Helge Ro-Poulsen

Helge Ro-Poulsen

Emeritus

Member of:

    ORCID: 0000-0002-6531-118X

    Publication year:
    All
    1 - 82 out of 82Page size: 500
    1. 2017
    2. Published

      Warming, shading and a moth outbreak reduce tundra carbon sink strength dramatically by changing plant cover and soil microbial activity

      Dahl, M. B., Priemé, Anders, Brejnrod, A. D., Brusvang, P., Lund, M., Nymand, J., Kramshøj, M., Ro-Poulsen, Helge & Haugwitz, M. S., 22 Nov 2017, In: Scientific Reports. 7, 13 p., 16035.

      Research output: Contribution to journal › Journal article › Research › peer-review

    3. 2016
    4. Published

      Large increases in Arctic biogenic volatile emissions are a direct effect of warming

      Kramshøj, M., Vedel-Petersen, I., Schollert, M., Rinnan, Åsmund, Nymand, J., Ro-Poulsen, Helge & Rinnan, Riikka, 2016, In: Nature Geoscience. 9, 5, p. 349-352 4 p.

      Research output: Contribution to journal › Letter › Research › peer-review

    5. 2013
    6. Published

      Antagonism between elevated CO2, nighttime warming, and summer drought reduces the robustness of PSII performance to freezing events

      Albert, K. R., Boesgaard, K., Ro-Poulsen, Helge, Mikkelsen, T. N., Andersen, S. & Pilegaard, K., 2013, In: Environmental and Experimental Botany. 93, p. 1-12 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    7. Published

      Does warming affect growth rate and biomass production of shrubs in the High Arctic?

      Campioli, M., Schmidt, N. M., Albert, K. R., Leblans, N., Ro-Poulsen, Helge & Michelsen, Anders, 2013, In: Plant Ecology. 214, 8, p. 1049-1058 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    8. Published

      Reduction of molecular gas diffusion through gaskets in leaf gas exchange cuvettes by leaf-mediated pores

      Boesgaard, K. S., Mikkelsen, T. N., Ro-Poulsen, Helge & Ibrom, A., 2013, In: Plant, Cell and Environment. 36, 7, p. 1352-1362 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    9. 2012
    10. Published

      Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels

      Boesgaard, K. S., Albert, K. R., Ro-Poulsen, Helge, Michelsen, Anders, Mikkelsen, T. N. & Schmidt, N. M., 2012, In: Physiologia Plantarum. 145, 4, p. 540-550 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    11. Published

      Solar UV-B effects on PSII performance in Betula nana are influenced by PAR level and reduced by EDU: results of a 3-year experiment in the High Arctic

      Albert, K. R., Mikkelsen, T. N., Ro-Poulsen, Helge, Arndal, M. F., Boesgaard, K. S., Michelsen, Anders, Bruhn, D. & Schmidt, N. M., 2012, In: Physiologia Plantarum. 145, 3, p. 485-500 16 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    12. Published

      Temperate heath plant response to dry conditions depends on growth strategy and less on physiology

      Albert, K. R., Nielsen, Jane Kongstad, Schmidt, Inger Kappel, Ro-Poulsen, Helge, Mikkelsen, T. N., Michelsen, Anders, Linden, L. V. D. & Beier, Claus, 2012, In: Acta Oecologica. 45, p. 79-87 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    13. Published

      The shift in plant species composition in a subarctic mountain birch forest floor due to climate change would modify the biogenic volatile organic compound mission profile

      Faubert, P., Tiiva, P., Michelsen, Anders, Rinnan, Åsmund, Ro-Poulsen, Helge & Rinnan, Riikka, 2012, In: Plant and Soil. 352, 1-2, p. 199-215 17 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    14. Published

      Up-scaling of water use efficiency from leaf to canopy as based on leaf gas exchange relationships and the modeled in-canopy light distribution

      Linderson, M., Mikkelsen, T. N., Ibrom, A., Lindroth, A., Ro-Poulsen, Helge & Pilegaard, K., 2012, In: Agricultural and Forest Meteorology. 152, p. 201-211 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    15. 2011
    16. Published

      Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica

      Albert, K. R., Mikkelsen, T. N., Ro-Poulsen, Helge, Arndal, M. F. & Michelsen, Anders, 2011, In: Environmental and Experimental Botany. 73, p. 10-18 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    17. Published

      Ambient UV-Bradiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica.

      Albert, K. R., Mikkelsen, T. N., Ro-Poulsen, Helge, Arndal, M. F. & Michelsen, Anders, 2011, In: Environmental and Experimental Botany. 72, 3, p. 439-447 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    18. Published

      Effects of elevated CO2, warming and drought episodes on plant carbon uptake in a temperate heath ecosystem are controlled by soil water status.

