UDK: 630*52/*56:528.8(234.422 Igman) Information about quantitative and qualitative forest attributes are the base for successful forest planning and management. Forest inventories collect number of data used for different estimations from large (management unit level) to small (forest stand) scales. Then, control sampling has to be done in order to confirm regularity of terrestrial work. Such sample becomes data source too.  Recent approach for forest characterization includes all available information as sources for additional non-standard insight. Here were used available data about wood volume and increment from control sample for high forest on mountain Igman. Also, recent Landsat TM image from vegetation period was available and used in this research. Here is applied k nearest neighbor’s estimation method. Five nearest neighbors and Euclidian distance is chosen for estimation and mapping. Biases for all forest attributes were non-significant. Obtain results show non significant differences between means and observed and estimated distributions of wood volume and increment. It is estimated higher mean wood volume and increment of broadleaves while means for conifers and totals are lower. That higher wood volume and increment is estimated in all diameter classes for broadleaves while lower quantities are estimated for conifers. Spatial mapping presents distribution of wood volume and increment respecting variability of vegetation in high forest on Igman.

1 izv. prof. dr. sc. Tarik Treštić, e-mail: t.trestic@sfsa.unsa.ba, doc. dr. sc. Osman Mujezinović, izv. prof. dr. sc. Azra Čabaravdić. Šumarski fakultet Univerziteta u Sarajevu, Zagrebačka 20, 71000 Sarajevo, Bosna i Hercegovina 2 mag. šumarstva Ismir Muratagić. ŠPD Unsko-sanske šume d.o.o. Bosanska Krupa, Radnička bb., 77240 Bosanska Krupa, Bosna i Hercegovina. UTJECAJ ČIMBENIKA MIKROLOKALITETA NA INTENZITET ZARAZE STABALA OBIČNE JELE BIJELOM IMELOM

UDK: 582.475:582.728.4(497.6)            630*44:582.475(497.6) In terms of the health status, in Bosnia and Herzegovina, European silver fir (Abies alba) is currently most threatened by the white mistletoe (Viscum album ssp. abietis). Along with drought and pollution, white mistletoe infestation plays an important role in silver fir decline. The aim of this research was to determine the intensity of infestation of European silver fir trees by the white mistletoe. In order to realize the defined aim, two compartments were chosen in the area of Forest Management Association of Zenica-Doboj Canton and Forestry Office “Olovo” where the analysis of the presence of mistletoe was conducted. In total, 451 fir trees were examined and an assessment of the intensity of infested trees was carried out by implementation of Hawksworth Index of Infestation. According to the results conducted by the research, it was determined that the intensity of infestation of European fir stands differed according to the thirds of crown of the tree. Significant differences were also found in the severity of mistletoe intensity on trees of host trees within the diameter classes. A large number of mistletoe shrubs further deplete the host tree, making it more susceptible to secondary attacks by harmful insects and pathogens.

UDK 582.728.4:630*27(497.6 Sarajevo) This paper has identified the presence of mistletoe (Viscum album ssp. album) on the trees in the urban part of Sarajevo. The mistletoe is a semi-parasitic flowering plant, which grows on a large number of hosts. In general, mistletoes are specialized species, which parasite only on particular trees and shrub species. They cause the dying of different forest species and the decorative trees. As for the forests in Bosnia and Herzegovina, the most important is mistletoe on fir (V. album ssp. abietis), while in terms of fruit trees and trees in urban areas, the mistletoe particularly grow on deciduous species (V. album ssp. album). Researches for the purpose of this paper were effectuated in 2008 in the area of municipality Novo Sarajevo. Mistletoe (V. album ssp. album) has been identified on 37 infected trees, or on 12 species belonging to 5 families and 7 genera. The analysis of number of shrubs in the crowns of infected trees identified the intensity of the infection by this semi-parasitic species. The mistletoe is a primary harmful agent on urban trees and shrubs. Larger number of mistletoe shrubs exhausts the infected host, and it makes the host suitable for the attack by other secondary harmful insects and pathogens. Thus, it is recommended to remove the mistletoe shrubs, even in early stage of development of disease, while the trees are still infected (1-2 shrubs) to a lesser degree.

