L. H. Allen, B. G. Drake, H. H. Rogers, and J. H. Shinn, Field Techniques for Exposure of Plants and Ecosystems to Elevated CO~2 and Other Trace Gases, Critical Reviews in Plant Sciences, vol.11, issue.2, pp.85-119, 1992.
DOI : 10.1080/713608028

C. V. Barton, H. S. Lee, and P. G. Jarvis, A branch bag and CO2 control system for long-term CO2 enrichment of mature Sitka spruce [Picea sitchensis (Bong.) Carr.], Plant, Cell and Environment, vol.15, issue.9, pp.1139-1148, 1993.
DOI : 10.1146/annurev.ecolsys.22.1.309

J. Bergh and S. Linder, Effects of soil warming during spring on photosynthetic recovery in boreal Norway spruce stands, Global Change Biology, vol.15, issue.1, pp.245-253, 1999.
DOI : 10.1007/s004680050131

J. Bergh, S. Linder, T. Lundmark, and B. Elfving, The effect of water and nutrient availability on the productivity of Norway spruce in northern and southern Sweden, Forest Ecology and Management, vol.119, issue.1-3, pp.51-62, 1999.
DOI : 10.1016/S0378-1127(98)00509-X

W. J. Burroughs, Climate Change ? a Multidisciplinary Approach, 2001.

E. Ceschia, Environmental effects on spatial and seasonal variations of stem respiration in European beech and Norway spruce, Silvestria, vol.219, 2001.

J. H. Christensen, J. Räisänen, T. Iverson, D. Bjørge, O. B. Christensen et al., A synthesis of regional climate change simulations-A Scandinavian perspective, Geophysical Research Letters, vol.125, issue.6, pp.1003-1006, 2001.
DOI : 10.1029/2000GL012196

D. Comstedt, B. Boström, J. D. Marshall, A. Holm, M. Slaney et al., Effects of elevated [CO 2 ] and temperature on soil respiration in a boreal forest using ? 13 C as a labelling tool, 2006.

U. Cubasch, G. Meehl, G. Boer, M. Stouffer, A. Dix et al., Projections of future climate change. In Climate Change 2001: the Scientific Basis. Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change, pp.525-582, 2001.

P. S. Curtis, A meta-analysis of leaf gas exchange and nitrogen in trees grown under elevated carbon dioxide, Plant, Cell and Environment, vol.10, issue.2, pp.127-137, 1996.
DOI : 10.1007/BF00317605

C. Damesin, E. Ceschia, L. Goff, N. Ottorini, J. Dufrêne et al., Stem and branch respiration of beech: from tree measurements to estimations at the stand level, New Phytologist, vol.32, issue.1, pp.159-172, 2002.
DOI : 10.1046/j.0028-646X.2001.00296.x

B. G. Drake, M. A. Gonzàlez-meler, and S. P. Long, ?, Annual Review of Plant Physiology and Plant Molecular Biology, vol.48, issue.1, pp.609-639, 1997.
DOI : 10.1146/annurev.arplant.48.1.609

P. M. Fransson, A. F. Taylor, and R. D. Finlay, Elevated atmospheric CO2 alters root symbiont community structure in forest trees, New Phytologist, vol.23, issue.3, pp.431-442, 2001.
DOI : 10.1023/A:1004290719824

J. G. Hamilton, R. B. Thomas, and E. H. Delucia, Direct and indirect effects of elevated CO2 on leaf respiration in a forest ecosystem, Plant, Cell and Environment, vol.121, issue.9, pp.975-982, 2001.
DOI : 10.1006/anbo.1997.0434

G. R. Hendrey, D. S. Ellsworth, K. F. Lewin, and J. Nagy, A free-air enrichment system for exposing tall forest vegetation to elevated atmospheric CO2, Global Change Biology, vol.22, issue.2, pp.293-309, 1999.
DOI : 10.1046/j.1469-8137.1998.00221.x

J. D. Herrick and R. B. Thomas, enrichment at the Duke Forest FACE experiment, Plant, Cell & Environment, vol.44, issue.105, pp.53-64, 2001.
DOI : 10.1046/j.1365-3040.2001.00652.x