      Albert, K. R., Ro-Poulsen, Helge, Mikkelsen, T. N., Michelsen, Anders, van der Linden, L. & Beier, Claus, 2011, In: Plant, Cell and Environment. 34, 7, p. 1207-1222 16 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    19. Published

      Interactive effects of drought, elevated CO2 and warming on photosynthetic capacity and photosystem performance in temperate heath plants

      Albert, K. R., Mikkelsen, T. N., Michelsen, Anders, Ro-Poulsen, Helge & van der Linden, L., 2011, In: Journal of Plant Physiology. 168, 13, p. 1550-61 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    20. Published

      Interactive effects of elevated CO2, warming, and drought on photosynthesis of Deschampsia flexuosa in a temperate heath ecosystem.

      Albert, K. R., Ro-Poulsen, Helge, Mikkelsen, T. N., Michelsen, A., Linden, L. V. D. & Beier, Claus, 2011, In: Journal of Experimental Botany. 62, 12, p. 4253-4266 14 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    21. Published

      Reduced N cycling in response to elevated CO2, warming, and drought in a Danish heathland

      Larsen, K. S., Andresen, L. C., Beier, C., Jonasson, S. E., Albert, K. R., Ambus, P. L., Arndal, M. F., Carter, M. S., Christensen, S., Holmstrup, M., Ibrom, A., Nielsen, J. K., van der Linden, L., Maraldo, K., Michelsen, A., Mikkelsen, T. N., Pilegaard, K., Priemé, A., Ro-Poulsen, H., Schmidt, I. K. & 2 others, Selsted, M. B. & Andersen, K. S., 2011, Nitrogen & global change: key findings - future challenges. 2 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    22. Published

      Reduced N cycling in response to elevated CO2, warming, and drought in a Danish heathland: synthesizing results of the CLIMAITE project after two years of treatments

      Larsen, K. S., Andresen, L. C., Beier, C., Jonasson, S. E., Albert, K. A., Ambus, P. L., Arndal, M. F., Carter, M. S., Christensen, S., Holmstrup, M., Ibrom, A., Nielsen, J. K., Van der Linden, L., Maraldo, K., Michelsen, A., Mikkelsen, T. N., Pilegaard, K., Priemé, A., Ro-Poulsen, H., Schmidt, I. K. & 2 others, Selsted, M. B. & Andersen, K. S., 2011, In: Global Change Biology. 17, 5, p. 1884-1899 16 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    23. 2010
    24. Published

      Improved UV-B screening capacity does not prevent negative effects of ambient UV irradiance on PSII performance in High Arctic plants. Results from a six year UV exclusion study

      Albert, K. R., Mikkelsen, T. N., Ro-Poulsen, Helge, Michelsen, Anders, Arndal, M. F., Bredahl, L., Håkansson, K. B., Boesgaard, K. & Schmidt, N. M., 15 Dec 2010, In: Journal of Plant Physiology. 167, 18, p. 1542-1549 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    25. Published

      Biomonitoring of toxic compounds of airborne particulate matter in urban and industriel areas

      Klumpp, A. & Ro-Poulsen, Helge, 2010, Urban airborne particulate matter: origin, chemistry, fate and health Impacts. Zereini, F. & Wiseman, C. L. S. (eds.). Springer Science+Business Media, p. 467-481 15 p. (Environmental Science and Engineering).

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review

    26. Published

      Volatile organic compound emissions in three high arctic heath types, and the influence of climate change.

      Michelsen, Anders, Burchard, S., Faubert, P., Rinnan, Riikka, Ro-Poulsen, Helge & Schmidt, N. M., 2010, Zackenberg Ecological Research Operations, 15th Annual Report, 2009. . Jensen, L. M. & Rasch, M. (eds.). National Environmental Research Institute, Aarhus University: Aarhus Universitetsforlag, p. 105-106

      Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Communication

    27. 2009
    28. Published

      Airborne trace element pollution in 11 European cities assessed by exposure of standardised ryegrass cultures

      Klumpp, A., Ansel, W., Klumpp, G., Breuer, J., Vergne, P., Sanz, M. J., Rasmussen, S., Ro-Poulsen, Helge, Artola, A. R., Penuelas, J., He, S., Garrec, J. P. & Calatayud, V., 2009, In: Atmospheric Environment. 43, 2, p. 329-339

      Research output: Contribution to journal › Journal article › Research › peer-review

