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Table 1 Conversion and expansion factors for different tree compartments.

From: Options for accounting carbon sequestration in German forests

species group
spruce fir pine douglas larch beech oak short rotation broadleaves Long rotation broadleaves
Density by volume [t/m3][12]
0.3788 0.3629 0.4307 0.4141 0.4873 0.5583 0.5707 0.4618 0.5642
Mean sw/cw-ratio[15]
0.1453 0.2847 0.1541 0.1050 0.0957 0.1929 0.2091 0.1902 0.1929*
Mean needle/cw-ratio[15]
0.0987 0.0987** 0.0871 0.0463 - - - - -
  1. *Since no separate value for long rotation broadleaves is available, the value for beech is assumed.
  2. **Since no separate value for fir is available, the value for spruce is assumed.
  3. sw = small wood (diameter < 7 cm), cw = coarse wood (diameter ≥ 7 cm)