Jökull - 01.12.2006, Blaðsíða 31

The stable isotopic (C and N) composition of modern plants and lichens from northern Iceland
0 2 4 6 8-2-4-6-8-10 10-12
0-5-10-15-20-25-30-35-40-45-50
Terrestial C plants (-32 to -20)3
Phytoplankton (-42 to -26)
Organic fertilizer (2 to 30)
Animal guano (10 to 20)
C/N
Inorganic fertilizer (-4 to 4)
Plants fertilized by animal guanoPlants and lichens receiving N from ammonia
Soil (-10 to 15)
Precipitation (-15 to 15)
Glacier Bay, Alaska
-9 to 0.5
Average (3.7± 3.5)
TropicalTemperate
Average (-2.8±2.0)
(-8 to 0.5)
(-2 to 6)
Methanogenic (-110 to -60)
Aquatic macrophytes (-50 to -11)
Seagrass (-15 to -3)
Terrestial C4 plants ( -17 to -9)
Plankton (average -20)
CAM plant (-28 to -10)
Sediment mixture of aquatic and terrestrial plants (10 to 20)
Organic matter in lake composed
mainly of terristrial plants (>20)Plankton (~6)
Diatoms (5 to 8)
1
4, 8
8, 9,10,11,
3
2
4, 5
7
8
8
8
12
12
12
12
12
12
12
15
14
14
16
16
References
References
References
-9.3 to 1.0
Interior, Alaska
Belize Mangroves, central America
Upland, United Kingdom
6
12
P limited N limited
160 24 3220 284 8 12 36 40 44
5
A
B
C
13
Organic matter in lake composed
mainly of aquatic plants and
lacustrine algae
(4 to 10)
P
la
n
ts
ra
n
g
es
d
1
5
N
N
it
r o
g
en
s
o
u
rc
e
v
a
lu
es
d
1
5
N
d13C(‰, VPDB)
d15N(‰, air)
Figure 1. a) Nitrogen isotope variation in ecosystems; b) Carbon isotopic variation in ecosystems; c) C/N vari-
ations in ecosystems (An arrow end indicates a range greater than or less than the scale presented while a blunt
end indicates the minimum or maximum reported values) (References: 1 Hobbie et al., 1998; 2 Kielland et al.,
1998; 3 Martinelli et al., 1999; 4 Erskine et al., 1998; 5 Fogel et al., submitted; 6 McKee et al., 2002; 7 Jones et
al., 2004; 8 Kendall, 1998; 9 Garten, 1992; 10 Paerl and Fogel, 1994; 11 Fogg et al., 1998; 12 Boutton, 1991;
13 Keeley and Sandquist, 1992; 14 Herczeg et al., 2001; 15 Meyers, 1994; 16 Lamb et al., 2004). – Yfirlit yfir
magn (a) köfnunarefnis (δ15N), (b)kolefnis (δ13C), og (c) hlutföll þeirra (C/N) í mismunandi vistkerfum.
JÖKULL No. 56 29