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Titolo:
Elevated [CO2] and nutrient status modified leaf phenology and growth rhythm of young Populus trichocarpa trees in a 3-year field study
Autore:
Sigurdsson, BD;
Indirizzi:
Swedish Univ Agr Sci, Dept Prod Ecol, Uppsala, Sweden Swedish Univ Agr Sci Uppsala Sweden ci, Dept Prod Ecol, Uppsala, Sweden
Titolo Testata:
TREES-STRUCTURE AND FUNCTION
fascicolo: 7, volume: 15, anno: 2001,
pagine: 403 - 413
SICI:
0931-1890(200110)15:7<403:E[ANSM>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARBON-DIOXIDE CONCENTRATION; SPRUCE PICEA-SITCHENSIS; ATMOSPHERIC CO2; PHENOTYPIC PLASTICITY; BLACK COTTONWOOD; CLIMATIC-CHANGE; PLANT-GROWTH; FROST DAMAGE; RESPONSES; NITROGEN;
Keywords:
bud set; growth phenology; leaf senescence; nitrogen; shoot extension;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Sigurdsson, BD Iceland Forest Res, IS-113 Reykjavik, Iceland Iceland Forest Res Reykjavik Iceland IS-113 avik, Iceland
Citazione:
B.D. Sigurdsson, "Elevated [CO2] and nutrient status modified leaf phenology and growth rhythm of young Populus trichocarpa trees in a 3-year field study", TREES, 15(7), 2001, pp. 403-413

Abstract

'Young individuals of a single clone of black cottonwood, in Iceland, wereexposed for 3 years to elevated atmospheric CO2 concentrations [CO2] in whole-tree chambers at natural and high nutrient availability. No treatment effects were found at bud break or the start of shoot extension in spring. Autumn phenology was, however, affected both by elevated [CO2] and changes in nutrient status. The time of annual growth cessation was linearly relatedto leaf nitrogen concentration, irrespective Of CO2 treatment. At low (natural) nutrient availability, elevated [CO2] accelerated growth cessation and bud set, which reduced the period of active growth. An earlier and more pronounced leaf senescence and corresponding loss of photosynthetic capacityfurther decreased carbon acquisition in elevated [CO2]. The negative [CO2]effect on duration of shoot extension and leaf senescence existed, but wasnot as pronounced, when trees grew at higher nutrient availability. Improved nutrient availability extended the shoot extension period and delayed leaf senescence. It is suggested that trees grown in elevated [CO2] altered their autumn phenology as an effect of a signal similar to that in trees growing at low nutrient availability, i.e. an imbalance between carbon and nitrogen sources. These alterations in autumn phenology may be important when predicting how trees will grow in a future CO2 environment.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 12:36:27