INSTAAR: Holly R. Barnard

Research Scientist of INSTAAR; Assistant Professor of Geography, Univ. of Colorado at Boulder.

PhD: 2009, Oregon State University.

Holly.Barnard@colorado.edu
(phone being assigned)

Specialty: Ecohydrology, stable isotope geochemistry, forest hydrology, tree physiology.

Research Interests: My research is focused on investigating how vegetation processes affect water flow dynamics and pathways in soil and streams, and conversely, how water flow paths affect vegetation function in mountainous terrain. The ultimate goal is to improve our knowledge of how changes in land-use and/or climate will affect water resources and ecosystems. This interdisciplinary research uses state-of-the-art techniques to reveal patterns and processes at scales ranging from the leaf to the watershed. Some current topics include: evapo-transpiration partitioning using stable isotopes; impact of bark beetle outbreaks on forest water yield in southern Wyoming; and examining the influence of micro-climate on tree function using stable isotope analysis of tree rings.

Outstanding Awards: National Science Foundation Post-doctoral Fellow (2009-2010), American Geophysical Union Horton Research Grant (2007), Ford Foundation Pre-doctoral Fellow (2005-2008).

Selected Publications:

Brooks, J.R., H.R. Barnard, R. Coulombe, and J. McDonnell. 2010. Ecohydrologic separation of water between trees and streams in a Mediterranean climate. Nature Geoscience, In Press, doi:10.1038/NGEO722.
Barnard, H.R., C.B. Graham, W.J. Van Verseveld, J.R. Brooks, B.J. Bond, and J.J. McDonnell. 2010. Mechanistic assessment of hillslope transpiration controls of diel sub-surface flow: a steady-state irrigation approach. Ecohydrology, In Press.
Pypker, T.G., H.R. Barnard, M. Hauck, E.W. Sulzman, M.H. Unsworth, A.C. Mix, A. Kennedy, and B.J. Bond. 2009. Can carbon isotopes be used to predict watershed scale transpiration? Water Resource Research 45, W00D35, doi:10.1029/2008WR007050.
Pypker, T.G., M. Hauck, E.W. Sulzman, M.H. Unsworth, A.C. Mix, Z. Kayler, D. Conklin, A. Kennedy, H.R. Barnard and B.J. Bond. 2008. Toward using δ13C of ecosystem respiration to monitor canopy physiology in complex terrain. Oecologia, 158, 399-410.
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 10:427-436.
Barnard, H.R. and M.G. Ryan. 2003. A test of the hydraulic limitation hypothesis in fast-growing Eucalyptus saligna, Plant, Cell and Environment, 26, 1235-1245.
McDowell, N., H.R. Barnard, B.J. Bond, T. Hinckley, R. Hubbard, H. Ishii, B. Kostner, F.C. Meinzer, J.D. Marshall, F. Magnani, N. Phillips, M.G. Ryan, and D. Whitehead. 2002. The relationship between tree height and leaf area:sapwood area ratio. Oecologia, 132 (1): 12-20.
Binkley, D., J.L. Stape, M.G. Ryan, H.R. Barnard, and J. Fownes. 2001. Age-related decline in forest ecosystem growth: an individual-tree, stand structure hypothesis. Ecosystems 5 (1): 58-67.

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