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SUMMARY: The aim of this research on the natural regeneration of vegetation on the
burned surfaces in Arboretum Trsteno of Croatian Academy of Science and Art was to recognise
the trand and stage ofsuccesion in the course of reforestation seven years after the fire.


In Arboretum macchia is present only as a fragment. The research carried out on the basis of
twoo vegetational records, included 42 species. A certain number of heliophil species which
have moved in from the rock grasslands are registrated in the records and are notable in the biological
spectrum. Next to predominant Phanerophytes (26,8%), the Therophytes (23,2%) and
Hemicryptophytes (13,7%) are significantly outstanding. It is noteworthy that Euphorbia dendroides,
due to the opening of the vegetational cover caused by fire, has moved in by seeds from
the near stand.


The wood of alleppo pine has been developed on the bases of macchia as fades of the subassociation
Orno-Quercetum ilicis myrtetosum. Terrains which are overgrown with woods today
were mainly cultivated and abandoned 80 years ago, though many remains of old trees ofOlea
and Ceratonia can be found still today. In 6 vegetational records 51 species are included with
predominance of Phanerophytes (60,8%) while Chamaephytes (17,75) and Hemicryptophytes
(13,7%>) take a bigger share in biological spectrum.


The vegetational cover of the burned surfaces which have been researched is regenerating
by sprouting from the underground organs of burned plants and by the seeds of plants from the
same and surrounding localities. The proportion of the number of species which regenerate by
sprouting and spreading by seeds is significant and amounts 1:2,5 for macchia and 1:1 for
wood formation. Due to rather fast regeneration by sprouting from the roots the bush layer soon
becomes dense and homogenuous and heliophil herbs decrease continually because of the increasing
shade. Pinus halepensis regenerates due to natural reproduction by seeds like spontaneous
species and on the burned surface its abundant offspring reaches the hight of about 2 m.


The comparison between average number of species per record for burned wood stand in
Arboretum (2 7,5 species) and for similar unburned stand on Sipan (25 species) shows unsignif
icant difference.


As the result of research final conclusion should be that fire hasn ´t caused the significant
change (neither qualitative nor quantitative) in essential floristic composition of researched
alleppo pine wood and macchia stands. The course of succession, seven years after the fire
tends to anew toward the same association as it was before the fire.


Such an early stage of alleppo pine wood is dense and absolutely impassable and therefore
highly endangered with fire, especially if burned and overthrown trees are not removed. Rotten
trunks are also favourable substrate for progressive development of secondary ksilophagus
parasite population which represent a threat of later damage on vegetation.


Renewal of vegetation in Arboretum which is in the course of its natural regeneration has to
be supported by clearing terrains of burned and rotten trees and by protection from graizing
and pasturing. Further maintenance of this part of Arboretum has to be carried out through
protection of natural surfaces on the bases of nature reserve, which absolutely corresponds to
strategy of managing with object protected by the Legislature on the Protection of Nature.