Helge Ro-Poulsen
Emeritus
- 2005
- 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
- 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 - 574Research output: Contribution to journal › Journal article › Research › peer-review
- 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. 41-49Research output: Contribution to journal › Journal article › Research › peer-review
- 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. 208-226Research output: Contribution to journal › Journal article › Research › peer-review
- 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. 68-70Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Communication
- 2004
- 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., 2004Research output: Book/Report › Report › Communication
- 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
- 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. 456-463Research output: Contribution to journal › Journal article › Research › peer-review
- 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
- 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. 363-368Research output: Contribution to journal › Journal article › Research › peer-review
- 2003
- 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
- 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., 2003Research output: Book/Report › Report › Communication
- 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. 315-333Research output: Contribution to journal › Journal article › Research › peer-review
- 2002
- 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. 97-104Research output: Contribution to journal › Journal article › Research › peer-review
- 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, , 2002, In: Environmental Science and Pollution Research. 9, p. 199-203Research output: Contribution to journal › Journal article › Research › peer-review
- 2001
- 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
- 2000
- 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
- 1998
- 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. 109-122Research output: Contribution to journal › Journal article › Research › peer-review
- 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
- 1997
- 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. 331-336Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
- 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. 281-290Research output: Contribution to journal › Journal article › Research › peer-review
- 1996
- 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. 80-85Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
- 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. 1349-1354Research output: Contribution to journal › Journal article › Research
- 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. 73-79Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
- 1995
- 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. 1413-1418Research output: Contribution to journal › Journal article › Research › peer-review
ID: 7631
Most downloads
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2121
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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)
Research output: Book/Report › Anthology › Research › peer-review
Published -
1474
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Ambient UV-B radiation decreases photosynthesis in high arctic Vaccinium uliginosum.
Research output: Contribution to journal › Journal article › Research › peer-review
Published -
939
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The Biological Time Machine - Biological responses to multiple environmental and climatic changes: Environment and Stress, Ph.d. symposium at KVL October 2006
Research output: Contribution to conference › Conference abstract for conference › Research
Published