    29. Published

      Atmospheric composition change: ecosystems-atmosphere interactions

      Fowler, D., Pilegaard, K., Sutton, M. A., Ambus, P. L., Raivonen, M., Duyzer, J., Simpson, D., Fagerli, H., Fuzzi, S., Schjørring, J. K., Granier, C., Neftel, A., Isaksen, I. S. A., Laj, P., Maione, M., Monks, P. S., Burkhardt, J., Daemmgen, U., Neirynck, J., Personne, E. & 37 others, Wichink-Kruit, R., Butterbach-Bahl, K., Flechard, C., Tuovinen, J. P., Coyle, M., Gerosa, G., Loubet, B., Altimir, N., Gruenhage, L., Ammann, C., Cieslik, S., Paoletti, E., Mikkelsen, T. N., Ro-Poulsen, Helge, Cellier, P., Cape, J. N., Horvath, L., Loreto, F., Niinemets, Ü., Palmer, P. I., Rinne, J., Misztal, P., Nemitz, E., Nilsson, D., Pryor, S., Gallagher, M. W., Vesala, T., Skiba, U., Brüggemann, N., Zechmeister-Boltenstern, S., Williams, J., O'Dowd, C., Facchini, M. C., de Leeuw, G., Flossman, A., Chaumerliac, N. & Erisman, J. W., 2009, In: Atmospheric Environment. 43, 33, p. 5193-5267 75 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    30. Published

      Ecosystem Recovery after Drought Events in Our Future Climate

      Selsted, M. B., Albert, K., Ambus, Per Lennart, Michelsen, Anders, Ro-Poulsen, Helge, Mikkelsen, T. N. & Ibrom, A., 2009, In: Institute of Physics Conference Series.

      Research output: Contribution to journal › Conference abstract in journal › Research

    31. Published

      Plant and soil responses in ecosystem manipulation experiments

      Boesgaard, K., Mathiesen, K., Albert, K., Ro-Poulsen, Helge, Schmidt, N. M. & Michelsen, Anders, 2009, ZACKENBERG ECOLOGICAL RESEARCH OPERATIONS (ZERO): 14th Annual Report 2008. Jensen, L. M. & Rasch, M. (eds.). Aarhus University: National Environmental Research Institute, p. 88-89

      Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Communication

    32. Published

      Responses of carbon and water fluxes following drought events in combinations with warming and elevated CO2

      Selsted, M. B., Albert, K., Ambus, Per Lennart, Michelsen, Anders, Ro-Poulsen, Helge, Mikkelsen, T. N. & Ibrom, A., 2009, In: Metlan Tyoraportteja. p. 144

      Research output: Contribution to journal › Conference abstract in journal › Research

    33. Published

      Unpredictable responses to interactions between climatic drivers: Impact of warming, elevated CO2, drought and their combinations on photosynthesis and growth patterns of heath plants

      Ro-Poulsen, Helge, Albert, K., Michelsen, Anders, Mikkelsen, T. N. & Beier, C., 2009, In: Metlan Tyoraportteja. p. 346

      Research output: Contribution to journal › Conference abstract in journal › Research

    34. 2008
    35. Published

      Ambient UV-B decreases PSII performance and net photosynthesis under natural irradiance of the high arctic dwarf shrub Salix arctica

      Albert, K., Mikkelsen, T. N., Ro-Poulsen, Helge, Arndal, M. F. & Michelsen, Anders, 2008.

      Research output: Contribution to conference › Conference abstract for conference › Research

    36. Published

      Ambient UV-B radiation decreases photosynthesis in high arctic Vaccinium uliginosum.

      Albert, K., Ro-Poulsen, Helge & N. Mikkelsen, T., 2008, In: Physiologia Plantarum : An International Journal for Plant Biology. 133, 2, p. 199-210 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    37. Published

      Biological responses to current UV-B radiation in Arctic regions

      Albert, K. R., Mikkelsen, T. N. & Ro-Poulsen, Helge, 2008, In: Geophysical Research Abstracts. 10, EGU2008-A-11698

      Research output: Contribution to journal › Conference abstract in journal › Research

    38. Published

      Biological responses to current UV-B radiation in Arctic regions: Geophysical Research Abstracts, Vol. 10, EGU2008-A-11698, 2008. SRef-ID: 1607-7962/gra/EGU2008-A-11698. EGU General Assembly 13-18 2008 April Vienna, Switzerland

      Albert, K., N. Mikkelsen, T. & Ro-Poulsen, Helge, 2008.

      Research output: Contribution to conference › Conference abstract for conference › Research

    39. Published

      Biological responses to current UV-B radiation in Arctic regions: 5th SPPS 2008 PhD conference January 24-27 2008 in Haslev, Denmark

      Albert, K., N. Mikkelsen, T. & Ro-Poulsen, Helge, 2008.

