Environmental Engineering Reference
In-Depth Information
Figure 11.4
Seedling height and
diameter (mean and standard error)
of holm oak (
Quercus ilex
) seedlings
nine years after planting. CS: control
seedling, S + TS: seedling with tree
shelter, S + HG: seedling with
hydrogel. The plantation was
conducted in burned degraded
forests in the Region of Valencia
(Spain). Different letter means
signifi cant differences among
treatments at the
P
< 0.05 level.
Notice the low stem growth rate of
holm oak in these degraded lands, on
equator-facing slopes and under dry
climate (average annual precipitation
for the monitoring period: 360 mm).
(Modifi ed from Chirino
et al
. 2009 .)
Figure 11.5
Percentage of plants
surviving in relation to the length of
the dry period during the fi rst
post-plantation year, for several
native species planted in eastern
Spain. The fi rst set of plots (1992-
1994) includes plantations using
conventional techniques at those
times. The second set (2003-2009)
includes plantations using recent
technical innovations. Regression
lines for each plantation period are
signifi cantly different (ANCOVA
signifi cant interaction between
plantation year and dry period,
P
< 0.0001). ' Dry period ' refers to
the maximum number of
consecutive days with precipitation
less than 5 mm. See the text for more
details. (Elaborated from the
CEAM - University of Alicante
database. J.A. Alloza unpublished
data.)
