Agriculture Reference
In-Depth Information
Table 1
.
Vegetation and site characteristics of two stratum in Creux du Van. Radial
growth was analysed as the sum of tree ring growth over the past 50 years, 1952 to 2001.
The standard deviation is indicated in brackets
Creux du Van
Stratum
I
II
Altitude (m a.s.l.)
1220
1190
Slope (°)
29
25
Vegetation
“Dwarf” spruce
Vaccinium myrtillus
Sphagnum
quinquefarium
Sphagnum acutifolium
“Reference spruce“
Sorbus aucuparia
Vaccinium myrtillus
Mean high ( spruce) (m)
3
25
Radial growth (spruce) (cm 50
year
-1
)
3.0 (0.9)
17.2 (28.5)
Age (spruce) (year)
87.6 (24.5)
124.3 (5.2)
Table 2. Main chemical-physical characteristics of the soil
Profile
I
II
Horizon
OL
OF
OH
OL
OF
OH
Humidity %
nd
nd
75
nd
nd
60
Depth cm
5
10
25
10
30
75
pH
H2O
4.3
4.3
7.2
4.2
4.2
6.4
Bulk density gcm
-3
nd
0.1
0.2
nd
0.2
0.2
Electrical conductivity μScm
-1
279
59
74.6
102.9
102.9
101.5
CaCO
3
%
0.0
0.0
2.6
0.0
0.0
3.3
C-CaCO
3
%
0.0
0.0
0.3
0.0
0.0
0.4
C
org
g kg
-1
450
442
379
458
423
347
N
tot
g kg
-1
12.8
12.7
16.0
16.0
14.2
12.0
C/N
35
35
24
29
30
29
Ptot mgkg
-1
nd
160
170
nd
250
223
