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A. Čami, J. Franjić & Ž. Skvorc: VEGETACIJA GRMAST1H ŠUMSKIH RUBOVA U SLAVONIJI ... Šumarski list br. 9-10, CXXVI (2002), 3-6
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SUMMARY: Forest edges present a special form of vegetation growing
between forest areas and non-forest, anthropogenetically influenced areas
(cultural landscape). The phytosociological analysis of forest edges started relatively
late, and, therefore, the first works dealing with this subject-matter
began to appear in the middle of the 20th century (cf Tuxen 1952; Miiller
1962). The interest for this type of research developed parallelly with the
awareness of biodiversity, i.e. of the wide variety and biological particularity of
boundary forest areas where the associations very rich in species can be found.


Although the forest edges are a relatively narrow zone between forest and
non-forest areas, the environmental factors for the forest edge are stable and
present a permanent stage. In most cases such transitions on the forest edges
can be understood as a continuity and discontinuity stage (cf. Dierschke
1974).


In the research of forest edge associations very often a methodological
problem is encountered. One of the main principles of the Central European
method are homogeneous areas and specific combination repeatability. The
forest edge areas are often very narrow and markedly long. In such a long and
narrow area very often several different combinations of species occur giving
such area a mosaic-like appearance. In making vegetational relives of forest
edges special attention has to be paid to the boundaries between associations
because it might happen that by negligence some species from the other associations
appear in a releve, that would cause an analysis and interpretation
problem.


Each forest edge builds a special phenomenon in the environment presenting
a very important element in it. Forest and non-forest areas do not differ
physiognomically only, they are ecologically different systems, too. In a narrow
forest edge zone dividing two such areas ecological conditions change
rapidly and species growing there must be very adaptable because they are a
barrier between two different microclimatic areas.


Usually, the forest is protected against the influences from the non-forest
areas by a zone of densely branched shrubs of various dimensions. This protective
zone is built by heliophilous forest species which have their ecological