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Area affected by windthrow
19.11.2004, Slovakia19.11.2004, Slovakia2.5 wide, 50km long strip of spruce forest2.5 wide, 50km long strip of spruce forestWind velocity 160Wind velocity 160‐‐200km/h200km/h
Tatra mountains, Slovakia
19151915
20042004
Site characteristics
Locality Soil type Soil skeleton Proportion of skeleton Water regime
Koprová Humic podzol boulder 65% well drained Podbanské Cambic podzol stony 45% well drained Smokovec Haplic cambisol moderately stony 25% well drained Kežmarské Stagnic pseudogley stony 40% water-logged
Stem volume measurement
47 wind‐uprooted spruce trees were randomly selected for stem and below‐ground parts measurementsbranches were cut off from the stem and the tree height and DBH was measured. the diameter measurement was also taken each 100 cm from the tree base to the top.
Coarse root sampling (<1cm)
Coarse root sampling
Root/shoot ratio
Root/shoot ratio
Stand 1 Stand 2 Stand 3 Stand 40.0
0.1
0.2
0.3
0.4
0.5
Stand 2 vs. Stand 4; P=0.045
Stump biomass as % of total belowground biomass
Stump biomass / belowgroud biomass
Koprova
dolina
Nad Podban
skym
Stary S
mokove
cKez
marske
zlab
y
0.0
0.1
0.2
0.3
0.4
Belowground stump volume / stem volume
1 2 3 40.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
Stand 2 vs. Stand 4; P=0.821
Coarse root volume / stem volume
1 2 3 40.0
0.1
0.2
0.3
0.4
0.5
0.6
Stand 2 vs. Stand 4; P=0.025
Belowground volume ‐
DBH
0 20 40 600.0
0.1
0.2
0.3
0.4
0.5Kôprová
Podbanské
Smokovec
Kezmarské
DBH [cm]
Ro
ots
+ s
tum
p v
olu
me
[m
3]
Stand 2 vs. Stand 4; P=0.002
Belowground volume – stem volume
0.0 0.5 1.0 1.5 2.00.0
0.1
0.2
0.3
0.4
0.5Kôprová
Podbanské
Smokovec
Kezmarské
Stem volume [m3]
Ro
ots
+ s
tum
p v
olu
me
[m
3]
Stand 2 vs. Stand 4; P=0.008
Proportion of coarse root at different depths
Stone content: 1‐ 65%, 2‐ 45%, 3‐ 25%
Conclusions
soil waterlogging results in predomination of roots at the expense of shootsit is possible to construct reliable models predicting belowground biomass, soil water affects biomass allocation predictionmodel parameters have to be site specific, especially if they are to be applied to sites with contrasting soil water conditions.
Acknowledgements
