Magistro darbe tiriamas miško žėlimas neapaugusioje mišku žemėje, vertinami įvairūs veiksniai įtakojantys savaiminį miško formavimąsi. Darbo objektas: 8 želvietės neapaugusioje mišku nedirbamoje žemėje. Darbo tikslas: įvertinti miško žėlimą ir jį įtakojančius veiksnius buvusioje žemės ūkio paskirties neapaugusioje mišku žemėje. Tyrimo metodai: aštuoniose žėlimo plotuose buvo išskirtos laikinos stačiakampės apskaitos aikštelės 10 m2 (2 x 5 m). Jose buvo nustatoma savaiminukų rūšis, skaičius, amžius, aukštis bei pažeidimai. Gautų duomenų apdorojimui, t.y. grafiniam duomenų pavaizdavimui, buvo naudojama Microsoft Excel programa. Darbo rezultatai: apibendrinus gautus duomenis nustatyta, kad visose tirtose želvietėse, rastas savaiminukų kiekis pakankamas naujam miškui formuotis. Nustatyta, kad dviejuose sklypuose tikslinės rūšys neatitiko norminių dydžių. Geriausios sąlygos miškui atsikurti P vyraujančių vėjų kryptis bei iki 60 m atstumas nuo miško pakraščio. / This master work analyzing forestry natural regeneration in abandoned agricultural land, evaluation various subjects that influence to natural regeneration. Object of the work: 8 natural regeneration areas to abandoned agricultural land. Aim of the work: investigate natural forest regeneration process on abandoned agricultural land in district of Švenčionys. Methods: the research was accomplished in eight natural regeneration areas in forest stewardship of Švenčionėliai. There were chosen 63 research bars depending of forest area (every at 10 m2) at research time in this places. Results: the results of this investigation showed that birch and pine seeds are enough for itself forest sprouting in all research bars. The seeds were found from twenty to one hundred forty eight meters from the forest edge. The best conditions to forest`s sprouts grow is south directions and by 60 meters edge of a wood.

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This master thesis focuses on extensification of agricultural production and land use, and on driving forces and factors that influence this process. The research concentrates on land-use changes resulting from the extensification of agriculture (especially grassing-over and abandonment of agricultural land) in last twenty years. Emphasis is put on an analysis of driving forces of extensification processes that have an influence on land-use change. Factors with an impact on extensification are divided into natural and socio-economic ones. Natural factors are represented for example by air temperature, precipitation, altitude, slope, or soil productivity. As socio-economic ones we consider for instance the Common Agricultural Policy of the European Union, Gross Domestic Product, population density, spatial exposedness, or patterns of use and ownership of agricultural land. These factors are studied on European, Czech and local scales. Data for this research were collected from international and Czech databases; on the local level there was performed the author's own field research. Results of this thesis are obtained by quantitative research that demonstrate the main influence of natural driving forces on the process of extensification in Europe. Land-use changes related with extensification of agriculture...