Woody plants within the environment of the Sibensko-kninska County schools.
This paper presents a list of woody plant taxa and their dendrological and horticultural qualities. Taxonomical, ecological and phytogeographical analysis covers 85 taxa. The results are given in Tables 1-6 and Figures 1-4. There are 40 families and 85 taxa in total (Table 1 and 2), 8 of them belonging to gymnosperms and 77 to angiosperms. The angiosperms are largely dominated by the dicotyledones (70 taxa, 82.35%). The largest number of species belong to the Rosaceae (9 taxa, 10.59%), Fabaceae (7 taxa, 8.24%) and Oleaceae (6 taxa, 7.06%) families. Species from the above mentioned 3 families make 25.89% of the total woody plants. The composition of woody plants within the environment of the Sibensko-kninska County schools is heterogeneous which is obvious from the large number of families (40) and species (85). There are 2.125 species per family. The school in Tisno has the largest number of woody species (43 species), the second place belongs to Brodarica (32), followed by Murterski skoji (28), Jezera (26), Pirovac (25), Petar Kresimir (17) Juraj Sizgoric is the last with 16 species (Table 3). Analysis of dendroflora due to habitat type (acc. Erhardt et al, 2002) indicates the dominance of shrubby forms (52 taxa; 61.18%), followed by the trees (25; 29.41%), while the group of woody climbing plants is the least represented (8; 9.41%), (Table 4). The total of 85 taxa of woody plants within the environment of the Sibensko-kninska County schools include 48 (56.47%) evergreen and 36 (42.35%) deciduous species. The only deciduous-evergreen plant is the beautiful bougainvillea (Bougainvillea spectabilis Willd.). Within the dendroflora of the Sibensko-kninska County school, there are 25 (29.41%) autochthonous and 60 (70.59%) allochthonous species. The allochthonous ones are dominated by species in culture (41 species, 48.24%), casual (14; 16.47%) and five naturalised. These results are consistent with those relating to other parts of Croatia. Woody plants in the Sibensko-kninska County schools, naturalised species are represented by two species (Agava americana L. and Rhus typhina L.) and the invasive ones by three species (Ailanthus altissima (Mill.) Swingle, Robinia pseudoacacia L. and Broussonetia papyrifera (L.) Vent.). Regarding geographical origins (Table 5), the allochthonous dendroflora around the Sibensko-kninska County schools is dominated by species from Asia (21 taxa, 35%), North America (12 taxa; 20.00%) and the Mediterranean (11.67%). The most frequent Asian species are those coming from China (Broussonetia papyrifera, Kerria japonica, Jasminum nudiflorum etc). Among the decorative species around schools there are also 24 species whose parts (leaves, bark, fruit or the whole plant) contain toxic substances. Those with toxic fruit are particularly dangerous. The results of the analysis show an unexcusable negligence of the autochthonous species, quite as decorative as the foreign ones. Domestic species are better adjusted to environmental conditions which makes taking care of them much easier.