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Titolo:
Influence of atmospheric CO2 enrichment on methane consumption in a temperate forest soil
Autore:
Phillips, RL; Whalen, SC; Schlesinger, WH;
Indirizzi:
Univ N Carolina, Dept Environm Sci & Engn, Chapel Hill, NC 27599 USA Univ N Carolina Chapel Hill NC USA 27599 Engn, Chapel Hill, NC 27599 USA Duke Univ, Dept Biol, Durham, NC 27708 USA Duke Univ Durham NC USA 27708Duke Univ, Dept Biol, Durham, NC 27708 USA Univ Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA Univ Michigan Ann Arbor MI USA 48109 & Environm, Ann Arbor, MI 48109 USA
Titolo Testata:
GLOBAL CHANGE BIOLOGY
fascicolo: 5, volume: 7, anno: 2001,
pagine: 557 - 563
SICI:
1354-1013(200105)7:5<557:IOACEO>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARBON-DIOXIDE ENRICHMENT; ELEVATED CO2; NITROUS-OXIDE; OXIDATION; FLUXES; CH4; RESPONSES; GRASSLAND; N2O; STIMULATION;
Keywords:
CH4 flux; elevated CO2; forest soil; methane oxidation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Phillips, RL Univ N Carolina, Dept Environm Sci & Engn, Rosenau Hall CB 7400, Chapel Hill, NC 27599 USA Univ N Carolina Rosenau Hall CB 7400 Chapel Hill NC USA 27599
Citazione:
R.L. Phillips et al., "Influence of atmospheric CO2 enrichment on methane consumption in a temperate forest soil", GL CHANGE B, 7(5), 2001, pp. 557-563

Abstract

Rates of atmospheric CH4 consumption of soils in temperate forest were compared in plots continuously enriched with CO2 at 200 muL L-1 above ambient and in control plots exposed to the ambient atmosphere of 360 muL CO2 L-1. The purpose was to determine if ecosystem atmospheric CO2 enrichment would alter soil microbial CH4 consumption at the forest floor and if the effect Of CO2 would change with time or with environmental conditions. Reduced CH4consumption was observed in CO2-enriched plots relative to control plots on 46 out of 48 sampling dates, such that CO2-enriched plots showed annual reductions in CH4 consumption of 16% in 1998 and 30% in 1999. No significantdifferences were observed in soil moisture, temperature, pH, inorganic-N or rates of N-mineralization between CO2-enriched and control plots, indicating that differences in CH4 consumption between treatments were likely the result of changes in the composition or size of the CH4-oxidizing microbialcommunity. A repeated measures analysis of variance that included soil moisture, soil temperature (from 0 to 30 cm), and time as covariates indicatedthat the reduction of CH4 consumption under elevated CO2 was enhanced at higher soil temperatures. Additionally, the effect of elevated CO2 on CH4 consumption increased with time during the two-year study. Overall, these data suggest that rising atmospheric CO2 will reduce atmospheric CH4 consumption in temperate forests and that the effect will be greater in warmer climates. A 30% reduction in atmospheric CH4 consumption by temperate forest soils in response to rising atmospheric CO2 will result in a 10% reduction in the sink strength of temperate forest soils in the atmospheric CH4 budget and a positive feedback to the greenhouse effect.

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Documento generato il 19/09/20 alle ore 21:31:34