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SUMMARY: The paper presents natural spreading and forming pioneer
stands and numerousness of natural new growth in whitebark pine forests.
The research is carried out in westernmost part of natural area of the white-
bark pine in Hercegovina on the mountain of Čvrsnica, nearby natural
unmanagement stands. Natural spreading of the whitebark pine was
researched through forming pioneer stands on nerby unforested area in
development stage of the seedling plant, new growth, young corp and young
stand. Process of natural spreading advance by progressive sucession in the
colonisation rate zone and in all development phase. Researching of nuerousnes
and structure of young generation, was defined with registration and
distribution by height classes for finding possibility of natural regeneration of
whitebark pine stands at the age and development stage of middleaged,
mature and oldgrowth stand. Numerousness of natural new growth increse
with the age of stand, so a total average numerousness for all stands is 5. 812
piece/ha, while a total average numerousness of natural seedling plants for
all stands is 757 piece/ha.


A total average numerousness of natural seedling plants and new growth
is 6. 569 piece/ha. Numerousness of natural new growth is important indicator
of possibility of natural regeneration whitebark pine stands that depend
on the site, the age and development stage and on a deegre of canopy cover,
also. Oldgrowth stands of whitebark pine and with average number of natural
new growth can have good natural regeneration. Results of this rerearch give
us better knowledge and understandings about regular and quality relationship
towards this tipes of the forest.


Key words: natural spreading, progressive sucession, forming pioneer
stands, numerousness natural new growth and stand age.