Ulrich Dmmgen UN ECE Task Force on Emission Inventories and Projections Agriculture and Nature Panel

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Indirect emissions from agricultural soils
GAS-EM (Germany)
Ulrich DämmgenUN ECE Task Force on Emission
Inventories and Projections,Agriculture and
Nature PanelFederal Agricultural Research
Centre , Institute of Agroecology, Braunschweig,
Germany
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Indirect emissions - GAS-EM
The translation of the title How does Germany
treat indirect emissions within GAS-EM? GAS-EM
is the German model/method to calculate GASeous
EMissions from agriculture.
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Indirect emissions - GAS-EM
GAS-EM (1) GAS-EM was primarily developed to
assess NH3 emissions. Therefore it is closely
related to the structure of the EMEP/CORINAIR
Atmospheric emission inventory guidebook. It is
now a general calculation tool to address all
emissions from all relevant agricultural sources,
i.e. from soils, plants, and from animal
husbandry.
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Indirect emissions - GAS-EM
GAS-EM (2) GAS-EM is a mass flow model (wherever
possible). GAS-EM tries to substitute factors by
functions (of performance, feed, ...). GAS-EM
tries to deal with sources as an entity. (A
dairy cow is neither an IPCC nor a LRTAP cow
....) GAS-EM makes use of national information
(wherever possible).
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Indirect emissions - GAS-EM
Treatment of indirect emissions in GAS-EM
(1) Indirect emissions arise from
(1) depositions of reactive nitrogen matter
originating from agricultural sources (NH3 and
NO), (2) nitrogen returned to soil which is
liable to leaching and run-off. GAS-EM tries to
quantify in particular NH3 and NO losses from all
relevant sources anddoes not use default factors
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Indirect emissions - GAS-EM
Treatment of indirect emissions in GAS-EM
(2) GAS-EM tries to quantify - NH3 and NO
emissions from (mineral) fertilizer application,
legumes and manure management according to the
AEIG. The IPCC Guidelines do not give a good
estimate of the amount of N released from mineral
fertilizers (2 to 10 ). They give a rough
estimate of both animal N excretions as well as N
losses during housing, storage and spreading.
(Why are other sources not contributing to
indirect emissions?)
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Indirect emissions - GAS-EM
The old fashioned approach
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The Agriculture and Nature Panel
The general approach
Carbon and nitrogen flows are traced through the
whole system as C and VS as well as Ntotal and
TAN.
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Indirect emissions - GAS-EM
Importance of accuracy and mass flow
Dairy cow, 8000 l a-1 milk, slurry A and B IPCC
default C German emission D loose housing,
open tank E tied housing, solid cover Savings
are partly ruined.
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Indirect emissions - GAS-EM
Importance of comprehensive treatment of emissions
dairy cow, 8000 l a-1 milk, tied system, straw
based, normal heap, broad cast short vegetation.
(left NH3 considered right all N species
considered)
N emitted (left) 34.5 kg (right) 36.8 kg
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Indirect emissions - GAS-EM
Steps in trouble shooting - apply both IPCC
Guidelines and AEIG - develop better
understanding in particular of NO and N2
emissions from housing and storage
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