M. E. Jach and R. Ceulemans, Effects of elevated atmospheric CO2 on phenology, growth and crown structure of Scots pine (Pinus sylvestris) seedlings after two years of exposure in the field, Tree Physiology, vol.19, issue.4-5, pp.289-300, 1999.
DOI : 10.1093/treephys/19.4-5.289

C. D. Keeling, J. F. Chin, and T. P. Whorf, Increased activity of northern vegetation inferred from atmospheric CO2 measurements, Nature, vol.382, issue.6587, pp.146-149, 1996.
DOI : 10.1038/382146a0

S. Kellomäki and K. Y. Wang, Photosynthetic responses of Scots pine to elevated CO2 and nitrogen supply: results of a branch-in-bag experiment, Tree Physiology, vol.17, issue.4, pp.231-240, 1997.
DOI : 10.1093/treephys/17.4.231

S. Kellomäki, K. Wang, and M. Lemettinen, Controlled environment chambers for investigating tree response to elevated CO 2 and temperature under boreal conditions, Photosynthetica, vol.38, issue.1, pp.69-81, 2000.
DOI : 10.1023/A:1026795924459

C. Körner, Carbon limitation in trees, Journal of Ecology, vol.71, issue.1, pp.4-17, 2003.
DOI : 10.1046/j.1365-2435.1998.00278.x

C. Körner, R. Asshoff, O. Bignucolo, S. Hättenschwiler, S. G. Keel et al., Carbon Flux and Growth in Mature Deciduous Forest Trees Exposed to Elevated CO2, Science, vol.309, issue.5739, pp.1360-1362, 2005.
DOI : 10.1126/science.1113977

K. Kostiainen, S. Kaakinen, P. Saranpää, S. Linder, B. Sigurdsson et al., Effect of elevated [CO2] on stem wood properties of mature Norway spruce grown at different soil nutrient availability, Global Change Biology, vol.10, issue.9, pp.1526-1538, 2004.
DOI : 10.1046/j.1365-3040.1997.d01-140.x

S. Linder, Foliar analysis for detecting and correcting nutrient imbalances in Norway spruce, Ecological Bulletins (Copenhagen ), vol.44, pp.178-190, 1995.

R. Liozon, F. Badeck, B. Genty, S. Meyer, and B. Saugier, Leaf photosynthetic characteristics of beech (Fagus sylvatica) saplings during three years of exposure to elevated CO2 concentration, Tree Physiology, vol.20, issue.4, pp.239-247, 2000.
DOI : 10.1093/treephys/20.4.239

Y. Luo, B. Su, and W. S. Currie, Progressive Nitrogen Limitation of Ecosystem Responses to Rising Atmospheric Carbon Dioxide, BioScience, vol.54, issue.8, pp.731-740, 2004.
DOI : 10.1641/0006-3568(2004)054[0731:PNLOER]2.0.CO;2

B. E. Medlyn, C. V. Barton, and M. S. Broadmeadow, Stomatal conductance of forest species after long-term exposure to elevated CO2 concentration: a synthesis, New Phytologist, vol.282, issue.2, pp.247-264, 2001.
DOI : 10.1034/j.1399-3054.1997.1000420.x

M. B. Murray, R. I. Smith, A. Friend, and P. G. Jarvis, Effect of elevated [CO2] and varying nutrient application rates on physiology and biomass accumulation of Sitka spruce (Picea sitchensis), Tree Physiology, vol.20, issue.7, pp.421-434, 2000.
DOI : 10.1093/treephys/20.7.421

R. J. Norby and Y. Luo, Evaluating ecosystem responses to rising atmospheric CO2 and global warming in a multi-factor world, New Phytologist, vol.13, issue.2, pp.281-293, 2004.
DOI : 10.1073/pnas.0932734100

R. J. Norby, S. D. Wullschleger, C. A. Gunderson, D. W. Johnson, and R. Ceulemans, in field experiments: implications for the future forest, Plant, Cell and Environment, vol.10, issue.6, pp.683-714, 1999.
DOI : 10.1007/BF00010791

