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ŠUMARSKI LIST 3-4/2004 str. 20     <-- 20 -->        PDF

B. Belčić: STRUKTURNE OSOBINE 1 PRIRODNA SUKCESIJA RITSKIH ŠUMA NA UŠĆU MURE U DRAVU Šumarski list br. 3-4, CXXVIII (2004). 103-118
cultural treatments of tending and cleaning are conducted. The wood material
from tending and cleaning the young growth of riparian forests should
remain on the ground so that, due to the biomass fallen on the soil during
floods, sand and mud could be deposited. The ground is thus "raised " and the
conditions created for the occurrence of the white willow, which is in fact the
most valuable economic species in these forests. Almond willow, together
with white willow, forms normal riparian stands to which all silvicultural
treatments should be applied taking account of biological specificities of each
species. In the optimal stage with a regular water regime, white willow produces
a considerable growing stock (up to 368.11 m3/ha), and may consequently
be considered a valuable economic species of riparian forests. In
terms of structure, middle-aged stands of riparian forests in Podravina display
similarities with those in Podunavlje since willow is accompanied by
black poplar. Riparian forests of a virgin structure are not rich in woody
species as are other forests. In terms of structure, riparian forests may be
developed as pure stands featuring only one species (for example, almond
willow), or the principal species may be sporadically accompanied by another
species (for example, white willow with black poplar or white willow with
grey alder). In sites where water dynamics is not stable, natural riparian
forests may exhibit the structure of mixed stands in which it is sometimes difficult
to identify the dominant tree in the stand (usually two species), while the
understorey may be formed by four to six species. The shrub layer is not significantly
developed in the studied stands.


Key words: riparian forests, young willow growth, stand structure,
almond willow ^Salix triandra), white willow fSalix alba), black poplar
fPopulus nigra), white poplar (Populus alba), alder (Alnus glutinosa), grey
alder (Alnus incana), shrub layer