Associate Professor of Biology

• Ph.D., Botany, University of California, Davis. June 1992. Dissertation: The physiological benefit of leaf flutter in poplars. Advisor: Robert W. Pearcy.
• Master of Science, Botany, University of California, Davis. March 1989.
• Bachelor of Science, Forest Management, University of Washington, Seattle, June 1987.

• Associate Professor, Southern Oregon University, 9/02 – present
• Assistant Professor, Southern Oregon University, 9/16/99 – 9/02
• Research Assistant Professor, University of Utah, 7/1/98 – 9/16/99
• Research Associate, University of Utah, mentor, Jim Ehleringer,12/95 - 7/1/98
• Post-doctoral Fellow, Research School of Biological Sciences, Australian National University, mentor, Marilyn Ball, 10/93 - 12/95.
• Visiting Fellow, Research School of Biological Sciences, Australian National University, 10/92 - 10/93.
• Graduate study, University of California, Davis, Graduate advisor Robert W. Pearcy, 9/87 - 9/92
• Research Assistant, University of Washington, employer Liz Van Volkenburgh, 6/86 - 9/87.
• Research technician, Weyerhaeuser Company, 6/80 - 12/84.

Courses Taught at SOU

• Plant Physiology, Bi 331, Bi 331L Web site for NSF funded project for improving bioenergetics education
• Principles of Biology, Bi 211, 211L, 212L, 213L
• General Biology, Bi 103, Bi 101L, 102L, 103L
• Physiological Plant Ecology, Bi 431, Bi 431L
• Conservation of Natural Resources, Bi 445/545
• Natural Resource Management, Bi 590
• Plant Anatomy, Bi 434/534, Bi 434L/534L

• Stable Isotope Ecology (BIO 6473), University of Utah (2001, 2002)
• Plant Ecology (BIO 5460), University of Utah
• Topics in Physiological Ecology (BIO 621). University of Utah
• Ecological Systems Course, Australian National University
• Plant Ecophysiology, Plant Physiology, General Botany, UC Davis (TA)

Most recent

• Ehleringer JR, JS Roden and TE Dawson. (2000) Assessing ecosystem-level water relations through stable isotope ratio analyses. In, Sala OE, RB Jackson, HA Mooney and RW Howarth (eds), Methods in Ecosystem Science, Springer-Verlag, Heidelberg, pp.181-198.
• Roden JS, G Lin and JR Ehleringer (2000) A mechanistic model for the interpretation of hydrogen and oxygen isotope ratios in tree-ring cellulose. Geochimica et Cosmochimica Acta 64:21-35.
• Roden JS and JR Ehleringer. (2000) Hydrogen and oxygen isotope ratios of leaf water and tree-ring cellulose for field grown riparian trees. Oecologia 123:481-489.
• Roden JS and JR Ehleringer (2000) Biochemical fractionation of hydrogen and oxygen isotopes in tree-ring cellulose is not temperature dependent. Isotopes in Environmental and Health Studies 36:303-317.
• Roden JS, G Lin and JR Ehleringer (2002) Response to the comment of V.J. Terwilliger on "A mechanistic model for the interpretation of hydrogen and oxygen isotope ratios in tree-ring cellulose," by J.S. Roden, G. Lin, and J.R.Ehleringer 2000 Geochimica et Cosmochimica Acta 64:21-35. Geochimica et Cosmochimica Acta 66:733-734.
• Helliker BR, JS Roden, C Cook and JR Ehleringer (2002) A rapid and precise method for sampling and determining the oxygen isotope ratio of atmospheric vapor. Rapid Communication in Mass Spectromotry 16:929-632.
• Roden JS. (2003) Modeling the light interception and carbon gain of individual fluttering aspen (Populus tremuloides) leaves. Trees 17:117-126.
• Barbour MM, JS Roden, GD Farquhar and JR Ehleringer (2004) Expressing leaf water and cellulose oxygen isotope ratios as enrichment above source water reveals evidence of a Péclet effect. Oecologia 138:426-435.
• Roden JS, DR Bowling, NG McDowell, BJ Bond and JR Ehleringer. Carbon and oxygen isotope content of tree ring cellulose along a precipitation transect in Oregon, USA. Journal of Geophysical Research - Biogeosciences (in press).
• Gaudinski, JB, TE Dawson, S. Quideau, EAG Schuur, JS Roden, SE Trumbore, DR Sandquist, S-W Oh and RE Wasylishen. A comparative analysis of cellulose preparation techniques for use with 13C, 14C and 18O isotopic measurements. Analytical Chemistry (in press).
  Other publications
  Abstracts and Presentations

My fundamental interests are in Plant Physiological Ecology with special reference to trees and forest ecosystems. The theme that binds my interests together is an interest in how the microenvironment of a plant influences its form and function. In particular, I have been interested in how plants acclimate and adapt to environmental heterogeneity with an emphasis on how those physiological and morphological characteristics affect survival and growth.

NSF funded project in the Course Curricula and Laboratory Imporvement program (CCLI). Enhancing bioenergetics curricula at Southern Oregon University Web site.

• Stable isotopes in tree ring cellulose as indicators of plant water use and climate change                                        (click here for more information)

• The effects of wind and leaf movements (leaf flutter) on canopy light dynamics and its impact on photosynthesis       (click here for more information)

• The effects of elevated CO₂ and temperature extreme events (global change) on tree seedling physiology.            (click here for more information)

• The genotype/phenotype interactions of conifers in common garden experiments.                                                   (click here for more information)

• American Society of Plant Physiologists
• Ecological Society of America
• Sigma Xi, The Scientific Research Society
• Amercian Geophysical Union
• The American Scientific Affiliation

 

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