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Aquatic and Riparian Ecosystems
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.
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, 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.
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
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
Ecological Society of America
Society of American Foresters
Phi Beta Kappa
USDA Forest Service
Rocky Mountain Research Station
240 West Prospect Rd.
Fort Collins, CO 80526
Phone: (970) 498-1260
Fax: (970) 498-1010
USDA Forest Service - RMRS - RWU4352