Ram Oren

Summary

Affiliation: Duke University Medical Center
Country: USA

Publications

  1. ncbi request reprint Soil fertility limits carbon sequestration by forest ecosystems in a CO2-enriched atmosphere
    R Oren
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina 27708, USA
    Nature 411:469-72. 2001
  2. ncbi request reprint Olevi Kull's lifetime contribution to ecology
    Ram Oren
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708 0328, USA
    Tree Physiol 28:483-90. 2008
  3. doi request reprint The effects of elevated CO2 and nitrogen fertilization on stomatal conductance estimated from 11 years of scaled sap flux measurements at Duke FACE
    Eric J Ward
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    Tree Physiol 33:135-51. 2013
  4. ncbi request reprint Are ecosystem carbon inputs and outputs coupled at short time scales? A case study from adjacent pine and hardwood forests using impulse-response analysis
    Paul C Stoy
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC, USA
    Plant Cell Environ 30:700-10. 2007
  5. doi request reprint Re-assessment of plant carbon dynamics at the Duke free-air CO(2) enrichment site: interactions of atmospheric [CO(2)] with nitrogen and water availability over stand development
    Heather R McCarthy
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    New Phytol 185:514-28. 2010
  6. doi request reprint Hydraulic time constants for transpiration of loblolly pine at a free-air carbon dioxide enrichment site
    Eric J Ward
    Nicholas School of the Environment, Duke University, Durham, NC 27708, USA
    Tree Physiol 33:123-34. 2013
  7. pmc Canopy leaf area constrains [CO2]-induced enhancement of productivity and partitioning among aboveground carbon pools
    Heather R McCarthy
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    Proc Natl Acad Sci U S A 103:19356-61. 2006
  8. doi request reprint Analysis of the sensitivity of absorbed light and incident light profile to various canopy architecture and stand conditions
    Hyun Seok Kim
    Nicholas School of Environmental and Earth Sciences, Duke University, Durham, NC 27708 0328, USA
    Tree Physiol 31:30-47. 2011
  9. pmc Aboveground sink strength in forests controls the allocation of carbon below ground and its [CO2]-induced enhancement
    Sari Palmroth
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    Proc Natl Acad Sci U S A 103:19362-7. 2006
  10. doi request reprint Acclimation of leaf hydraulic conductance and stomatal conductance of Pinus taeda (loblolly pine) to long-term growth in elevated CO(2) (free-air CO(2) enrichment) and N-fertilization
    Jean Christophe Domec
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    Plant Cell Environ 32:1500-12. 2009

