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Do above‐ground growth dynamics of poplar change with time under CO 2 enrichment?
Author(s) -
Calfapietra Carlo,
Gielen Birgit,
Sabatti Maurizio,
De Angelis Paolo,
Miglietta Franco,
ScarasciaMugnozza Giuseppe,
Ceulemans Reinhart
Publication year - 2003
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.2003.00899.x
Subject(s) - phenology , canopy , competition (biology) , leaf area index , biology , botany , horticulture , zoology , agronomy , ecology
Summary• In a free‐air CO 2 enrichment (FACE) study, above‐ground growth of Populus alba , Populus nigra and Populus × euramericana was followed continuously during the first rotation cycle of a short rotation culture (SRC) plantation to test possible changes in the response to elevated CO 2 occurring from planting until canopy closure. • Height, stem basal area, stem volume index, branch production, and bud phenology were monitored for 3 yr. Moreover the coefficient of variation and a competition index were calculated to analyse the onset and the typology of competition. • Volume index was higher under elevated CO 2 by 77%, 24% and 22%, as mean value for the three species, in the first, second and third years, respectively. The stimulating response, although univocal, differed in extent among species. Branch production was stimulated only in the first year, whereas bud phenology was unaffected. • The analysis of these results show that growth was stimulated by elevated CO 2 only in the first year, although differences in volume index remained significant even in the second and third years. In the third year, under canopy closure, only competitively advantaged individuals profited by the FACE treatment.