Denmark's National Inventory Report 2005 - Submitted under the ...

The emission/sink from mineral soils are not reported this year, but will be reported from next
year.
The carbon dioxide emission factor from the organic soils is based on emission data from Denmark,
UK, Sweden, Finland and Germany, adjusted for differences in annual mean temperature to
the average Danish climate (Svend E. Olesen, DIAS, 2005). E.g. data from southern Finland are
adjusted with a factor of 2 and data from central Germany with a factor of 0.6.
The emission factors for organic soils are shown in Table 7.12 Negative values indicates a built up
of organic matter. Wet organic soils are defined as having a water table between 0 and 30 centimetres.
Table 7.12 Emission factors for organic soils. Negative values indicates a built up.
Emissions of nitrous oxide from organic soils are estimated from degradation of organic matter
and the C:N-ratio in the organic matter. Figure 7.3 shows the C:N-ratio for 160 different soils.
Hence for organic soils are used a C:N-ratio of 20. As emission factor is used the IPCC Tier 1 value
of 1.25%.
178
% organic
soils 1
% with deep
organic soils
% wet soils
Dry
shallow
Emission factor, t C ha -1 y -1
Dry
deep
Wet
shallow
Annual crops 3.8 38 0 5 8 0 0
Grass in rotation 11.2 38 0 5 8 0 0
Set-a-side 10.4 38 26 3 4 -0.5 -0.5
Permanent grass (drained) 19.5 38 26 3 4 -0.5 -0.5
1 Percentage of the total area from the annual survey from Statistics Denmark classified as organic
65,00
60,00
55,00
50,00
45,00
40,00
35,00
30,00
25,00
20,00
15,00
10,00
y = 0,3575x + 15,448
5,00
0,00
Organiske jorde
Spagnumarealer
0 5 10 15 20 25 30 35 40 45 50 55 60 65
Figure 7.3 C:N-ratio in organic soils in relation to soil carbon content (Olesen 2004)
ÈÃ
Wet
deep