Scientists & Staff
- Ph.D. Wildland Resource Science (forest management), University
of California-Berkeley, 1996
- M.S. Land Resources, University of Wisconsin-Madison,
- B.S. Computer Science, University of Wisconsin-Madison, 1987
My current research interest is how forests in Alaska are changing over
time, particularly with respect to climate and disturbance. Aspects of
this topic that I’m working on this year are:
- Change in biomass
and carbon mass for different tree species and ecoregions in forests
in southeast and south-central Alaska
- Mapping and predicting change
in potential forest productivity in the temperate rain forest of
Alaska (a project in cooperation with
- Understanding how climate affects distribution
and abundance of hemlock dwarf mistletoe and its host, western hemlock,
distributions for both populations under varying climate scenarios
monitoring techniques for northern latitudes, with particular focus
on how remote sensing data and field information
can be efficiently
combined to track possible climate-related changes in boreal
Why This Research is Important
Mean annual temperatures have increased across Alaska in the past 60
years, and substantial further changes are expected over the next century.
Although some changes are dramatic and easy to detect (melting glaciers,
collapsing permafrost, and the opening of the Arctic Ocean) predicting
how forests will change is complicated by uncertainties in interactions
among climate, competition, insects, and disease. Understanding how and
why forests are shaped by climate, and detecting early changes, is crucial
to making choices that increase the resiliency and sustainability of
Alaska forests and forest-dependent communities.
T.M.; Latta, G.; Hennon, P.E.; Eskelson, B.N.I.; Temesgen, H. [In press.]
Host-parasite distributions under changing climate: Tsuga
heterophylla and Arceuthobium tsugense in Alaska. Canadian Journal
of Forest Research.
Tara M.; Christensen, Glenn A. 2011. Forests
of southeast and south-central Alaska, 2004–2008: five-year forest
inventory and analysis report. Gen. Tech. Rep. PNW-GTR-835. Portland,
OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest
Research Station. 156 p.
T.M.; Gray, A. 2011. Potential of a national monitoring program for forests
to assess change in high latitude ecosystems. Biological
Conservation 144:1285-1294. Doi: 10.1016/j.biocon.2010.10.015.
T.M.; Maltamo, M. 2011. Missing data in forest ecology and management:
advances in quantitative methods (preface). Forest Ecology
and Management. Doi: 10.1016/j.foreco.2011.12.006.
J.M.; Hollingsworth, T.N.; Rupp, T.S., et al. 2011. Evidence and implications
of recent and projected climate change in Alaska’s
forest ecosystems. Ecosphere 2(11):124. Doi: 10.1890/ES11-00288.1.
G.; Temesgen, H; Adams, D.; Barrett, T.M. 2010. Analysis
of potential impacts of climate change on forests of the United States
Forest Ecology and Management. 259(4): 720-729.
B.N.I; Temesgen, H.; Barrett, T. 2009. Estimating cavity tree and
snag abundance using negative binomial regression models and nearest
neighbor imputation methods. Canadian Journal of Forest Research. 39:
T.M.; Andersen, H.E.; Winterberger, K.W. 2009. Integrating
field and LIDAR data to monitor Alaska’s boreal forests. Proceedings
of IUFRO conference extending forest inventory in space and time; May
19-22, 2009; Quebec City, Canada.
B.N.I.; Barrett, T.M.; Temesgen, H. 2009. Imputing mean annual change
to estimate current forest attributes. Silva Fennica. 43(4): 649-658.
B.N.I.; Temesgen, H.; LeMay, V.; Barrett, T.M.; Crookston, N.L.; Hudak,
A.T. 2009. Roles
of nearest neighbor imputation in forest management. Scandinavian Journal of Forest Research. 24: 235-246.
G.; Temesgen, H.; Barrett, T.M. 2009. Mapping
and imputing potential productivity of Pacific Northwest forests using
Canadian Journal of Forest Research. 39: 1197-1207.
B.N.I.; Temesgen, H.; Barrett, T.M. 2009. Estimating
current forest attributes from paneled inventory data using plot-level
a study from the Pacific Northwest. Forest Science. 55: 1:64-71.
J.M.; Morgan, T.A.; Brandt, J.P.; Keegan, C.E.; Dillon, T.; Barrett,
T. 2009. Alaska’s timber harvest and forest products industry,
2005. Gen. Tech. Rep. PNW-GTR-787. Portland, OR: U.S. Department of Agriculture,
Forest Service, Pacific Northwest Research Station.
T.M. 2008. Hardwoods and Sudden oak death. In: Christensen, G.A.; Campbell,
S.J.; Fried, J.S., tech. eds. California’s forest
resources, 2001–2005: five-year Forest Inventory and Analysis report.