      Research output: Contribution to conference › Conference abstract for conference › Research

    40. Published

      Biological responses to current fluxes of ultraviolet radiation in High Arctic

      Albert, K., Rinnan, R., N. mikkelsen, T., Ro-Poulsen, Helge, Michelsen, Anders, Arndal, M. F. & M. Schmidt, N., 2008.

      Research output: Contribution to conference › Conference abstract for conference › Research

    41. Published

      CLIMAITE - a three factor climate change ecosystem manipulation experiment: Geophysical Research Abstracts, Vol. 10, EGU2008-A-07931, 2008. SRef-ID: 1607-7962/gra/EGU2008-A-07931. EGU General Assembly 13-18 April 2008 in Vienna, Switzerland

      N. Mikkelsen, T., Beier, C., Jonasson, S. E., Holmstrup, M., Schmidt, I. K., Ambus, P. L., Pilegaard, K., Michelsen, A., Albert, K., Andresen, L. C., Arndal, M. F., Bruun, N., Christensen, S., Danbæk, S., Gundersen, P., Jørgensen, P., J. Linden, L., Pedersen, J. K., Maraldo, K., Priemé, A. & 11 others, Riis-Nielsen, T., Ro-Poulsen, Helge, Andersen, K. S., Selsted, M., Sørensen, P., S. Larsen, K., S. Carter, M., Ibrom, A., Martinussen, Torben, Miglietta, F. & Sverdrup, H., 2008.

      Research output: Contribution to conference › Conference abstract for conference › Research

    42. Published

      Effects of manipulations of local climate on carbon dioxide exchange and plant performance in two high arctic heaths

      Michelsen, Anders, Boesgaard, K., Arndal, M. F., Tamstorf, M., Schmidt, N. M., Albert, K. & Ro-Poulsen, Helge, 2008, Zackenberg Ecological Research Operations, 13th Annual Report, 2007.: Danish Polar Center, Danish Agency for Science, Technology and innovation, Ministry of Science, Technology and Innovation.. Klitgaard, A. B. & Rasch, M. (eds.). Copenhagen: Danish Polar Center, p. 70-71

      Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Communication

    43. Published

      Experimental design of multifactor climate change experiments with elevated CO2, warming and drought: the CLIMAITE project

      Mikkelsen, T. N., Beier, C., Jonasson, S. E., Holmstrup, M., Schmidt, I. K., Ambus, P. L., Pilegaard, K., Michelsen, A., Albert, K., Andresen, L. C., Arndal, M. F., Bruun, N., Christensen, S., Danbæk, S., Gundersen, P., Jørgensen, P., Linden, L., Nielsen, J. K., Maraldo, K., Priemé, A. & 11 others, Riis-Nielsen, Torben, Ro-Poulsen, Helge, Andersen, K. S., Selsted, M. B., Sørensen, P., Larsen, Klaus Steenberg, Carter, M. S., Ibrom, A., Martinussen, Torben, Miglietta, F. & Sverdrup, H., 2008, In: Functional Ecology. 22, 1, p. 185-195 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    44. Published

      Future photosynthetic performance of heath plants – results from the multi-factorial ecosystem experiment, CLIMAITE: 5th SPPS 2008 PhD conference January 24-27 2008 in Haslev, Denmark

      Albert, K., N. Mikkelsen, T. & Ro-Poulsen, Helge, 2008.

      Research output: Contribution to conference › Conference abstract for conference › Research

    45. Published

      Plant eco-physiological response patterns to summer drought, elevated CO2 and warming in a natural temperate heath ecosystem: Ecological Society of America, 93rd ESA annual meeting August 3-8, Milwaukee, Wisconsin

      Albert, K., N. Mikkelsen, T., Ro-Poulsen, Helge & Michelsen, Anders, 2008, 93rd ESA Annual Meeting Sunday, August 3 -Friday, August 8, 2008. The Midwest Airlines Center - Milwauke, Wisconsin.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    46. Published

      Plant eco-physiological response patterns to summer drought, elevated CO2, and warming in a semi-natural temperate heath ecosystem

      Ro-Poulsen, Helge, Albert, K., Mikkelsen, T. N. & Michelsen, Anders, 2008.

      Research output: Contribution to conference › Conference abstract for conference › Research

    47. Published

      Solar Ultraviolet-B radiation at Zackenberg: The impact on higher plants and soil microbial communities: In: High-arctic ecosystem dynamics in a changing climate (eds H. Meltofte, T.R. Christensen, B. Elberling, M. Forchhammer, M. Rasch)

      Albert, K., Rinnan, R., Ro-Poulsen, Helge, Mikkelsen, T., Håkansson, K., F. Arndal, M. & Michelsen, Anders, 2008, New York: Elsevier. 421 p. (Advances in Ecological Research, Vol. 40).