Detail Information

Publications31

  1. ncbi request reprint Soil fertility limits carbon sequestration by forest ecosystems in a CO2-enriched atmosphere
    R Oren
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina 27708, USA
    Nature 411:469-72. 2001
    ..Assessment of future carbon sequestration should consider the limitations imposed by soil fertility, as well as interactions with nitrogen deposition...
  2. ncbi request reprint Olevi Kull's lifetime contribution to ecology
    Ram Oren
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708 0328, USA
    Tree Physiol 28:483-90. 2008
    ..We also review some of his findings on the interactive effects of carbon dioxide and ozone on canopy photosynthesis...
  3. doi request reprint The effects of elevated CO2 and nitrogen fertilization on stomatal conductance estimated from 11 years of scaled sap flux measurements at Duke FACE
    Eric J Ward
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    Tree Physiol 33:135-51. 2013
    ..Whether treatment effects on mean leaf-specific G(S) are direct or indirect, this paper highlights that long-term treatment effects on G(S) are generally reflected in A(H) as well...
  4. ncbi request reprint Are ecosystem carbon inputs and outputs coupled at short time scales? A case study from adjacent pine and hardwood forests using impulse-response analysis
    Paul C Stoy
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC, USA
    Plant Cell Environ 30:700-10. 2007
    ..Future efforts to model ecosystem C inputs and outputs in a pulse-response framework must combine measurements of transport in the physical and biological components of terrestrial ecosystems...
  5. doi request reprint Re-assessment of plant carbon dynamics at the Duke free-air CO(2) enrichment site: interactions of atmospheric [CO(2)] with nitrogen and water availability over stand development
    Heather R McCarthy
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    New Phytol 185:514-28. 2010
    ....
  6. doi request reprint Hydraulic time constants for transpiration of loblolly pine at a free-air carbon dioxide enrichment site
    Eric J Ward
    Nicholas School of the Environment, Duke University, Durham, NC 27708, USA
    Tree Physiol 33:123-34. 2013
    ....
  7. pmc Canopy leaf area constrains [CO2]-induced enhancement of productivity and partitioning among aboveground carbon pools
    Heather R McCarthy
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    Proc Natl Acad Sci U S A 103:19356-61. 2006
    ..Further study is necessary to elucidate the mechanisms that control the differential allocation of C among aboveground pools in different forest types...
  8. doi request reprint Analysis of the sensitivity of absorbed light and incident light profile to various canopy architecture and stand conditions
    Hyun Seok Kim
    Nicholas School of Environmental and Earth Sciences, Duke University, Durham, NC 27708 0328, USA
    Tree Physiol 31:30-47. 2011
    ..g., broadleaved). However, even in forests with highly clumped shoots (i.e., coniferous), an accurate estimation of absorbed light distribution in stands requires incorporation of stand density in the model...
  9. pmc Aboveground sink strength in forests controls the allocation of carbon below ground and its [CO2]-induced enhancement
    Sari Palmroth
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    Proc Natl Acad Sci U S A 103:19362-7. 2006
    ....
  10. doi request reprint Acclimation of leaf hydraulic conductance and stomatal conductance of Pinus taeda (loblolly pine) to long-term growth in elevated CO(2) (free-air CO(2) enrichment) and N-fertilization
    Jean Christophe Domec
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    Plant Cell Environ 32:1500-12. 2009
    ....
  11. doi request reprint Differential responses to changes in growth temperature between trees from different functional groups and biomes: a review and synthesis of data
    Danielle A Way
    Department of Biology, Duke University, Durham, NC, USA
    Tree Physiol 30:669-88. 2010
    ..We discuss the implications of these results in the context of a changing climate and highlight the areas of greatest uncertainty regarding temperature and tree growth where future research is needed...
  12. ncbi request reprint Actual and potential transpiration and carbon assimilation in an irrigated poplar plantation
    Hyun Seok Kim
    Nicholas School of Environmental and Earth Sciences, Duke University, Durham, NC 27708 0328, USA
    Tree Physiol 28:559-77. 2008
    ..57 to 1.15 g stem wood C kg(-1) water. Given the economic and social values of water, plantation managers appear to have optimized water use...
  13. pmc A stomatal optimization theory to describe the effects of atmospheric CO2 on leaf photosynthesis and transpiration
    Gabriel Katul
    Nicholas School of the Environment, Box 90328, Duke University, Durham, NC 27708, USA
    Ann Bot 105:431-42. 2010
    ..Here, these responses are investigated using optimality theory applied to stomatal conductance...
  14. doi request reprint Variable conductivity and embolism in roots and branches of four contrasting tree species and their impacts on whole-plant hydraulic performance under future atmospheric CO₂ concentration
    Jean Christophe Domec
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    Tree Physiol 30:1001-15. 2010
    ..The results contributed to our knowledge of the physiological and anatomical mechanisms underpinning the responses of tree species to drought and more generally to global change...
  15. ncbi request reprint Modeling seed dispersal distances: implications for transgenic Pinus taeda
    Claire G Williams
    Duke University, Department of Biology, Durham, North Carolina 27708, USA
    Ecol Appl 16:117-24. 2006
    ..The probability of LDD occurrence of transgenic conifer seeds at distances exceeding 1 km approached 100%...
  16. doi request reprint Leaf stomatal responses to vapour pressure deficit under current and CO(2)-enriched atmosphere explained by the economics of gas exchange
    Gabriel G Katul
    Nicholas School of the Environment, Duke University, Durham, North Carolina, USA
    Plant Cell Environ 32:968-79. 2009
