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Titolo:
Elevated CO2 stimulates soil respiration in a FACE wheat field
Autore:
Pendall, E; Leavitt, SW; Brooks, T; Kimball, BA; Pinter, PJ; Wall, GW; LaMorte, RL; Wechsung, G; Wechsung, F; Adamsen, F; Matthias, AD; Thompson, TL;
Indirizzi:
Univ Arizona, Tree Ring Res Lab, Tucson, AZ 85721 USA Univ Arizona TucsonAZ USA 85721 Tree Ring Res Lab, Tucson, AZ 85721 USA USDA ARS, US Water Conservat Lab, Phoenix, AZ 85040 USA USDA ARS Phoenix AZ USA 85040 Water Conservat Lab, Phoenix, AZ 85040 USA Potsdam Inst Climate Impact Res, D-14412 Potsdam, Germany Potsdam Inst Climate Impact Res Potsdam Germany D-14412 Potsdam, Germany Univ Arizona, Dept Soil Water & Environm Sci, Tucson, AZ 85721 USA Univ Arizona Tucson AZ USA 85721 ter & Environm Sci, Tucson, AZ 85721 USA
Titolo Testata:
BASIC AND APPLIED ECOLOGY
fascicolo: 3, volume: 2, anno: 2001,
pagine: 193 - 201
SICI:
1439-1791(2001)2:3<193:ECSSRI>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARBON-DIOXIDE; ATMOSPHERIC CO2; ISOTOPIC COMPOSITION; ORGANIC-MATTER; ROOT; ENRICHMENT; DECOMPOSITION; TEMPERATURE; GRASSLANDS; FEEDBACK;
Keywords:
soil respiration; rhizosphere; Free-Air CO2 Enrichment; CO2 fertilization; C cycling; soil organic matter; stable isotopes; C-13/C-12;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Pendall, E Univ Colorado, INSTAAR, Campus Box 450, Boulder, CO 80309 USA Univ Colorado Campus Box 450 Boulder CO USA 80309 CO 80309 USA
Citazione:
E. Pendall et al., "Elevated CO2 stimulates soil respiration in a FACE wheat field", BASIC AP EC, 2(3), 2001, pp. 193-201

Abstract

Understanding the response of soil carbon (C) dynamics to higher atmospheric CO2 concentrations is critical for evaluating the potential for soil C sequestration on time scales of decades to centuries. Here, we report on changes in soil respiration under Free-Air CO2 Enrichment (FACE) where spring wheat was grown in an open field at two CO2 concentrations (ambient and ambient+200 pmol mol(-1)), under natural meteorological conditions. FACE increased soil respiration rates by 40-70% during the peak of wheat growth. On the FACE plots, stable C isotopic composition Of soil CO2 was used to partition the soil CO2 flux into C from rhizosphere respiration and decompositionof pre-existing C. Decomposition contributed 100% of the soil CO2 flux before crop growth commenced, and only 35-45% of the flux at the peak of the growing season. Decomposition rates were not correlated with soil temperature, but rhizosphere respiration rates were strongly correlated with green leaf area index.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 18:52:28