Aquatic and Riparian Ecosystems

Rob Hubbard

Career Biography | Research Interests | Significant Publications | Professional Organizations | Contact Information

Career Biography

Professional Experience

Education

Research Interests

My primary research interests focus on plant water relations and the role plants play in regulating hydrologic processes. I am particularly interested in how changes in stand age and species composition affect stream flow at watershed scales. Other research and interests focus on the controls and mechanisms of stomatal behavior, environmental and physiological limits to plant water use, understanding the role of hydraulic constraints in determining tree and forest productivity, and understanding how changes in nutrition affects stand level transpiration.

Publications

Ford C.R., Hubbard R.M., Kloeppel B.D. & Vose J.M. A comparison of sap flux-based evapotranspiration estimates with catchment-scale water balance. 2007 Agricultural and Forest Meteorology, (In Press)

Hubbard, R.M. , M.G. Ryan, K. Elder, Rhoades, C.C. 2005. Seasonal patterns in soil surface CO2 flux under snow cover in 50 and 300 year old subalpine forests. Biogeochemistry 73: 93-107.

Hubbard, R.M., M.G. Ryan, C.P. Giardina and H.R. Barnard. 2004. The effect of fertilization on sap flux and canopy conductance in a Eucalyptus saligna experimental forest. Global Change Biology (in press).

Hubbard, R.M., B.D. Clinton, J.M. Vose, K.J. Elliot and J.D. Knoepp. 2003. Stand restoration burning in Oak-Pine forest in the Southern Appalachians. Effects on aboveground biomass and carbon and nutrient cycling. Forest Ecology and Management (in press).

Hubbard, R. M., B. J. Bond, R. Senock and M.G. Ryan. 2002. Effects of branch height on leaf gas exchange, branch hydraulic conductance and branch sap flux in open-grown ponderosa pine. Tree Physiology 22: 575-581.

McDowell N., Barnard H., Bond B.J., Hinckley T., Hubbard R.M., Ishii H., Köstner B., Magnani F., Marshall J.D., Meinzer F.C., Phillips N., Ryan M.G. & Whitehead D. 2002 The relationship between tree height and leaf area: sapwood area ratio. Oecologia, 132, 12-20.

Hubbard, R. M., V. Stiller, M.G. Ryan and J.S. Sperry. 2001. Stomatal conductance and photosynthesis vary linearly with plant hydraulic conductance in ponderosa pine. Plant, Cell and Environment 24: 113-121.

Giardina C.P., Ryan M.G., Hubbard R.M. & Binkley D. (2001) Tree species and soil textural controls on carbon and nitrogen mineralization rates. Soil Science Society of America Journal, 65, 1272-1279.

Ryan M.G., Bond B.J., Law B.E., Hubbard R.M., Woodruff D., Cienciala E. & Kucera J. (2000) Transpiration and whole-tree conductance in ponderosa pine trees of different heights. Oecologia, 124, 553-560.

Hubbard, R.M., B.J. Bond and M.G. Ryan. 1999. Evidence that hydraulic conductance limits photosynthesis in old ponderosa pine trees. Tree Physiology (19) 165-172.

Ryan M.G., Hubbard R.M., Pongracic S., Raison R.J. & McMurtrie R.E. 1996 Foliage, fine-root, woody-tissue and stand respiration in Pinus radiata in relation to nitrogen status. Tree Physiology, 16, 333-343

Hubbard R.M., Ryan M.G. & Lukens D.L. 1995 A Simple, Battery-Operated, Temperature-Controlled Cuvette for Respiration Measurements. Tree Physiology, 15, 175-179.

Ryan M.G., Gower S.T., Hubbard R.M., Waring R.H., Gholz H.L., Cropper W.P. & Running S.W. 1995 Woody tissue maintenance respiration of four conifers in contrasting climates. Oecologia, 101, 133-140.

Ryan M.G., Hubbard R.M., Clark D.A. & Sanford R.L. (1994) Woody-tissue respiration for Simarouba amara and Minquartia guianensis, two tropical wet forest trees with different growth habits. Oecologia, 100, 213-220

Professional Organizations

Ecological Society of America

Society of American Foresters

Phi Beta Kappa

Contact Information

Rob Hubbard

Ecologist

USDA Forest Service

Rocky Mountain Research Station

240 West Prospect Rd.

Fort Collins, CO 80526

Phone: (970) 498-1260

Fax: (970) 498-1010

Email: rhubbard@fs.fed.us

USDA Forest Service - RMRS - RWU4352
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