Element Budgets in Catchments
289
Therefore, net exports, computed from two fluxes (inputs and gross outputs)
which are strongly related to water fluxes, presented also a strong relationship with runoff (Figs. 20.1 and 20.2). For Montseny, only TM9 is shown as
TMO behaved similarly for the 4 years of simultaneous record.
The relationship between annual net outputs and annual runoff was significant for all elements (P < 0.001 for Montseny, P< om for Prades) except for
the more biologically controlled elements, Nand K. Plots for Na+, Ca2+, CI-, S
a)
b}
Net export L'Avic 1982-94
Net export L'Avic , 982-94
8
•
4
•
6
• •
z
!>.
4
-' ~
~
..... ... Z
... 0
s;
s;
•
.....
•
......
•
-' .
C>
~
.><
0
. -'
. . '
-Z
•
•
...
-' ..
u
-'
z
-Z
~ '
-4
, ..
-4
r-o.70
•
'I - -Z.4+0.09r. r-o.84
• •
'1- -4.8+ O.o6x;
0
20
40
60
80
100
0
ZO
40
60
80
100
so
4
•
•
40
• "
• ."
; '
,, (
•
2
,
...
...
•
- - '
>- 30
•
>.....
"
....
...
" •
s;
s;
.
..... Zo
.....
0
C>
~
...
'"
10
...
rJ)
~ /
U
-
-2
. .
0
"
•
'1- -1 .
9+ 0.49x; r-o.94
#
y- -2.S. 0.06x; r-o.79
- 10
0
20
40
60
80
100
0
ZO
40
60
80
100
Annual runoff (mmlyr)
Annual runoff (rrmlyr)
c) 0
-I
... >.... -2
s;
.....
C>
-3
...
z
• •
- e· _____ _
- - - - e-. __
•
•
-4
•
_ c
•
•
'1_ -2.9+ O.ooox; r-o.35 (n.s.)
0
ZO
40
60
80
100
Annual runoff (mm/yr)
Fig. 20.2. Net exports at Prades for a litophilic ions, b atmophilic ions, and c biophilic ions. For
Na+ and ct, the estimated dry deposition contribution to net throughfall (0.7 and 1.2 kg ha- 1
year-I, respectively) has been added to their inputs in bulk deposition. Sulphur has not been
corrected for dry deposition