le natural veg-
: t season),
if the differ-
the main crops
; u remen t s of
vegetation
wet sea son .
iurements of
; of its veg-
leve1opment,
I" of the USLE
al vegetation,
ages of 11 C"
en t coverage
if the area
ide on the
'en by techni-
i of the per-
; diverse cov-
t was made
.andsat pic-
the wet sea-
I controls.
:a 1 cui at ion of
: after the
lua 1 357 of
: or Agriculture,
i be seen that
:ween the soil
: cove rage va 1 -
íoun ta i nous
II woo d , po s -
:<0.1). To-
deciduous f o r -
i be con s i d -
precipitation
jht1y cove rage
central and
ihaco forest,
p roces ses,
(0. 16-0.20)
the main crops.
main crops
the region
ations in the
rage values
xploitation,
f the sorghum
Finally, in
- -
EROSION HAZARD
Location mao
rNo erosion
Soil loss
Tn / ha/y.
0 - 5
I •. • ] Very low
5-14
11 Zl Low
14 - 29
Moderate
29 - 47
mg Mod ® ,ely
47 - 63
High
63 - 60
Very high
> 80
'K'
600 0.6
500*0.5
400
300
200*0.2
100
0.1
mts.
2.5
2.000
1.50'
1.i
500
000 ^
EZ3 sfJity a iR) r0 ‘ E3 ^E3 siop^ (LSI E3 < CI B ha¿r 0 í
l / 'i
'—r
\
ell*"*?**-*?' -
<-* ✓
^ —M — K—K—X — » -* - *
-X
'■* w ■
007
•lS
10
100
4 00
200
[V/»l Granito
lZrrI-r| Loess
Sandstone
Sandstone and Rpgn a-Gravel b-Sand
silt tLaMlc-Silt d-Clay
abed
FIGURE 7 Schematic erosion hazard map of the study area with a profil (PP 1 ) showing the region
al distribution of erosion factors and soil loss
the alluvial plain, the sugar cane and cere
als cultures are the ones which show the low
est coverage values (0.26-0.35), thus reflec
ting the prolonged period of their vegetative
cycle during which they remain with little
cove rage.
THE EROSION HAZARD
The schematic map of FIGURE 7 shows the ero
sion hazard classes in the area expressed in
d i fferent. rates of potential soil, loss, as it
can be seen in the attached TABLE 1 and in the
profil also included in figure 7, the erosion
factors in the extended studied area show a
great variation which is reflected in the wide
range of values obtained for the potential
soil loss.
TABLE 1 Variation extremes of erosion factors
Erosion factors Values interval
Rainfall erosivity ( R)
Soil erodibility (K)
Slope ( LS)
Coverage (C)
Potential soil loss
110-600
0.30-0.65
0.15-16
0.005-0.34
1.7-90 tn/ha/y
673