      Research output: Book/Report › Anthology › Research › peer-review

    48. Published

      Studies of Plant Responses to UV-B radiation 2007

      Albert, K., Boesgaard, K., Ro-Poulsen, Helge, N. Mikkelsen, T., Michelsen, Anders & M. Schmidt, N., 2008, Zackenberg Ecological Research Operations, 13th Annual Report, 2007. Copenhagen) , Danish Polar Center, Danish Agency for Science, Technology and Innovation, Ministry of Science, Technology and Innovation. klitgaard, A. B. & Rasch, M. (eds.). Danish Polar Center, Danish Agency for Science, Technology and Innovation, Ministry of Science, Technology and Innovation, Copenhagen: Danish Polar Center, p. 80-81

      Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Communication

    49. 2007
    50. Published

      CLIMAITE – a three factor climate change ecosystem manipulation experiment

      N. Mikkelsen, T., Beier, C., Albert, K. & Ro-Poulsen, Helge, 2007, In: Geophysical Research Abstracts. 10

      Research output: Contribution to journal › Conference abstract in journal › Research

    51. Published

      Effects of manipulations of local climate on processes and organisms in high arctic terrestrial ecosystems

      Michelsen, Anders, Ellebjerg, S., Tamstorf, M., Schmidt, N. M., Illeris, L., Albert, K. & Ro-Poulsen, Helge, 2007, Zackenberg Ecological Research Operations. 12th Annual Report 2006. Klitgaard, A. B., Rasch, M. & Canning, K. (eds.). Copenhagen, DK: Nyt Nordisk Forlag Arnold Busck, p. 80-81 2 p.

      Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Communication

    52. Published

      Klimaændringer og processer og funktion i terrestiske økosystemer

      Schmidt, Inger Kappel, Beier, C., Nielsen, Jane Kongstad, Andresen, L., Michelsen, Anders, Albert, K., Ambus, Per Lennart, Selsted, M., Maraldo, K., Holmstrup, M., Arndal, M. F., Mikkelsen, T. N., Ro-Poulsen, Helge, Jonassen, S. & Karsten, R. J., 2007, In: Flora og Fauna. 113, 4, p. 117-128 12 p.

      Research output: Contribution to journal › Journal article › Research

    53. 2006
    54. Published

      Effects of climate manipulations on processes and organisms in high arctic terrestrial ecosystems

      Michelsen, Anders, Kønig, S. M., Illeris, L., Arndal, M., Albert, K., Tamstorf, M. P. & Ro-Poulsen, Helge, 2006, Zackenberg Ecological Research Operations11th Annual Report, 2005: Copenhagen, Danish Polar Center, Ministry of Science, Technology andInnovation, 2006.. Klitgaard, A. B., Rasch, M. & Caning, K. (eds.). Copenhagen: Danish Polar Center, p. 89-90

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Communication

    55. Published

      How does prolonged drought affect plant physiological processes? - Focus on the interactions with increased temperature and elevated [CO2] within the CLIMAITE project?

      Albert, K., Ro-Poulsen, Helge & N. Mikkelsen, T., 2006.

      Research output: Contribution to conference › Conference abstract for conference › Research

    56. Published

      Ozone pollution and ozone biomonitoring in European cities Part II. Ozone-induced plant injury and its relationship with descriptors of ozone pollution

      Klumpp, A., Ansel, W., Klumpp, G., Vergne, P., Sifakis, N., Sanz, M. J., Rasmussen, S., Ro-Poulsen, Helge, Ribas, A., Penuelas, J., Kambezidis, H., He, S., Garrec, J. P. & Calatayud, V., 2006, In: Atmospheric Environment. 40, 38, p. 7437-7448

      Research output: Contribution to journal › Journal article › Research › peer-review

    57. Published

      Ozone pollution and ozone biomonitoring in European cities. Part I: Ozone concentrations and cumulative exposure indices at urban and suburban sites

      Klumpp, A., Ansel, W., Klumpp, G., Calatayud, V., Garrec, J. P., He, S., Penuelas, J., Ribas, A., Ro-Poulsen, Helge, Rasmussen, S., Sanz, M. J. & Vergne, P., 2006, In: Atmospheric Environment. 40, 40, p. 7963-7974

      Research output: Contribution to journal › Journal article › Research › peer-review

    58. Published

      Studying effects of current UV-fluxes on high arctic vegetation (UV-B exclusion experiments)

