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Titolo:
Emission of ammonia (NH3), nitrous oxide (N2O) and methane (CH4) from a dairy hardstanding in the UK
Autore:
Ellis, S; Webb, J; Misselbrook, T; Chadwick, D;
Indirizzi:
ADAS Boxworth, Cambridge CB3 8NN, England ADAS Boxworth Cambridge England CB3 8NN orth, Cambridge CB3 8NN, England ADAS Wolverhampton, Wolverhampton WV6 8TQ, W Midlands, England ADAS Wolverhampton Wolverhampton W Midlands England WV6 8TQ ands, England IGER, Okehampton EX20 2SB, Devon, England IGER Okehampton Devon England EX20 2SB kehampton EX20 2SB, Devon, England
Titolo Testata:
NUTRIENT CYCLING IN AGROECOSYSTEMS
fascicolo: 1-3, volume: 60, anno: 2001,
pagine: 115 - 122
SICI:
1385-1314(2001)60:1-3<115:EOA(NO>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
GRASSLAND; MANURE;
Keywords:
concrete hardstandings; gaseous emissions;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Ellis, S UK MAFF, Room 137,Nobel House,17 Smith Sq, London SW1P 3JR, England UK MAFF Room 137,Nobel House,17 Smith Sq London England SW1P 3JR
Citazione:
S. Ellis et al., "Emission of ammonia (NH3), nitrous oxide (N2O) and methane (CH4) from a dairy hardstanding in the UK", NUTR CYCL A, 60(1-3), 2001, pp. 115-122

Abstract

Emissions of ammonia (NH3), nitrous oxide (N2O) and methane (CH4) from uncovered yard areas (hardstandings) of a UK dairy farm were measured between October 1997 and August 1999. Measurements were concentrated after morning milking when the yard had been scraped, and at positions accounting for differences in slurry coverage and manure type. Over two seasons, the mean NH3emission from a number of season and position categories on the hardstanding were 0.27 g N m(-2) h(-1) in winter and spring, 0.45 g N m(-2) h(-1) in summer when the feeding/loafing area was not included, increasing to 1.51 gN m(-2) h(-1) when this area was included, and 5.0 g N m(-2) h(-1) for thefeeding/loafing area alone. The feeding/loafing area was close to the slurry lagoon where excreta were continuously deposited and not scraped to the slurry lagoon, as was the rest of the hardstanding. A diurnal study of emissions in the summer showed a marked decrease with time after the yard was scraped following the first milking, with emissions increasing again after evening milking when fresh excreta were deposited. Nitrous oxide emissions were more variable than NH3, with an order of magnitude difference between lowest and highest emissions measured at the same time. Mean N2O emission rates were 3.3 mug N m(-2) h(-1) in winter and spring, 6.5 mug N m(-2) h(-1) in summer when the feeding/loafing area was not included, increasing to 7.8mug N m(-2) h(-1) when this area was included, and 17.9 mug N m(-2) h(-1) for the feeding/loafing area alone. Large mean methane emissions were measured, 185 mg C m(-2) h(-1) in winter and spring, decreasing to 57.3 mg C m(-2) h(-1) in summer when the feeding/loafing area was not included, increasing to 72.9 mg C m(-2) h(-1) when this area was included, and 151.2 mg C m(-2) h(-1) for the feeding/loafing area alone. Therefore in summer, emissionsmeasured directly from a dung pat [0-5 cm] that had not been scraped from the loafing area were much greater than from scraped hardstanding areas, but in winter there were still significant emissions from the remaining slurry post-scraping. The experimental design was not sufficient to elucidate the physico-chemical variables controlling the measured emissions, but the data were put into context by estimating the annual emission of these pollutant gases from this one dairy farm. These were estimated at 0.43 t NH3-N y(-1), 0.3 kg N2O-N y(-1) and 1.0 kg CH4-C y(-1). Therefore, uncovered farmyard areas that regularly have excreta deposited on them are significant but previously unaccounted for sources of NH3 loss, less so for N2O and CH4, andrequire further study to assess the significance of these emission sourceswithin the UK and worldwide.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 09:42:34