Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
CARBON-ISOTOPE DISCRIMINATION AND STOMATAL RESPONSES OF MATURE PINUS-SYLVESTRIS L TREES EXPOSED IN-SITU FOR 3 YEARS TO ELEVATED CO2 AND TEMPERATURE
Autore:
BEERLING DJ;
Indirizzi:
UNIV SHEFFIELD,DEPT ANIM & PLANT SCI SHEFFIELD S10 2TN S YORKSHIRE ENGLAND
Titolo Testata:
Acta oecologica
fascicolo: 6, volume: 18, anno: 1997,
pagine: 697 - 712
SICI:
1146-609X(1997)18:6<697:CDASRO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
WATER-USE EFFICIENCY; GAS-EXCHANGE RESPONSES; LAST 3 CENTURIES; SCOTS PINE; BOREAL VEGETATION; 4-YEAR EXPOSURE; WHOLE-CATCHMENT; C-3 PLANTS; DENSITY; ENRICHMENT;
Keywords:
CARBON ISOTOPE RATIOS; CLIMATE CHANGE; CO2; PHOTOSYNTHESIS; PINUS SYLVESTRIS; STOMATA; WATER USE EFFICIENCY;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
D.J. Beerling, "CARBON-ISOTOPE DISCRIMINATION AND STOMATAL RESPONSES OF MATURE PINUS-SYLVESTRIS L TREES EXPOSED IN-SITU FOR 3 YEARS TO ELEVATED CO2 AND TEMPERATURE", Acta oecologica, 18(6), 1997, pp. 697-712

Abstract

The Climate Change Experiment (CLIMEX) is a unique large scale facility in which an entire undisturbed catchment of boreal vegetation has been exposed to elevated CO2 (560 ppm) and temperature (+3 degrees C summer, +5 degrees C winter) for the past three years with all the soil-plant-atmosphere linkages intact. Here, carbon isotope composition endstomatal density have been analysed from sequential year classes of needles of mature Scots pine trees (Pinus sylvestris L.) to investigatethe response of time-integrated water-use efficiency (WUE) and stomatal density to CO2 enrichment and climate change. Cal bon isotope discrimination decreased and WUE increased in cohorts of needles developingunder increased CO2 and temperature, compared to needles on the same trees developing in pretreatment years. Mid-season instantaneous gas exchange, measured on the same trees for the past four pears, indicatedthat these responses resulted from higher needle photosynthetic ratesand reduced stomatal conductance. Needles of P. sylvestris developingunder increased CO2 and temperature had consistently lower stomatal densities than their ambient grown counterparts on the same trees. The stomatal density of P. sylvestris needles was inversely correlated with delta(13)C-derived WUE, implying some effect of this morphological response on leaf gas exchange. Future atmospheric CO2 and temperature increases are therefore likely to improve the water economy of P. sylvestris, at least at the scale of individual needles, by affecting stomatal density and gas exchange processes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 07:15:39