      Albert, K., Arndal, M. F., Michelsen, Anders, Tamstorf, M., Ro-Poulsen, Helge & N. Mikkelsen, T., 2006, Zackenberg Ecological Research Operations 11th Annual Report, 2005: Copenhagen, Danish Polar Center, Ministry of Science, Technology andInnovation, 2006. Klitgaard, A. B., Rasch, M. & Caning, K. (eds.). Danish Polar Center, p. 90-91

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Communication

    59. Published

      The Biological Time Machine - Biological responses to multiple environmental and climatic changes: Environment and Stress, Ph.d. symposium at KVL October 2006

      Albert, K., Ro-Poulsen, Helge, N. Mikkelsen, T., Michelsen, Anders, Beier, C., Jonasson, S. E., Ambus, Per Lennart, Schmidt, Inger Kappel, Holmstrup, M., Priemé, Anders & Christensen, Søren, 2006.

      Research output: Contribution to conference › Conference abstract for conference › Research

    60. Published

      Tradescantia micronucleus test indicates genotoxic potential of traffic emissions in European cities.

      Klumpp, A., Ansel, W., Klumpp, G., Calatayud, V., Garrec, J. P., He, S., Penuelas, J., Ribas, A., Ro-Poulsen, Helge, Rasmussen, S., Sanz, M. J. & Vergne, P., 2006, In: Environmental Pollution. 139, 3, p. 515-522

      Research output: Contribution to journal › Journal article › Research › peer-review

    61. 2005
    62. Published

      Ambient UV-radiation decreases photosynthetic performance on High Arctic plants

      Albert, K., Ro-Poulsen, Helge & N. Mikkelsen, T., 2005.

      Research output: Contribution to conference › Conference abstract for conference › Research

    63. Published

      Ambient ultraviolet radiation in the Arctic reduces root biomass and alters microbial community composition but has no effects on microbial biomass

      Rinnan, R., Keinänen, M. M., Kasurinen, A., Asikainen, J., Kekki, T. K., Holopainen, T., Ro-Poulsen, Helge, Mikkelsen, T. N. & Michelsen, Anders, 2005, In: Global Change Biology. 11, 4, p. 564 - 574

      Research output: Contribution to journal › Journal article › Research › peer-review

    64. Published

      Effects of Reducing the Ambient UV-B Radiation in the High Arctic on Salix arctica and Vaccinium uliginosum.

      Albert, K., Ro-Poulsen, Helge, Mikkelsen, T. N., Bredahl, L. & Haakansson, K. B., 2005, In: Phyton. 45, 4, p. 41-49

      Research output: Contribution to journal › Journal article › Research › peer-review

    65. Published

      Effects of ambient versus reduced UV-B radiation on high arctic Salix arctica assessed by measurements and calculations of chlorophyll a fluorescence parameters from fluorescence transients

      Albert, K., Mikkelsen, T. N. & Ro-Poulsen, Helge, 2005, In: Physiologia Plantarum : An International Journal for Plant Biology. 124, 2, p. 208-226

      Research output: Contribution to journal › Journal article › Research › peer-review

    66. Published

      Monitoring effects of UV-B radiation on high arctic vegetation

      Albert, K. R., Ro-Poulsen, Helge, Mikkelsen, T. N., Håkansson, K. B., Bredahl, L. & Rinnan, R., 2005, Zackenberg Ecological Research Operations, 10th Annual Report, 2004. Copenhagen K: Danish Polar Center, p. 68-70

      Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Communication

    67. 2004
    68. Published

      Effects of UV-B radiation on vegetation in Zackenberg: In Rasch, M. and Caning, K. (eds.) Zackenberg Ecological Research Operations, 9th Annual Report, 2003. - Copenhagen, Danish Polar Center, Ministry of Science, Technology and Innovation

      Ro-Poulsen, Helge, N. Mikkelsen, T., Bredahl, L., Albert, K., B. Håkansson, K. & Rinnan, R., 2004

      Research output: Book/Report › Report › Communication

    69. Published

      Five-year measurements of ozone fluxes to a Danish Norway spruce canopy

      Mikkelsen, T. N., Ro-Poulsen, Helge, Hovmand, Mads Frederik, Jensen, N. O., Pilegaard, K. & Egeløv, A. H., 2004, In: Atmospheric Environment. 38, 15, p. 2361-2371 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    70. Published

      Growing-season carbon dioxide flux in a dry subarctic heath: Responses to long-term manipulations

      Illeris, L., Kønig, S. M., Grogan, P., Jonasson, S. E., Michelsen, Anders & Ro-Poulsen, Helge, 2004, In: Arctic, Antarctic, and Alpine Research. 36, p. 456-463

      Research output: Contribution to journal › Journal article › Research › peer-review

    71. Published

      Monitering af UV-belastningen af vegetationen i Zackenberg. Tre års undersøgelser af UV-B effekter på højarktisk vegetation i NØ-Grøndland, Zackenberg. Opsummerende rapport til Miljøstyrelsen vedr. DANCEA-bevilling J.nr.M 123/000-0212

      Ro-Poulsen, Helge, Albert, K. & N. Mikkelsen, T., 2004, 12 p.

