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

Table 7.17 C-emission from organic soils, Gg C y -1
.
Cropland, Gg C y -1
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
-602 -600 -601 -605 -614 -580 -590 -584 -595 -581 -582 -584 -569 -571
Grassland, Gg C y -1
-53 -52 -51 -48 -47 -50 -47 -41 -38 -39 -41 -42 -43 -43
Total organic soils -655 -652 -652 -653 -660 -631 -637 -624 -633 -620 -623 -626 -612 -614
7.3.2.5 Nitrous oxide from organic soils
N O from organic soils are reported under the agricultural sector (Chapter 6.4) In the next report-
2
ing this emission will be included in the LULUCF sector.
7.4 Grassland
The area with grassland is defined as the area with permanent grass given in the annual census
from Statistics Denmark (Table 7.8). In 2003 177,000 hectares is reported as permanent grassland.
Based on the GIS analysis it is concluded that 34,640 hectares are organic and the remaining grassland
is on mineral soils. For mineral soils the changes in C-stock are assumed to be zero. For the
organic soils an CO 2 -emission from drained areas with a water table below 30 cm is assumed. For
areas with a water table between 0 and 30 cm a built up of organic matter is assumed (Table 7.12).
In Table 7.17 the annual emissions are given. The emission from grassland is reduced from 53 Gg
CO 2 in 1990 to 43 Gg in 2003 due to a reduced area with permanent grass.
The submitted CRF emission from organic soils from Grassland (CRF Table 5.C) is included in the
emission from organic soils under Cropland (CRF Table 5.B) due to an error. The total emission is
however reported correctly. This has no influence on the total emission.
7.5 Wetland
Wetland includes land for peat extraction and re-established anthropogenic wetlands. Naturally
occurring wetlands are not included in the inventory.
7.5.1 Wetlands with peat extraction
The area with peat extraction in Denmark is rather small. In 1990 the open area was estimated to
1,067 hectares decreasing to 885 hectares in 2003. All areas are nutrient poor raised bogs. The emission
from the open area is calculated according to the standard approach for nutrient poor areas
with an emission factor of 0.5 t C ha -1 y -1 . Because the underlying default factor is mainly based on
Finish data, a higher emission factor than recommended is chosen. This is in accordance with the
difference in temperatures between Denmark and Finland (see Section 7.3) increased to 0.5 t C ha -1
y -1
. The nitrous oxide emission from peat land is estimated from the total N-turnover multiplied
with a standard emission factor of 1,25%. The C:N-ration in the peat is estimated to 36 in an analysis
from the Danish Plant Directorate (PDIR 2004). Hence the N O emission is estimated to 0.546 kg
2
N O per t C.
2
Table 7.18 Annual emission from the surface area where peat extraction takes place, Gg C y -1
Emission, Gg C y -1
Emission, Mg N2O y -1
and N O y 2 -1
.
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
0.533 0.535 0.535 0.531 0.528 0.527 0.524 0.524 0.522 0.442 0.442 0.442 0.442 0.442
0.29 0.29 0.29 0.29 0.29 0.29 0.29 0.29 0.29 0.29 0.24 0.24 0.24 0.24
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