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|Title: ||Litter-fall causes nitrous oxide emissions|
|Author: ||Pal, Pranoy|
|Date: ||Aug-2012 |
|Publisher: ||Lincoln University. Department of Soil and Physical Sciences.|
|Citation: ||Pal, P. (2012) Litter-fall causes nitrous oxide emissions. Oral presentation at Where to from here - the new normal?, Post Graduate Conference, 28-29 August 2012, Lincoln University, New Zealand.|
|Item Type: ||Conference Contribution - Oral Presentation|
|Abstract: ||Our previous study showed that significant quantities of litter-fall (harvested but unconsumed
plant material dropped during grazing) can be deposited onto the soil surface during a grazing
event. However, the contribution of in situ decomposition of this litter-fall to nitrous oxide
(N₂O) emissions is unknown. We applied 15N-labelled ryegrass (Lolium perenne L.) to the
surface of a pastoral soil and for up to 139 days thereafter, quantified the contribution of
herbage decomposition to N₂O production and soil N dynamics in field conditions.
Approximately 70% of the total N₂O originated from the surface-applied litter treatment with
38–75% of the cumulative emissions occurring within 4–10 d of treatment application. After 66
d, dry matter loss from the litterbags equated to 46–82% of the pasture dry matter applied.
Emissions of N₂O likely resulted from ammonification followed by a coupling of nitrification
and denitrification during litter decomposition. The litter contributed to both the 15N enrichment
of the soil NO₃
⁻−N and N₂O–N pools. The emission factor (EF) of the in situ placed litter was
1.2%; similar to the IPCC default EF value of 1% for crop residues. Further in situ studies
using different pasture species and litter-fall rates are required to understand the microbial
processes responsible for litter-induced N₂O emissions.|
|Description: ||PowerPoint slides and Oral presentation at Lincoln University Postgraduate Conference 28-29 August 2012 : Where to from here – the new normal?|
|Persistent URL (URI): ||http://hdl.handle.net/10182/4921|
|Rights: ||Copyright © The Author.|
|Appears in Collections:||Department of Soil and Physical Sciences|
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