    ..We extended the theory to diagnosing experimental results on the sensitivity of g to D under varying c(a)...
  17. ncbi request reprint Fertilization effects on mean stomatal conductance are mediated through changes in the hydraulic attributes of mature Norway spruce trees
    Eric J Ward
    Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA
    Tree Physiol 28:579-96. 2008
    ..e., an increase in g(s)) after pruning scales inversely with K(l)DeltaPsi, indicating that the higher the potential hydraulic support after pruning, the less complete the stomatal compensation for the increase in A(s):A(l)...
  18. ncbi request reprint Variability in net ecosystem exchange from hourly to inter-annual time scales at adjacent pine and hardwood forests: a wavelet analysis
    Paul C Stoy
    Nicholas School of the Environment and Earth Sciences, Box 90328, Duke University, Durham, NC 27708 0328, USA
    Tree Physiol 25:887-902. 2005
    ..The OWT revealed similarities and differences in the scale-wise control of NEE by vegetation with implications for model simplification and improvement...
  19. ncbi request reprint Estimation of light interception properties of conifer shoots by an improved photographic method and a 3D model of shoot structure
    Mathieu Therezien
    Nicholas School of Environmental and Earth Sciences, Duke University, Durham, NC 27708 0328, USA
    Tree Physiol 27:1375-87. 2007
    ..16 for a wide range of shoot structures. For applications requiring angle-dependent parameterization, our new model facilitates rapid generation of these radiative transfer parameters...
  20. pmc Canopy nitrogen, carbon assimilation, and albedo in temperate and boreal forests: Functional relations and potential climate feedbacks
    S V Ollinger
    Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824, USA
    Proc Natl Acad Sci U S A 105:19336-41. 2008
    ....
  21. ncbi request reprint Carbon dioxide and water vapor exchange in a warm temperate grassland
    K A Novick
    Department of Civil and Environmental Engineering, Duke University, Box 90329, Durham, North Carolina 27708, USA
    Oecologia 138:259-74. 2004
    ..These results, and the results of other studies, suggest that perturbations to the hydrologic cycle are key determinants of C cycling in grassland ecosystems...
  22. ncbi request reprint Mean canopy stomatal conductance responses to water and nutrient availabilities in Picea abies and Pinus taeda
    B E Ewers
    Nicholas School of the Environment, Duke University, Durham, NC 27708, USA
    Tree Physiol 21:841-50. 2001
    ..Despite the large difference in GS both between Picea abies and Pinus taeda and among treatments, stem growth was related to absorbed radiation, and stem growth response to treatment reflected mostly the changes in L...
  23. ncbi request reprint Stomatal sensitivity to vapor pressure deficit and its relationship to hydraulic conductance in Pinus palustris
    Robert N Addington
    Department of Plant Biology, University of Georgia, Athens, GA 30602, USA
    Tree Physiol 24:561-9. 2004
    ..Our results are consistent with the hypothesis that stomatal response to D occurs to regulate minimum leaf water potential, and that the sensitivity of this response is related to changes in whole-plant hydraulics...
  24. ncbi request reprint Time series diagnosis of tree hydraulic characteristics
    Nathan G Phillips
    Boston University, Geography Department, 675 Commonwealth Avenue, Boston, MA 02215, USA
    Tree Physiol 24:879-90. 2004
    ....
  25. ncbi request reprint Temporal variability in (13)C of respired CO(2) in a pine and a hardwood forest subject to similar climatic conditions
    Behzad Mortazavi
    Department of Oceanography, Florida State University, Tallahassee, FL 32306 4320, USA
    Oecologia 142:57-69. 2005
    ....
  26. pmc Forest response to elevated CO2 is conserved across a broad range of productivity
    Richard J Norby
    Environmental Sciences Division, Oak Ridge National Laboratory, TN 37831 6422, USA
    Proc Natl Acad Sci U S A 102:18052-6. 2005
    ....
  27. ncbi request reprint Progressive nitrogen limitation of ecosystem processes under elevated CO2 in a warm-temperate forest
    Adrien C Finzi
    Department of Biology, Boston University, Massachusetts 02215, USA
    Ecology 87:15-25. 2006
    ..widening C-to-N ratios and ecosystem-N accrual as processes that drive and delay PNL, respectively. Only direct observations through time will definitively answer this question...
  28. ncbi request reprint The likely impact of elevated [CO2], nitrogen deposition, increased temperature and management on carbon sequestration in temperate and boreal forest ecosystems: a literature review
    Riitta Hyvönen
    Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences SLU, PO Box 7072, SE 750 07 Uppsala, Sweden
    New Phytol 173:463-80. 2007
    ..However, management has considerable potential for controlling the C store...
  29. ncbi request reprint Mechanisms of long-distance dispersal of seeds by wind
    Ran Nathan
    Department of Life Sciences, Ben Gurion University of the Negev, Beer Sheva 84105, Israel
    Nature 418:409-13. 2002
    ..Because uplifting probabilities are appreciable (as much as 1 5%), and tree seed crops are commonly massive, some LDD events will establish individuals that can critically affect plant dynamics on large scales...
  30. pmc Increases in nitrogen uptake rather than nitrogen-use efficiency support higher rates of temperate forest productivity under elevated CO2
    Adrien C Finzi
    Department of Biology, Boston University, Boston, MA 02215, USA
    Proc Natl Acad Sci U S A 104:14014-9. 2007
    ..Biogeochemical models must be reformulated to allow C transfers below ground that result in additional N uptake under elevated CO(2)...
  31. doi request reprint Irreconcilable differences: fine-root life spans and soil carbon persistence
    Allan E Strand
    Department of Biology, College of Charleston, Charleston, SC 29424, USA
    Science 319:456-8. 2008
    ..On the other hand, isotopic techniques systematically underestimate the turnover of individual roots. These differences, by virtue of the separate processes or pools measured, are irreconcilable...