J. Räisänen and R. Joelsson, Changes in average and extreme precipitation in two regional climate model experiments, Tellus A, vol.53, issue.5, pp.547-566, 2001.
DOI : 10.1034/j.1600-0870.2001.00262.x

J. Räisänen, M. Rummukainen, and A. Ullerstig, Downscaling of greenhouse gas induced climate change in two GCMs with the Rossby Centre regional climate model for northern Europe, Tellus A, vol.53, issue.2, pp.168-191, 2001.
DOI : 10.1034/j.1600-0870.2001.00168.x

P. Robertnz, Effects of long-term CO 2 enrichment and nutrient availability in Norway spruce. I. Phenology and morphology of branches, Trees, vol.13, pp.188-198, 1999.

P. Robertnz and J. Stockfors, Effects of elevated CO 2 concentration and nutrition on net photosynthesis, stomatal conductance and needle respiration of field-grown Norway spruce trees, Tree Physiology, vol.18, pp.233-241, 1998.

B. Saugier, A. Granier, J. Y. Pontailler, E. Dufrêne, and D. D. Baldocchi, Transpiration of a boreal pine forest measured by branch bag, sap flow and micrometeorological methods, Tree Physiology, vol.17, issue.8-9, pp.511-519, 1997.
DOI : 10.1093/treephys/17.8-9.511

H. Saxe, D. S. Ellsworth, and J. Heath, Tree and forest functioning in an enriched CO2 atmosphere, New Phytologist, vol.139, issue.3, pp.395-436, 1998.
DOI : 10.1046/j.1469-8137.1998.00221.x

H. Saxe, M. G. Cannell, Ø. Johnsen, M. G. Ryan, and G. Vourlitis, Tree and forest functioning in response to global warming, New Phytologist, vol.104, issue.96, pp.369-400, 2001.
DOI : 10.1046/j.1469-8137.2001.00057.x

M. Slaney, Impact of elevated temperature and [CO 2 ] on spring phenology and photosynthetic recovery of boreal Norway spruce, 2006.

M. Slaney, G. Wallin, J. Medhurst, and S. Linder, review) Impact of elevated CO 2 and temperature on spring phenology of boreal Norway spruce

J. Stockfors and S. Linder, Effect of nitrogen on the seasonal course of growth and maintenance respiration in stems of Norway spruce trees, Tree Physiology, vol.18, issue.3, pp.155-166, 1998.
DOI : 10.1093/treephys/18.3.155

J. Stockfors and S. Linder, The effect of nutrition on the seasonal course of needle respiration in Norway spruce stands, Trees, vol.12, issue.3, pp.130-138, 1998.
DOI : 10.1007/s004680050131

O. Urban, D. Janout, R. Pokorny, I. Marková, M. Pavelka et al., Glass domes with adjustable windows: a novel technique for exposing juvenile forest stands to elevated CO 2 concentration, Photosynthetica, vol.39, issue.3, pp.395-401, 2001.
DOI : 10.1023/A:1015134427592

E. Vapaavuori, T. Oksanen, and J. K. Holopainen, Open- Top Chamber Fumigation of Cloned Silver Birch (Betula Pendula Roth) Trees to Elevated CO2 and Ozone: Description of the Fumigation System and the Experimental Site The Finnish Forest Research Institute, Research Papers, vol.838, p.28, 2002.

G. Wallin, S. Linder, A. Lindroth, M. Räntfors, S. Flemberg et al., Carbon dioxide exchange in Norway spruce at the shoot, tree and ecosystem scale, Tree Physiology, vol.21, issue.12-13, pp.969-976, 2001.
DOI : 10.1093/treephys/21.12-13.969

D. Whitehead, K. P. Hogan, G. N. Rogers, J. N. Byers, J. E. Hunt et al., Performance of Large Open-Top Chambers for Long-Term Field Investigations of Tree Response to Elevated Carbon Dioxide Concentration, Journal of Biogeography, vol.22, issue.2/3, pp.307-313, 1995.
DOI : 10.2307/2845925

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