TABLE XI11
Magnesium (kg per ha) in Plant and Soil Material i n Ecosystems
Trees
Pinus Pinua Pinua Pinus Pinua Pinua Pinua P i c a
Picea
Picea
Picea
Picea
sylveslris aylveatn's sylvestria sylvestris sylveattia nigra
nigra
abiea
abiea
dies
abies
abies
Location
England Scotland England England Scotland England Scotland England England England Sweden Sweden
Stand Number
3
4
5
6
7
10
11
12
18
19
20
21
Age of trees in years
23
33
47
55
64
46
48
20
47
47
52
58
Living plants
Tree layer
-
-
-
< 1
s }ti 8
Fruit
< 1
Leaves
8
Branches
10
7
8
Trunks
8
24
25
28
23
39
2:)
34
19
35
18
-
8
}14
10 7
}48
}20
}50
9 n
-
-
-
-
0
IJ
0
-
10
-
Understorey plants
< 1
< 1
12
5
On trees (branches)
2
Litter on ground (L, F and H)
17
31
9
31
-
15
-
23
27
19
227
300
328
Mineral soil (exchangeable)
__
Removed in harvested trunks
3
0
41
42
1
37
34
34
Total removed in tree trunks
Depth of sampling in mineral
-
-
-
-
-
-
-
-
20
4
-
Roots
16
13
Dead plant material
9
-
-
1
-
-
-
-
-
-
-
-
-
-
-
-
- 269
-
-
299
-
-
-
-
if clear felled
11
24
66
70
-
73
-
35
56
69
18
-
soil cm
-
-
70
-
-
70
-
60
70
70
-
-
Reference
A
B
C
A
D
C
D
C
C
C
E
E
For key to references see foot of Table XV.