EUROFACE Poplar Plantation (Populus x euramericana, P. alba, P. nigra)
Liberloo, M., Tulva, I., Raim, O., Kull, O. and Ceulemans, R. 2007. Photosynthetic stimulation under long-term CO2 enrichment and fertilization is sustained across a closed Populus canopy profile (EUROFACE). New Phytologist 173: 537-549.