in two hardwood species from British Columbia. Oecologia 123:168-174. |
| Livingston, N.J., R.D. Guy, Z.J. Sun, and G.J. Ethier. (1999) The effects of nitrogen stress on the stable carbon isotope composition, productivity and water use efficiency of white spruce (Picea glauca (Moench) Voss) seedlings. Plant Cell Environ. 22:281-289. |
| Min, X., M.Y. Siddiqi, R.D. Guy, A.D.M. Glass, and H.J. Kronzucker. (1999) A comparative study of fluxes and compartmentation of nitrate and ammonium in early successional tree species. Plant Cell Environ. 22:821-830. |
| Fielding, A.S., D.H. Turpin, R.D. Guy, S.E. Calvert, D. Crawford and P.J. Harrison. (1998) Influence of the carbon concentrating mechanism on carbon stable isotope fractionation by the marine diatom Thalassiosira pseudonana. Can. J. Bot. 76:1098-1103. |
| Min, X., M.Y. Siddiqi, R.D. Guy, A.D.M. Glass and H.J. Kronzucker. (1998) Induction of nitrate uptake and nitrate reductase activity in trembling aspen and lodgepole pine. Plant Cell Environ. 21:1039-1046. |
| Silim, S.N., and R.D. Guy. (1998) Influence of thawing duration on performance of conifer seedlings. Pp. 155-162 in Kooistra, C.M. (ed.), Proceedings of the 1995, 1996, and 1997 Annual Meetings of the Forest Nursery Association of British Columbia. FNABC, Vernon, B.C. |
| Patterson, T.B., R.D. Guy and Q.L. Dang. (1997) Whole-plant nitrogen- and water-relations traits, and their associated trade-offs, in adjacent muskeg and upland boreal spruce species. Oecologia 110:160-168. |
| Ribas-Carbo, M., L. Giles, R.D. Guy, S.A. Robinson, J.N. Siedow and J.A. Berry. (1997) O2 isotope fractionation technique for studies on plant mitochondrial respiration. Mini-review. International Cyber Conference on Analytical BioSciences, Hiroshima, Japan. Trends in Analytical Life Sciences vol.1 issue No. 24 (electronic publication) |
| Brown, K.R., W.A. Thompson, E.L. Camm, B.J. Hawkins and R.D. Guy. (1996) Effects of N addition rates on the productivity of Picea sitchensis, Thuja plicata, and Tsuga heterophylla seedlings. II. Photosynthesis, 13C discrimination and N partitioning in foliage. Trees 10:198-205. |
| Sun, Z.J., N.J. Livingston, R.D. Guy and G.J. Ethier. (1996) Stable carbon isotopes as indicators of increased water use efficiency and productivity in white spruce (Picea glauca (Moench) Voss) seedlings. Plant Cell Environ. 19:887-894. |
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 Unit
Associations
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 Professional
Affiliations
| American Society of Plant Biologists ASPB |
| Canadian Botanical Association CBA |
| Canadian Society of Plant Physiologists CSPP |
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Robert D Guy
Plant Physiology
B.Sc. (1977), Ph.D. (1984) Calgary
| | Department of Forest Sciences
Faculty of Forestry
The University of British Columbia
3rd Floor, Forest Sciences Centre
#3041 - 2424 Main Mall
Vancouver, British Columbia
Canada V6T 1Z4
Phone: (604) 822-6023
Fax: (604) 822-9102
Email:  |
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