Helge Ro-Poulsen

Search results

• 2017

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

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

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

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  36 Citations (Scopus)

  187 Downloads (Pure)
• 2013

  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, H., 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
  6 Citations (Scopus)

• 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, H. & Michelsen, A., 2013, In: Plant Ecology. 214, 8, p. 1049-1058 10 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  29 Citations (Scopus)

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

  Boesgaard, K. S., Mikkelsen, T. N., Ro-Poulsen, H. & 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

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  12 Citations (Scopus)

  345 Downloads (Pure)
• 2012

  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, H., Michelsen, A., 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
  8 Citations (Scopus)

• 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, H., Arndal, M. F., Boesgaard, K. S., Michelsen, A., 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
  7 Citations (Scopus)

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

  Albert, K. R., Nielsen, J. K., Schmidt, I. K., Ro-Poulsen, H., Mikkelsen, T. N., Michelsen, A., Linden, L. V. D. & Beier, C., 2012, In: Acta Oecologica. 45, p. 79-87 9 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  8 Citations (Scopus)

• 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, A., Rinnan, Å., Ro-Poulsen, H. & Rinnan, R., 2012, In: Plant and Soil. 352, 1-2, p. 199-215 17 p.

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

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  54 Citations (Scopus)

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

  Research output: Contribution to journal › Journal article › Research › peer-review
  49 Citations (Scopus)
• 2011

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

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

  Research output: Contribution to journal › Journal article › Research › peer-review
  34 Citations (Scopus)

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

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

  Research output: Contribution to journal › Journal article › Research › peer-review
  39 Citations (Scopus)

• 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, H., Mikkelsen, T. N., Michelsen, A., van der Linden, L. & Beier, C., 2011, In: Plant, Cell and Environment. 34, 7, p. 1207-1222 16 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  65 Citations (Scopus)

• 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, A., Ro-Poulsen, H. & 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
  115 Citations (Scopus)

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

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

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

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  78 Citations (Scopus)

  740 Downloads (Pure)

• 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
  220 Citations (Scopus)
• 2010

  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, H., Michelsen, A., 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
  20 Citations (Scopus)
• 2009

  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, H., 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
  44 Citations (Scopus)

• 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, H., 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
  555 Citations (Scopus)
• 2008

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

  Albert, K., Ro-Poulsen, H. & 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

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  47 Citations (Scopus)

  1526 Downloads (Pure)

• 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, T., Ro-Poulsen, H., Andersen, K. S., Selsted, M. B., Sørensen, P., Larsen, K. S., Carter, M. S., Ibrom, A., Martinussen, T., 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

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  131 Citations (Scopus)

  425 Downloads (Pure)
• 2007

  Klimaændringer og processer og funktion i terrestiske økosystemer

  Schmidt, I. K., Beier, C., Pedersen, J. K., Andresen, L., Michelsen, A., Albert, K., Ambus, P. L., Selsted, M., Maraldo, K., Holmstrup, M., Arndal, M. F., Mikkelsen, T. N., Ro-Poulsen, H., 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
• 2006

  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, H., 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
  54 Citations (Scopus)

• 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, H., 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
  52 Citations (Scopus)

• 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, H., 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
  43 Citations (Scopus)
• 2005

  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, H., Mikkelsen, T. N. & Michelsen, A., 2005, In: Global Change Biology. 11, 4, p. 564 - 574

  Research output: Contribution to journal › Journal article › Research › peer-review
  47 Citations (Scopus)

• 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, H., 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
  51 Citations (Scopus)

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

  Albert, K., Ro-Poulsen, H., 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

  Open Access

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  4 Citations (Scopus)

  537 Downloads (Pure)
• 2004

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

  Mikkelsen, T. N., Ro-Poulsen, H., Hovmand, M. F., 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
  67 Citations (Scopus)

• 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, A. & Ro-Poulsen, H., 2004, In: Arctic, Antarctic, and Alpine Research. 36, p. 456-463

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

  36 Citations (Scopus)

• 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, H. & Mikkelsen, T. N., 2004, In: Arctic, Antarctic, and Alpine Research. 36, p. 363-368

  Research output: Contribution to journal › Journal article › Research › peer-review
• 2003

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

  Pilegaard, K., Mikkelsen, TN., Beier, C., Jensen, NO., Ambus, P. L. & Ro-Poulsen, H., 10 Dec 2003, In: Boreal Environment Research. 8, 4, p. 315-333 19 p.

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

  79 Citations (Scopus)

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

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

  Research output: Contribution to journal › Journal article › Research › peer-review
• 2002

  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

  50 Citations (Scopus)

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

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

  Research output: Contribution to journal › Journal article › Research › peer-review
• 2001

  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, M. F., Jensen, N. O., Laurila, T., Pilegaard, K. & Ro-Poulsen, H., 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

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

  Mikkelsen, T. N., Ro-Poulsen, H., Pilegaard, K., Hovmand, M. F., 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
  48 Citations (Scopus)
• 1998

  Impacts of ozone on forests: A European perspective

  Skärby, L., Ro-Poulsen, H., 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

  193 Citations (Scopus)

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

  Ro-Poulsen, H., Mikkelsen, T. N., Hovmand, M. F., 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
  12 Citations (Scopus)
• 1997

  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, H. & 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

  48 Citations (Scopus)
• 1996

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

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

  Research output: Contribution to journal › Journal article › Research
• 1995

  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, H., 1995, In: Water, Air and Soil Pollution. 85 (3), p. 1413-1418

  Research output: Contribution to journal › Journal article › Research › peer-review
• 1994

  Atmosfærens stoftilførsel til danske skovøkosystemer

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

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

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

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

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

  30 Citations (Scopus)
• 1989

  A delayed effect of ozone fumigation on photosynthesis of Norway spruce

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

  Research output: Contribution to journal › Journal article › Research