Gen. Tech. Rep. PNW-GTR-763. Portland, OR: USDA Forest Service Pacific
Northwest Research Station: 40-45.
T.M.; Waddell, K.L. 2008. Regeneration
of California oak woodlands 2001-2005. In: Merenlender, A.; McCreary,
D.; Purcell, K.L. The proceedings
for the sixth symposium on oak woodlands: today’s challenges, tomorrow’s
opportunities. Gen. Tech. Rep. PSW-GTR-217. Albany, CA: U.S. Department
of Agriculture, Forest Service, Pacific Southwest Research Station: 323-331.
H.; Barrett, T.M.; Latta, G. 2008. Estimating cavity tree abundance in
Pacific Northwest forests (U.S.A.) using nearest neighbor imputation
methods. Silva Fennica. 42(3): 337-354.
B.N.I.; Temesgen, H.; Barrett, T.M. 2008. Comparison of stratified and
non-stratified most similar neighbor imputation for estimating stand
tables. Forestry: An International Journal of Forest Research. 82(2):
T.M.; Zuuring, H.R.; Christopher, T. 2007. Interpretation
of forest characteristics from computer-generated images. Landscape and
Urban Planning. 80(4): 396-403.
T.M. 2006. Optimizing efficiency of height modeling for extensive forest
inventories. Canadian Journal of Forestry Research. 36(9): 2259-2269.
T.M., Gatziolis, D.; Fried, J.S.; Waddell, K.L. 2006. Sudden
oak death in California: What is the potential? Journal of Forestry.
T.M. 2006. Pre-epidemic
mortality rates for common Phytophthora ramorum host tree species in
California. In: Frankel, S.J.; Shea, P.J.;
Haverty, M.I., tech. cords. Proceedings of the sudden oak death second
science symposium: the state of our knowledge. Gen. Tech. Rep. PSW-GTR-196.
Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest
Research Station: 371-378.
M.; Barrett, T.M., tech. comps. 2005. Systems
analysis in forest resources: proceedings of the 2003 symposium. Gen. Tech. Rep. PNW-GTR-656.
Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific
Northwest Research Station. 366 p.
K.L.; Barrett, T.M. 2005. Oak
woodlands and other hardwood forests of California, 1990s. Resour. Bull. PNW-RB-245. Portland, OR: U.S. Department
of Agriculture, Forest Service, Pacific Northwest Research Station. 94
T.M. 2004. Estimation
procedures for the combined 1990s periodic forest inventories of California,
Oregon, and Washington. Gen. Tech.
Rep. PNW-GTR-597. Portland, OR: U.S. Department of Agriculture, Forest
Service, Pacific Northwest Research Station.
T.M.; Fried, J.S. 2004. Inventory: modeling. In: Burley, J; Evans, J.,
J.A., eds. Encyclopedia of forest science.
Oxford: Elsevier Science, Academic Press: 425-433.
G.J.; Barrett, T.A., eds. 2003. Systems analysis in forest resources:
proceedings of the 8th symposium. Boston: Kluwer Academic Publishers.
T.M.; Schurr, F.G.; O’Hara, K.L. 2002. Classifying stand
structure: a comparison of SVS images with plot visits and FVS-generated
metrics. In: Crookston, N.L.; R.N. Havis, comps. Second
Forest Vegetation Simulator (FVS) conference. Proceedings RMRS-P-25. Ogden, UT: U.S. Department
of Agricluture, Forest Service, Rocky Mountain Research Station: 31-37.
T.M. 2001. Models
of vegetation change for landscape planning: a comparison of FETM, LANDSUM,
SIMPPLLE, and VDDT. Gen. Tech. Rep. RMRS-GTR-76.
Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky
Mountain Research Station. 14 p.
T.M.; J.G. Jones; Wakimoto, R.H. 2000. Forest Service spatial information
use for planning prescribed
fires. Western Journal of Applied
Forestry. 15(4): 200-207.
T.M.; Gilless, J.K. 2000. Even-aged
restrictions with sub-graph adjacency.
Annals of Operations Research.
R.C.; Barrett, T.M. 1999. Effects of planting density on early growth
of giant sequoia. Western Journal of Applied Forestry. 14(2):
T.M.; Gilless, J.K.; Davis, L.S. 1998. Economic
and fragmentation effects of clearcut restrictions. Forest Science. 44(4): 569-577.
Barrett, T.M. 1997. Voronoi tessellation methods to delineate harvest
units for spatial forest planning. Canadian Journal of Forest Research.
T.M.; Davis, L.S. 1996. Predicting the spatial effects of forest management
alternatives over multiple time periods. In: Heit, M.; Parker,
H.D.; Shortreid, A., eds. GIS applications in natural resources 2.
Fort Collins: GIS World, Inc.: 473-476.