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Vegetation map of Nature Park "Žumberak – Samoborsko gorje" with minimum mapping unit of 2.25 ha (22500 m2) was created during year 2003. Combination of Landsat ETM+ satellite image (acquired in year 2000) and field sampling were used as a mapping method. Given the constraints of minimum mapping unit chosen, 17 classes were identified in the field and designated to corresponding polygons created by classification of satellite image. Thirteen classes were plant communities or their combinations, while remaining four denoted various types of land cover (coniferous plantations, mixed rural landscapes, settlements and quarries). In overall area of the Nature Park (344 km2), most frequent was Lamio orvalae – Fagetum forest (38.4 % of total area), while most frequent non-forest community was Bromo – Plantaginetum mediae (7.9%). According to this research, as much as 77.3 % of Park area is covered with forests, that is significant increase comparing to old data of 61 % of forests. Analyses of mapped polygons showed that almost quarter of all polygons has its area equal to, or just little bigger than the minimum mapping unit, while more than three quarters of all polygons have their area smaller or equal to 9 ha (corresponds to 300 x 300 meters square). Such extreme mosaic landscape structure with constant depopulation of Park area causes further natural forestation of park and hence decreases in biodiversity. Overall accuracy of map was 65%, with forest vegetation being mapped with higher accuracy (70%) then the non-forest vegetation (61%). |
