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Titolo:
Suppression of peatland methane emission by cumulative sulfate deposition in simulated acid rain
Autore:
Dise, NB; Verry, ES;
Indirizzi:
Open Univ, Dept Earth Sci, Milton Keynes MK7 6AA, Bucks, England Open Univ Milton Keynes Bucks England MK7 6AA nes MK7 6AA, Bucks, England US Forest Serv, USDA, N Cent Forest Expt Stn, Grand Rapids, MN 55744 USA US Forest Serv Grand Rapids MN USA 55744 Stn, Grand Rapids, MN 55744 USA
Titolo Testata:
BIOGEOCHEMISTRY
fascicolo: 2, volume: 53, anno: 2001,
pagine: 143 - 160
SICI:
0168-2563(200104)53:2<143:SOPMEB>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROGEN-FERTILIZATION; SEASONAL VARIABILITY; WETLAND ECOSYSTEMS; FOREST SOILS; DENITRIFICATION; INHIBITION; MINNESOTA; OXIDATION; UPLAND; OXIDE;
Keywords:
acid deposition; greenhouse effect; methane; sulfate; wetlands;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Dise, NB Open Univ, Dept Earth Sci, Walton Hall, Milton Keynes MK7 6AA, Bucks, England Open Univ Walton Hall Milton Keynes Bucks England MK7 6AA England
Citazione:
N.B. Dise e E.S. Verry, "Suppression of peatland methane emission by cumulative sulfate deposition in simulated acid rain", BIOGEOCHEMI, 53(2), 2001, pp. 143-160

Abstract

This field manipulation study tested the effect of weekly pulses of solutions of NH4NO3 and (NH4)(2)SO4 salts on the evolution of CH4 and N2O from peatland soils. Methane and nitrous oxide emission from a nutrient-poor fen in northern Minnesota USA was measured over a full growing season from plotsreceiving weekly additions of NH4NO3 or (NH4)(2)SO4. At this relatively pristine site, natural additions of N and S in precipitation occur at 8 and 5kg ha(-1) y(-1), respectively. Nine weekly additions of the dissolved salts were made to increase this to a total deposition of 31 kg N ha(-1) y(-1) on the NH4NO3-amended plots and 30 and 29 kg ha(-1) y(-1) of N and S, respectively, in the (NH4)(2)SO4-amended plots. Methane flux was measured weeklyfrom treatment and control plots and all data comparisons are made on plots measured on the same day. After the onset of the treatments, and over the course of the growing season, CH4 emission from the (NH4)(2)SO4-amended plots averaged 163 mg CH4 m(-2) d(-1), significantly lower than the same-day control plot mean of 259 mgCH4 m(-)2 d(-)1 (repeated measures ANOVA). Total CH4 flux from (NH4)(2)SO4treatment plots was one third lower than from control plots, at 11.7 and 17.1 g CH4 m(-2), respectively. Methane emission from the NH4NO3-amended plots (mean of 256 mg CH4 m(-2) d(-1)) was not significantly different from that of controls measured on the same day (mean of 225 mg CH4 m(-2) d(-1)). Total CH4 flux from NH4NO3 treatment plots and same-day controls was 16.9 and 15.1 g CH4 m(-)2, respectively. In general, stable, relatively warm and wet periods followed by environmental 'triggers' such as rainfall or changesin water table or atmospheric pressure, which produced a CH4 'pulse' in the other plots, produced no observable peak in CH4 emission from the (NH4)(2)SO4-amended plots. Nitrous oxide emission from all of the plots was below the detection limit over the course of the experiment.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 00:50:03