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Titolo:
Establishing a grassland signature in veins: O-18 in the leaf water of C-3and C-4 grasses
Autore:
Helliker, BR; Ehleringer, JR;
Indirizzi:
Univ Utah, Dept Biol, Stable Isotope Ratio Facil Environm Res, Salt Lake City, UT 84112 USA Univ Utah Salt Lake City UT USA 84112 m Res, Salt Lake City, UT 84112 USA
Titolo Testata:
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
fascicolo: 14, volume: 97, anno: 2000,
pagine: 7894 - 7898
SICI:
0027-8424(20000705)97:14<7894:EAGSIV>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYDROGEN ISOTOPE COMPOSITION; ATMOSPHERIC CO2; STABLE OXYGEN; ENRICHMENT; LEAVES; DISCRIMINATION; DELTA-O-18; PLANTS; MODEL; C3;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Helliker, BR Univ Utah, Dept Biol, Stable Isotope Ratio Facil Environm Res, 257 S 1400 E, Salt Lake City, UT 84112 USA Univ Utah 257 S 1400 E Salt Lake City UT USA 84112 84112 USA
Citazione:
B.R. Helliker e J.R. Ehleringer, "Establishing a grassland signature in veins: O-18 in the leaf water of C-3and C-4 grasses", P NAS US, 97(14), 2000, pp. 7894-7898

Abstract

We show that O-18 evaporative enrichment of bulk leaf water in grass species can be significantly more enriched than predicted by the Craig-Cordon model, with C-4 grasses considerably more enriched than Cs grasses. Our results suggest that the unanticipated O-18 leaf water enrichment of grasses is attributable to the progressive evaporative enrichment along parallel veins(a function of both leaf length and interveinal distance), a pattern that does not occur in Dicotyledonous species. We propose that the differential O-18 enrichment of grasses will result in distinct (COO)-O-18-O-16 biospheric signals from grassland and forest ecosystems, allowing for further partitioning of terrestrial carbon fluxes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 04:30:16