Gray, Andrew

Position Type: 
Job Title: 
Courtesy Faculty; Research Ecologist, USDA Forest Service
Forest Ecosystems & Society
Office Location: 

256 FSL

Phone Number: 
(541) 750-7252
Fax Number: 
(541) 758-7760
B.S., 1985, University of Washington, Seattle
M.S., 1990, University of Washington, Seattle
Ph.D., 1995, Oregon State University, Corvallis
Research Areas: 
  • Forest, Wildlife, and Landscape Ecology
  • Science of Conservation, Restoration, and Sustainable Management
Research Interests: 
  • Forest Ecology
Plant population ecology; forest succession; fire ecology; understory plant relationships; landscape ecology; adaptive management. Available to co-advise with a second Major Professor


Graduate Major Advisor
Selected Publications: 
  1. Whittier, T.R., and A.N. Gray. 2016. A tree mortality based fire severity classification for forest inventory surveys: a Pacific Northwest national forests example. Forest Ecology and Management 359: 199-209.

  2. Temesgen, H., D. Affleck, K. Poudel, A. N. Gray, and J. Sessions. 2015. A review of the challenges and opportunities in estimating above ground forest biomass using tree-level models. Scandinavian Journal of Forest Research. 30:326-335.

  3. Turner, D. P., W. D. Ritts, R. E. Kennedy, A. N. Gray, and Z. Yang. 2015. Effects of Harvest, Fire, and Pest/Pathogen Disturbances on the West Cascades Ecoregion Carbon Balance. Carbon Balance and Management 10:12.

  4. Gray, A. N., T. R. Whittier, and D. L. Azuma. 2014. Estimation of Above-Ground Forest Carbon Flux in Oregon: Adding Components of Change to Stock-Difference Assessments. Forest Science 60:317-326.

  5. Gray, A. N. and T. R. Whittier. 2014. Carbon stocks and changes on Pacific Northwest national forests and the role of disturbance, management, and growth. Forest Ecology and Management 328:167-178.

  6. Lintz, H.E., A.N. Gray, and B. McCune. 2013. Effect of inventory method on niche models: Random versus systematic error. Ecological Informatics 18: 20-34.

  7. Schulz, B.K., and A.N. Gray. 2013. The new flora of northeastern USA: quantifying introduced plant species occupancy in forest ecosystems. Environmental Monitoring and Assessment 185, 3931-3957.

  8. Gray, A.N., T.A. Spies, and R.J. Pabst. 2012. Canopy gaps affect long-term patterns of tree growth and mortality in mature and old-growth forests in the Pacific Northwest. Forest Ecology and Management 281: 111-120.

  9. McIntosh, A., A. Gray, and S. Garman. 2012. Estimating canopy cover from standard forest inventory measurements in western Oregon. Forest Science 58:154-167.

  10. Gray, A., V. Monleon, and T. Spies. 2009. Characteristics of remnant old growth forests in the northern Coast Range of Oregon and comparison to surrounding landscapes. General Technical Report PNW-GTR-790. Portland, OR: USDA Forest Service, Pacific Northwest Research Station.

  11. Gray, A.N. 2008. Monitoring and assessment of regional impacts from exotic invasive plants in forests of the Pacific coast, USA. Pp 217-235 In Kohli, Ravinder K., Shibu Jose, Harminder P. Singh, and Daizy R. Batish (eds). Invasive Plants and Forest Ecosystems. CRC Press, Boca Raton, Fl.

  12. Zald, H.S.J., A.N. Gray, M. North, and R.A. Kern. 2008. Initial tree regeneration responses to fire and thinning treatments in a Sierra Nevada mixed-conifer forest, USA. Forest Ecology and Management 256: 168-179.

  13. Fiala, A., S. Garman, and A. Gray. 2006. Comparison of five canopy-cover estimation techniques in the western Oregon Cascades. Forest Ecology and Management 232: 188-197.

  14. Gray, A. 2005. Eight nonnative plants in western Oregon forests: associations with environment and management. Environmental Monitoring and Assessment 100: 109–127.

  15. Gray, A.N., H.S.J. Zald, R.A. Kern, and M. North. 2005. Stand conditions associated with tree regeneration in Sierran mixed-conifer forests. Forest Science 51(3): 198-210.

  16. Gray, A.N. 2003. Monitoring stand structure in mature coastal Douglas-fir forests: effect of plot size. Forest Ecology and Management 175: 1-16.

  17. Gray, A.N., T.A. Spies, and M.J. Easter. 2002. Microclimatic and soil moisture responses to gap formation in coniferous forests. Canadian Journal of Forest Research 32: 332-343.