      Research output: Book/Report › Report › Communication

    72. Published

      Reduction of the Ambient UV-B Radiation in the High Arctic Increases Fv/Fm in Salix arctica and Vaccinium uliginosum and Reduces Stomatal Conductance and Internal CO2 Concentration in Salix arctica

      Bredahl, L., Ro-Poulsen, Helge & Mikkelsen, T. N., 2004, In: Arctic, Antarctic, and Alpine Research. 36, p. 363-368

      Research output: Contribution to journal › Journal article › Research › peer-review

    73. 2003
    74. Published

      Field measurements of atmosphere-biosphere interactions in a Danish beech forest

      Pilegaard, K., Mikkelsen, T., Beier, Claus, Jensen, N., Ambus, Per Lennart & Ro-Poulsen, Helge, 10 Dec 2003, In: Boreal Environment Research. 8, 4, p. 315-333 19 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    75. Published

      Effects of UV-B radiation on vegetation in Zackenberg: In Rasch, M. and Caning, K. (eds.) Zackenberg Ecological Research Operations, 8th Annual Report, 2002. - Copenhagen, Danish Polar Center, Ministry of Science, Technology and Innovation, 2003.

      N. Mikkelsen, T., Ro-Poulsen, Helge, Bredahl, L. & Albert, K., 2003

      Research output: Book/Report › Report › Communication

    76. Published

      Field measurements of atmosphere-surface interactions in a Danish beech forest

      Pilegaard, K., Mikkelsen, T. N., Beier, C., Jensen, N. O., Ambus, Per Lennart & Ro-Poulsen, Helge, 2003, In: Boreal Environmental Research. 8, p. 315-333

      Research output: Contribution to journal › Journal article › Research › peer-review

    77. 2002
    78. Published

      In situ Autumn ozone fumigation of mature Norway Spruce - Effects on Net Photosynthesis

      Mikkelsen, T. N. & Ro-Poulsen, Helge, 2002, In: Phyton (Austria). 42, p. 97-104

      Research output: Contribution to journal › Journal article › Research › peer-review

    79. Published

      EuroBionet: A Pan-European biomonotoring network for urban air quality assessment

      Klumpp, A., Ansel, W., Klumpp, G., Belluzzo, N., Calatayud, V., Chaplin, N., Garrec, J. P., Gutsche, H-J., Hayes, M., Hentze, H-W., Kambezidis, H., Laurent, O., Penuelas, J., Rasmussen, S., Ribas, A., Ro-Poulsen, H., Rossi, S., Sanz, M. J., Shang, H., Sifakis, N. & 1 others, Vergne, P., 2002, In: Environmental Science and Pollution Research. 9, p. 199-203

      Research output: Contribution to journal › Journal article › Research › peer-review

    80. 2001
    81. Published

      Comparisons of measured and modelled ozone deposition to forests in northern Europe

      Touvinen, J. P., Simpson, D., Mikkelsen, T. N., Emberson, L. D., Ashmore, M. R., Aurela, M., Cambridge, H. M., Hovmand, Mads Frederik, Jensen, N. O., Laurila, T., Pilegaard, K. & Ro-Poulsen, Helge, 2001, In: Water, Air & Soil Pollution: Focus. 1, 5, p. 263-274 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    82. 2000
    83. Published

      Ozone uptake by an evergreen forest canopy: temporal variation and possible mechanisms

      Mikkelsen, T. N., Ro-Poulsen, Helge, Pilegaard, K., Hovmand, Mads Frederik, Jensen, N. O., Christensen, C. S. & Hummelshoej, P., 2000, In: Environmental Pollution. 109, 3, p. 423-429 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    84. 1998
    85. Published

      Impacts of ozone on forests: A European perspective

      Skärby, L., Ro-Poulsen, Helge, Wellburn, F. A. M. & Sheppard, L. J., 1998, In: New Phytologist. 139, p. 109-122

      Research output: Contribution to journal › Journal article › Research › peer-review

    86. Published

      Ozone deposition in relation to canopy physiology in a mixed conifer forest in Denmark

      Ro-Poulsen, Helge, Mikkelsen, T. N., Hovmand, Mads Frederik, Hummelshøj, P. & Jensen, N. O., 1998, In: Chemosphere. 36, 4-5, p. 669-674 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    87. 1997
    88. Published

