Interaction of Climate Change and Acid Deposition - Climate Change Impacts on Freshwater Ecosystems - page 159

70

NO 3 concentrations

60

50

40

30

20

10

0

1850 1900 1950 2000 2050 2100

2800

Soil organic C pool

2600

2400

2200

2000

1850 1900 1950 2000 2050 2100

30

Soil C/N ratio

25

MPIA2 SL1 MPIA2 SL2

20

MPIB2 SL1 MPIB2 SL2

HCA2 SL1 HCA2 SL2

HCB2 SL2 HCB2 SL1

15

1850 1900 1950 2000 2050 2100

Figure 7.5 Projected NO 3 concentrations in streamwater at Øygard, Norway, under
four climate scenarios and two storylines (SL1 and SL2) of plant processes. The MAGIC
model was used. Also shown are soil C pool and C/N ratio of the soil organic matter.
(From Sjøeng et al . 2009b.)

Northern Italy is a hot spot with respect to increasing concentrations of NO 3
in streams and rivers. The trends indicate increasing degree of N saturation in
catchments of small and medium-sized rivers south of the Alps, but climate
variations also appear to play a significant role (Rogora 2007; Rogora &
Mosello 2007). The increase in NO 3 concentrations closely follows the pattern