Beerling, D.J. and Woodward, F.I. 1996. In situ gas exchange responses of boreal vegetation to elevated CO2 and temperature: first season results. Global Ecology and Biogeography Letters 5: 117-127.

Fransson, P.M.A. and Johansson, E.M. 2010. Elevated CO2 and nitrogen influence exudation of soluble organic compounds by ectomycorrhizal root systems. FEMS Microbial Ecology 71: 186-196.

Heath, J., Ayres, E., Possell, M., Bardgett, R.D., Black, H.I.J., Grant, H., Ineson, P. and Kerstiens, G. 2005. Rising atmospheric CO2 reduces sequestration of root-derived soil carbon. Science 309: 1711-1713.

Jach, M.E. and Ceulemans, R. 2000. Effects of season, needle age and elevated atmospheric CO2 on photosynthesis in Scots pine (Pinus sylvestris L.). Tree Physiology 20: 145-157.

Janssens, I.A., Medlyn, B., Gielen, B., Laureysens, I., Jach, M.E., van Hove, D. and Ceulemans, R. 2005. Carbon budget of Pinus sylvestris saplings after four years of exposure to elevated atmospheric carbon dioxide concentration. Tree Physiology 25: 325-337.

Johansson, E.M., Fransson, P.M.A., Finlay, R.D. and van Hees, P.A.W. 2009. Quantitative analysis of soluble exudates produced by ectomycorrhizal roots as a response to ambient and elevated CO2. Soil Biology & Biochemistry 41: 1111-1116.

Kellomaki, S. and Wang, K.-Y. 1997. Photosynthetic responses of Scots pine to elevated CO2 and nitrogen supply: results of a branch-in-bag experiment. Tree Physiology 17: 231-240.

Kellomaki, S. and Wang, K.-Y. 1996. Photosynthetic responses to needle water potentials in Scots pine after a four-year exposure to elevated CO2 and temperature. Tree Physiology 16: 765-772.

Wang, K.-Y., Kellomaki, S., Li, C. and Zha, T. 2003. Light and water-use efficiencies of pine shoots exposed to elevated carbon dioxide and temperature. Annals of Botany 92: 53-64.

Zhou, Y.-M., Wang, C.-G., Han, S.-J., Cheng, X.-B., Li, M.-H., Fan, A.-N. and Wang, X.-X. 2011. Species-specific and needle age-related responses of photosynthesis in two Pinus species to long-term exposure to elevated CO2 concentration. Trees 25: 163-173.