TABLE XVI
Annual Uptake, Retention and Release of Nutrienk by the Trees of Woodland Ecosystem
kg per ha
~
Spruce on podsol soil
U.S.S.R.
Spruce on rich soil
U.S.S.R.
Birch
U.S.S.R.
Mixed oakwood
U.S.S.R..
Nothofagus truneata
New Zealand
Uptake
Retained
Released by litter fall
Uptake
Retained
Released by litter fall
Uptake
Retained
Released by litter fall
Uptake
Retained
Released by litter fall
Uptake
Retained
Released by litter fall
Chemical Elements (kg per ha)
K
Ca
M g
P
N
Reference
18
56
9
3.2
6
8
2
0.6
12
48
7
2.6
20
52
3
6
17
46
30
107
17
53
13
54
85
102
23
16
62
86
7
1
6
29
10
19
16
3
13
2.7
0.3
2.4
11
6
5
7
4
3
34
84
12
3.3
4
10
1
0.7
30
74
11 2.6
61
Sonn, 1960
9
52
62
Sonn, 1960
8
54
11 1
45
66
92
Mina, 1955
33
59
Smirnova and Gorodentseva, 1958
40
Miller, in manuscript
3
37