Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Growth performance of Populus exposed to “Free Air Carbon dioxide Enrichment” during the first growing season in the POPFACE experiment. | Ann. For. Sci. 58 2001 819-828 INRA EDP Sciences 2001 819 Original article Growth performance of Populus exposed to Free Air Carbon dioxide Enrichment during the first growing season in the POPFACE experiment Carlo Calfapietraa Birgit Gielenb Maurizio Sabattia Paolo De Angelisa Giuseppe Scarascia-Mugnozza and Reinhart Ceulemansb aUniversità degli Studi della Tuscia Department of Forest Environment and Resources DISAFRI Via S. Camillo de Lellis 01100 Viterbo Italy bUniversity of Antwerpen UIA Department of Biology Universiteitsplein 1 2610 Wilrijk Belgium Received 2nd January 2001 accepted 6 July 2001 Abstract - Stem diameter total plant height and number of sylleptic branches of three poplar Populus genotypes were followed during the first growing season of a high density intensively cultured plantation in Central Italy both under ambient CO2 Control and under elevated atmospheric CO2 550 ppm using the FACE technique. The three poplar genotypes belonged to different species of Populus alba L. Populus nigra L. and Populus x euramericana Dode Guinier . All three genotypes responded by an enhanced growth performance but the extent of their response to the FACE treatment was different. A stem volume index was calculated considering the stem composed by a truncated cone in the lower part and by a cone in the upper part. At the end of the first growing season stem volume index was increased in the FACE treatment by 54 to 79 as compared to Control treatment depending on the genotype. This increased stem volume index was caused by an increase of basal stem diameter rather than by an enhancement of plant height. Number of sylleptic branches was stimulated by more than 35 in the P. nigra genotype. The results confirm the optimal performance of this new POPFACE experiment and show the positive response of this fast-growing tree species to elevated CO2 conditions at an ecosystem scale even if considering the genotypic differences. elevated CO2 FACE short-rotation intensive .
