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Interannual variation in nitrous oxide emissions from perennial ryegrass/white clover grassland used for dairy production.
LANIGAN, GARY; WILLIAMS, MICHAEL
Nitrous oxide (N2 O) emissions are subject to intra- and interannual variation due to changes in weather and management. This creates significant uncertainties when quantifying estimates of annual N2 O emissions from grazed grasslands. Despite these uncertainties, the majority of studies are short-term in nature (<1 year) and as a consequence, there is a lack of data on interannual variation in N2 O emissions. The objectives of this study were to (i) quantify annual N2 O emissions and (ii) assess the causes of interannual variation in emissions from grazed perennial ryegrass/white clover grassland. Nitrous oxide emissions were measured from fertilized and grazed perennial ryegrass/white clover grassland (WC) and from perennial ryegrass plots that were not grazed and did not receive N input (GB), over 4 years from 2008 to 2012 in Ireland (52?51'N, 08?21'W). The annual N2 O-N emissions (kg ha(-1); mean ? SE) ranged from 4.4 ? 0.2 to 34.4 ? 5.5 from WC and from 1.7 ? 0.8 to 6.3 ? 1.2 from GB. Interannual variation in N2 O emissions was attributed to differences in annual rainfall, monthly (December) soil temperatures and variation in N input. Such substantial interannual variation in N2 O emissions highlights the need for long-term studies of emissions from managed pastoral systems.
Keyword(s): freeze-thaw cycles
Publication Date:
2014
Type: Journal article
Peer-Reviewed: Yes
Institution: Trinity College Dublin
Citation(s): Burchill W, Li D, Lanigan GJ, Williams M, Humphreys J, Interannual variation in nitrous oxide emissions from perennial ryegrass/white clover grassland used for dairy production., Global change biology, 20, 10, 2014, 3137-46
First Indexed: 2016-01-08 05:10:53 Last Updated: 2018-08-24 06:59:27