Table 1. Basic characteristics of the forest stands.
Month of measurement GPS Forest age Number of trees Height of tomographic measurement
September 49°18´N, 16°46´E 100 15 130 cm
October 49°19´N, 16°45´E 110 12 60 cm
1

Fig. 1. A tomogram (Ωm) of a healthy individual (September, n. 9) displayed in GIS, when points replace the raster image. There is a clearly visible green transitional boundary between heartwood and sapwood.

Table 2. Decay quantification and description. While sapwood proportion was found from tomograms, the remaining characteristics, i.e. decay proportion, relative cavity area and decay description, were obtained from radial cuts.
Tree ID Diameter (cm) Sapwood propotion (%) Decay propotion (%) Relative cavity area (%) Overall EIT
and real cut 		Decay description
1 123 33.7 - - - -
2 122 33.1 - - - -
5 169 37.5 - - - -
6 132 32.3 - - - -
9 153 33.3 - - - -
11 147 36.0 - - - -
4B 137 38.1 - - - -
13 146 36.7 - - - -
2B 218 34.1 4.8 - Fully 2IR, 1RDS+M
10B 174 31.9 6.7 - Fully 3IR
3B 188 42.1 7.5 - Fully 1IR, 1RDS+M
12B 179 30.3 8.5 - Fully 4IR
8B 194 36.8 9.5 - Partially 2VR+M
3 131 35.4 10.5 - Partially 2IR, 1VR
15 177 36.4 11.9 - Significantly 3IR, 1RDS+M
1B 188 43.9 13.7 - Significantly 7IR, 2VR
7 160 41.7 17.9 - Significantly 1RDS
7B 157 28.0 18.6 1.9 Partially 1VR, 1RDS+M
11B 132 33.7 22.6 - Significantly 4IR, 1VR+M
14 140 37.5 22.8 - Significantly 3IR, 2VR, 1RDS+M
8 118 38.7 32.4 - Significantly 1IR, 1RDS
12 178 19.2 35.2 - Partially 4VR+M, 3RDS+M
6B 220 23.1 43 6.3 Significantly 2VR, 1RDS+M
5B 173 24.8 46.4 2.1 Fully 3RDS+M
10 173 19.8 47 - Significantly 1RDS+M
4 128 20.4 74.4 - Significantly 1RDS
9B 180 19.3 85.4 unknown Significantly 1RDS
nIR = Incipient rot (early stages)
nVR = Visible rot (without destroying the wood structure)
nRDS = Advanced rot destroying the wood structure
n = The number of occurrences (spots) of rot
+M = Mycelium
2

Fig. 2. Relation between a sapwood proportion found through tomography measurements and a decay proportion identified on the radial cut implemented on the site of tomography measurements.

3

Fig. 3. Cuts with overlapping tomograms being sorted as per decay proportion in the real cut. Present are also three exceptions (1B, 3B, 7B) as described in Section 3.3. Due to the cavity filling deliberately falling out during the felling, the cavity presence and extent could not be determined during the tomography measurement.

4

Fig. 4. Electrical resistance values split into heartwood and sapwood data. Sorted by decay proportion (as measured on radial cuts). The central rectangle spans the first quartile (Q1-25%) to the third quartile (Q3-75%). A segment inside the rectangle shows the median and “whiskers” above and below the box show the locations of the minimum and maximum (1%).