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Titre du document / Document title

Interactive effects of fire, elevated carbon dioxide, nitrogen deposition, and precipitation on a California annual grassland

Auteur(s) / Author(s)

HENRY Hugh A. L. (1) ; CHIARIELLO Nona R. (2) ; VITOUSEK Peter M. (1) ; MOONEY Harold A. (1) ; FIELD Christopher B. (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Biological Sciences, Stanford University, Stanford, California 94305, ETATS-UNIS
(2) Jasper Ridge Biological Preserve, Stanford University, Stanford, California 94305, ETATS-UNIS
(3) Department of Global Ecology, Carnegie Institution, 260 Panama Street, Stanford, California 94305, ETATS-UNIS

Résumé / Abstract

Although it is widely accepted that elevated atmospheric carbon dioxide (CO2), nitrogen (N) deposition, and climate change will alter ecosystem productivity and function in the coming decades, the combined effects of these environmental changes may be nonadditive, and their interactions may be altered by disturbances, such as fire. We examined the influence of a summer wildfire on the interactive effects of elevated CO2, N deposition, and increased precipitation in a full-factorial experiment conducted in a California annual grassland. In unburned plots, primary production was suppressed under elevated CO2. Burning alone did not significantly affect production, but it increased total production in combination with nitrate additions and removed the suppressive effect of elevated CO2. Increased production in response to nitrate in burned plots occurred as a result of the enhanced aboveground production of annual grasses and forbs, whereas the removal of the suppressive effect of elevated CO2 occurred as a result of increased aboveground forb production in burned, CO2-treated plots and decreased root production in burned plots under ambient CO2.The tissue nitrogen-phosphorus ratio, 'which was assessed for annual grass shoots, decreased with burning and increased with nitrate addition. Burning removed surface litter from plots, resulting in an increase in maximum daily soil temperatures and a decrease in soil moisture both early and late in the growing season. Measures of vegetation greenness, based on canopy spectral reflectance, showed that plants in burned plots grew rapidly early in the season but senesced early. Overall, these results indicate that fire can alter the effects of elevated CO2 and N addition on productivity in the short term, possibly by promoting increased phosphorus availability.

Revue / Journal Title

Ecosystems    ISSN  1432-9840 

Source / Source

2006, vol. 9, no7, pp. 1066-1075 [10 page(s) (article)] (1 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

Springer, New York, NY, ETATS-UNIS  (1998) (Revue)

Mots-clés anglais / English Keywords

America

;

North America

;

United States

;

Nitrogen dioxide

;

Carbon dioxide

;

Ecosystem

;

Global change

;

Planetary scale

;

Fire

;

Perturbation

;

Climate modification

;

Grassland

;

California

;

Precipitation

;

Atmospheric fallout

;

Fire effect

;

Mots-clés français / French Keywords

Amérique

;

Amérique du Nord

;

Etats Unis

;

Azote dioxyde

;

Carbone dioxyde

;

Ecosystème

;

Changement global

;

Echelle planétaire

;

Incendie

;

Perturbation

;

Modification climat

;

Prairie

;

Californie

;

Précipitation

;

Retombée atmosphérique

;

Action feu

;

Mots-clés espagnols / Spanish Keywords

America

;

America del norte

;

Estados Unidos

;

Nitrógeno dióxido

;

Carbono dióxido

;

Ecosistema

;

Cambio global

;

Escala planetaria

;

Incendio

;

Perturbación

;

Modificación clima

;

Pradera

;

California

;

Precipitación

;

Recaída atmosférica

;

Acción fuego

;

Mots-clés d'auteur / Author Keywords

carbon dioxide

;

climate change

;

disturbance

;

fire

;

global change

;

nitrogen

;

grassland

;

California

;

Localisation / Location

INIST-CNRS, Cote INIST : 26787, 35400014514229.0030

Nº notice refdoc (ud4) : 18364060



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