The wild cherry (Prunus avium) has great and multiple importance. The fruits it produces are used for several purposes (as food for people, birds and other animals, as well as in phytotherapy). As many birds and mammals feed on the fruit of the wild cherry, it has the ability of dispersion over large areas in a very short time. It occurs from river deposits up to 1900 m/alt, while it is quite rare in the Submediterranean. Wild cherry grows as a solitary tree or in small groups, usually at the edge of the forest or within the forest in areas with more sunlight. The significance of the wild cherry is reflected in the high economic value of its wood, which makes it much demanded and popular, and thus endangered. The plant material was collected from 22 natural populations in Bosnia and Herzegovina. The fruit and leaves were collected from marginal or solitary trees, usually from the south-facing, outer sun-exposed parts of the tree crown. We measured the following fruit characteristics: fruit length (FL), fruit width (FW), fruit thickness (FT), seed length (SL), seed width (SW), seed thickness (ST), length of the stalk (LOS) and width of the stalk (WOS), and leaf characteristics: length of the petiole (LP), length of the leaf blade (LB), distance from the blade's base to the blade's widest part (BBW), width of the leaf blade (WB), insertion angle of the leaf venation (AV), number of leaf teeth on a 2-cm length (NT), blade width at 1 cm from the blade apex (WBA) and blade width at 1 cm from the blade's base (WBB). All statistical analysis of the data were made using the SPSS 15.0 package for Windows. The results obtained show the presence of a high level of intrapopulation, as well as interpopulation, morphological variability in the natural populations of the wild cherry which have been investigated. Analyses of population differentiation have not confirmed our expectations. Our results only indicate differentiation in the fruit size characteristics, but the indicators are very weak. The resulting high values of the regression coefficient in this research can serve to estimate the values of some features and characteristics without their measurement. The analyses of 16 morphological characteristics in 22 natural populations of the wild cherry in Bosnia and Herzegovina showed statistically significant differences between investigated populations. Differentiation in natural populations of the wild cherry was very low and identified only in fruit dimension characteristics.

UDK 630*92:519.237.8(497.6) According to FAO, the total forest area in Bosnia-Herzegovina amounts 2.709.769 ha or 53,4% of overall state territory. While the total area of private forests is 523.437 ha, private forest ownership is characterized by huge number of small-scale and fragmented individual estates. The aim of this research is to examine how the groups of private forest owners can be created with different clustering methods, regarding different criteria. The data presented in this paper are obtained from PRIFORT project (Research into the Organizations of Private Forest Owners Associations in the Western Balkan Region). Results show that private forest owners in Bosnia- Herzegovina can be grouped in three clusters by using different clustering methods, based on criteria defined in advance. Significant differences in willingness of private forest owners (PFO) to join to their interest associations are noticed for identified clusters. From forest policy aspect, the clusters gathering homogenous groups of private forest owners should be treated by different policy instruments (regulatory, economical or informational) in order to ensure better contribution of private forests to overall economical, ecological and social outcomes expected from forests as the most important natural resources in Bosnia-Herzegovina.

UDK 630*52:311.2(497.6)          630*52:007.5(497.6) Last decades permanent researches clarify possibilities for forest resource estimation based on terrestrial measurement and remote sensing. The most often the non- parametrical k-NN method is used integrating local estimates from terrestrial measurement and spectral Landsat data. In this paper the weighting functions of the k- NN related to value differences and distances were examined in a case of high forest in site Konjuh in Bosnia. It is found that weighting Euclidean distance has not resulted with efficiency increase. Procentual RMSE's of growing stock showed higher values for weighted estimates on the pixel level. Classified volume estimates on aggregated level compared with volumes from intensive regular forest inventory achieved moderate level of agreement. The agreements between volume estimates are almost perfect regardless on weighting functions. Obtained results point out unweighted estimates as reported in several cases.

UDK 630*4:712(497.6 Sarajevo) This paper analyzes the health status of trees in the avenues of the city of Sarajevo. Special attention is paid to abiotic harmful influences, snow precipitation and mechanical damage of trees, as the initial factors of destabilization of their health status. Sarajevo area is characterized by a moderate continental climate occurring as a result of the influence of central European climate from the north and the Mediterranean climate from the south and of the variety of the terrain. This type of climate is characterized by hot summers and relatively cold winters. Because of severe thermal influence of the Adriatic Sea autumn is warmer than spring. Distribution of precipitation in Sarajevo is characterized by summer (primary) and autumn (secondary) peaks. Specific weather conditions in this area, in some years, result in early or late snowfall the consequences of which are damages of vegetation cover. The results of this research confirmed significant damages of the trees resulted from the adverse effects of snow in October 2009 (branches fractures, split of the stem and fracture of tree crowns). The resulting injuries are suitable openings for the penetration of rot causing microorganisms (fungi and bacteria) and colonization of insects which is why we can expect further deterioration in the health status of trees in the future. The paper suggests activities the implementation of which can reduce these harmful effects of biotic factors.