DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 3-4/1999 str. 28 <-- 28 --> PDF |
M. Kovačević: PRIRODNA OBNOVA ŠUME I MAKIJE NA POŽARIŠTIMA U ARBORETUMU TRSTENO Šumarski list br. 3-4, CXX1I1 (1999), 109-11 8 Hećimović,M. 1982: Vegetacija razreda Quercetea Kovačević , M. 1995: Petstota obljetnica Gučetićeva ilicis na otoku Šipanu, Acta bot. Croat. 41. perivoja u Trstenom, Zbornik dubrovačkog pri Horvatić , S. 1963: Biljnogeografski položaj i raš- morja i otoka, 5: 403-408. članjenje našeg primorja u svjetlu suvremenih fi- Prpić , B. 1998: Šumski požari - tema ljeta, Šumarski tocenoloških istraživanja, Acta bot. Croat. 22: list 7-8. 27-80. Starčević,T . 1998: Protiv požara strukom i progra Kovačević,M. 1992: ArboretumTrsteno,ratnastra- mom, Šumarski list7-8: 364-365. danja prirodne i kulturne baštine, Priroda Trina j stić , I. 1993: Problem sukcesije vegetacije na 7-8:27-29. požarištima alepskog bora (Pinus halepensis Ko vačević , M. 1993: Arboretum Trsteno, ratna stra- Mili.) u Hrvatskom primorju, Šumarski list 3-5: danja kulturne i prirodne baštine, Zbornik dubro- 131-137. vačkogprimorja i otoka4: 145-156. Tri naj stić, I. 1996: Sukcesija vegetacije na požariKovačević , M. 1994: Arboretum Trsteno i Gučeti- štima šuma crnike i crnog jasena as. Orno-Querćev perivoj, Ekološki glasnik 5-6: 5-13. cetum ilicis u Hrvatskoj, Šumarski list 1-2: 3-7. 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. |