      Carbon dioxide fluxes above a coniferous/hardwood stand in relation to climate - consecutive measurements from 17 months

      Mikkelsen, T. N., Ro-Poulsen, Helge, Hummelshøj, P. & Jensen, N. O., 1997, Impacts of global change on tree physiology and forest ecosystems, Forestry Sciences, vol. 52. Dordrecht, Holland: Kluwer Academic Publishers, p. 331-336

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research

    89. Published

      Effects of increased UV-B radiation and elevated levels of tropospheric ozone on physiological processes in European Beech (Fagus sylvatica)

      Zeuthen, J., Mikkelsen, T. N., Ro-Poulsen, Helge & Paludan-Müller, G., 1997, In: Physiologia Plantarum : An International Journal for Plant Biology. 100, p. 281-290

      Research output: Contribution to journal › Journal article › Research › peer-review

    90. 1996
    91. Published

      Carbon and water balance for a mixed forest stand in relation to ozone uptake

      Mikkelsen, T. N., Ro-Poulsen, Helge, Hovmand, M. F., Hummelshøj, P. & Jensen, N. O., 1996, Critical levels for Ozone-Experiments with crops, wild plants and forest tree species in the Nordic countries. København: Nordic Council of Ministers, p. 80-85

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research

    92. Published

      Critical levels of ozone for wood production of European beech (Fagus Sylvatica L.)

      Mortensen, L., Bastrup-Birk, A. & Ro-Poulsen, Helge, 1996, In: Water, Air and Soil Pollution. 85, p. 1349-1354

      Research output: Contribution to journal › Journal article › Research

    93. Published

      Ozone effects on primary productivity in current year shoots of 35 years old Norway spruce

      Mikkelsen, T. N. & Ro-Poulsen, Helge, 1996, Critical levels for Ozone-Experiments with crops, wild plants and forest tree species in the Nordic countries. København: Nordic Council of Ministers, p. 73-79

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research

    94. 1995
    95. Published

      Long term in situ measurements of gas exchange in a Norway spruce canopy at ambient and elevated ozone levels using a light weight chamber system - chamber design and preliminary results

      Mikkelsen, T. N. & Ro-Poulsen, Helge, 1995, In: Water, Air and Soil Pollution. 85 (3), p. 1413-1418

      Research output: Contribution to journal › Journal article › Research › peer-review

    96. 1994

    97. Atmosfærens stoftilførsel til danske skovøkosystemer

      Hovmand, Mads Frederik, Andersen, H. V., Bille-Hansen, J. & Ro-Poulsen, Helge, 1994, In: Danmarks Miljoeundersoegelser. Faglig Rapport. 98, p. 59

      Research output: Contribution to journal › Journal article › Research › peer-review

    98. Published

      Critical levels for tropospheric ozone

      Mikkelsen, T. N., Ro-Poulsen, Helge & et al, 1994, København: Nordic Council of Ministers. 63 p.

      Research output: Book/Report › Book › Research

    99. Published

      Exposure of Norway spruce to ozone increases the sensitivity of current years needles to photoinhibition and desiccation

      Mikkelsen, T. N. & Ro-Poulsen, Helge, 1994, In: New Phytologist. 128, p. 153-163

      Research output: Contribution to journal › Journal article › Research › peer-review

    100. 1993
    101. Published

      Modelling the effect of fluxes of pollution to forest by coordinated measurements of permanent plot ecosystems, 92.60DK.DK003.0 and 93.60.DK003.0 (Fællesrapport til CEC fra FLS, DMU, Risø og KU)

      Ro-Poulsen, Helge, 1993, København.

      Research output: Book/Report › Book › Research

    102. Published

      Physiology of the Norway spruce trees growing on the danish EXMAN site

      Mikkelsen, T. N. & Ro-Poulsen, Helge, 1993, Experimental Manipulations of biota and biogeochemical cycling in Ecosystems. Ecosystems Research Report 4. Brussels, p. 244-246

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research

    103. 1991
    104. Published

      Miljø og restprodukter. Gasformige luftforureningers effekter på danske plantesamfund

      Johnson, I., Ro-Poulsen, Helge, Søchting, Ulrik & Mortensen, L., 1991, Danmark: Energiministeriets Forskningsudvalg.

      Research output: Book/Report › Book › Research

    105. 1989
    106. Published

      A delayed effect of ozone fumigation on photosynthesis of Norway spruce

      Eamus, D., Barnes, J. D., Mortensen, L., Ro-Poulsen, Helge & Davison, A. W., 1989, In: Annals of Forest Science. 46 (suppl.), p. 568-572

      Research output: Contribution to journal › Journal article › Research

    ID: 7631