300
Anna Avila
Table 21.1. Atmo pheric input concentration in wet depo ition (lIeq L- I ) and multiplicative coefficient • for total deposition applied to Mont eny and Prade
Montseny
Prades
Tota1
Total
Wet deposition
depo ition
Wet deposition
depo it ion
Variable
1845
1985
coefficient
1845
1985
coefficient
Cal<
30.0
60.0
1.5
47.4 47.4
1.6
Mg 2 •
.0
11.0
1.5
8.2
.2
1.3
a'
24.0
24.0
1.5
20.4 20.4
I.3
K'
0.5
4.0
1.5
5.9
5.9
1.3
H.'
2.0
25.0
1.5
0.0 25.5
1.1
0,2.0
20.0
1.5
0.0 15.9
1.1
0/10.0
51.0
1.9
21.1 54.2
1.2
cr
27.8
29.0
1.8
16.0 16.0
I.3
Alkalinity
24.9
24.2
43.1 19.6
• Equivalent concentration in total atmospheric deposition were obtained by multiplying concentration in wet depo ition by the given coefficient.
Table 21.2. Parameters used in the ca1ibration procedure for TM9 (Montseny) and Avic (Prades)
catchments
Variable
TM9
Avic
Catchment area (ha)
5.9
51.6
Catchment slope (0)
36
26
Precipitation (mm year-I )
884
548
Runoff (mm year-I)
305
45
Air temperature (OC)
9
10
Stream CO2 partial pressure (atm)
0.0003
0.0035
Soils
Layer 1
Layer 2
Depth (m)
0.4
1.0
0.76
Porosity (frac)
0.55
0.2
0.47
Bulk density (kg m - 3 )
1200
1460
1400
Cation exchange capacity (meq kg- I)
100
I
Base saturation (%)
56
50
82
Exchangeable Ca (%)
45
30
59
Exchangeable Mg (%)
5
10
5
Exchangeable Na (%)
3
5
8
Exchangeable K (%)
3
5
10
SO. ads. max. capacity (meq kg-I)
7
2
5
SO. ads. half saturation (meq m- 3 )
800
2
800
Weathering rates (meq m- 2 year-I)
Ca
71
45
121
Mg
30
32
20
Na
13
71
6
K
11
1.5
2.8
Net uptake (meq m- 2 year-I)
Ca
0
80
46.5
Mg
0
10
5.3
K
0
8
17.9