zdravstveno stanje gozdov v sloveniji v letu 2ooo - Gozdarski inÅ¡titut ...

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154 Zbornik gozdarsMa in lesarstva, 67 6 SUMMARY The beginning of the systematic monitoring of forest health in Slovenia dates back to 1985. The main features are annual inventorying of plots on a l6xl6 km grid and occasional inventorying of plots on a grid af 4x4 km. The denser grid and more intensive inventorying have been shown to be useful since the country needs credible data in order to be able to monitor the process within the national boundaries and to provide necessary action. Since its early implementation, the inventory methad has been continuously improved from the methodological and from the inventory content point of view. The latest inventorying on the 4x4 km grid was performed in the year 2000. Unlike the previous inventory system (based on the European proposal - four 6lree plots), the new concept required monitoring forest conditions on the newly established permanent sample plot and on two (of four) already existent 6-tree sample plots. The aim of the changed monitoring design was to assure representative data concerning the entire forest population, to monitor single trees and to provide links to the results obtained in the past. The sumey was composed of 18.808 trees on 713 plots. The average defoliation of all trees was 20.5%, while the portion of damaged trees (defoliated more than 25%o) was 22.2%. Compared to the 1995 survey, both parameters have slightly decreased. In addition, for the main tree species the average defoliation and the portion of damaged trees have decreased, although in all cases the dffirences could not be proved statistically s ignificant. The analysis of the latest results, along with the change analysis, reveals that the conditions ofslovenia's forest are considerably stable and that the process of decline has not progressed with the intensity that had been predicted in the early eighties. However, analysis of just the trees included in the sample from the beginning of inventorying indicates that the health of these trees is worsening (the dffirences between the results obtained on the 6-tree and the permanent sample plots are significant). Such a result leads to a conclusion that forest conditions are in fact influenced by two kind of impacts: by those resultingfrom the external environment and byforestry actions.
7 VIRI REFERENCES 15s Hoievar, M., Mqvsar, R., Kovai, M.: Zdravstveno stanje gozdov... 1987/1696/EEC, 1987. Commission Regulation (EEC) No. 1696 187 of l0 June 1987 laying down certain detailed rules for the implementation of Council Regulation (EEC) No. 3528 / 86 on the protection of the Community's forests against atmospheric pollution (inventories, network, reports).- 1987, Official Journal of the European Communities No. L l6l, s. | -22. BATId, F., 1991 . Propadanje gozdov v Sloveniji, pogled na proces in stanje po desetih letih aktivnosti na tem podrodju.- ZbGL,52.5-22. BOGATAJ, N., 1997. Propadanje gozdov v Sloveniji - stanje v letu 1995 in spremembe v obdobju 1985 - 1995.- ZbGL,52 53-92. DE VRISE, W. / KLAP, I. M. I EzuSMAN, J. W., 2000. Effects of Environmental Sfress on Forest Crown Condition in Europe. Part I: Hypotheses and Approach to the Study.- Water, Air and Soil Pollution 119: 317-333. HMZ, 2000. Agromet Mesedni agrometeorolo5ki bilten 44.- Ljubljana, Hidrometeorolo5ki zavod RS. HOdEVAR, M., 1990. PoSkodovanost in rast smrekovega gorskega gozda na pokljulkojelovi5ki planoti.- ZbGL, 36:27 -68. HOCEVAR, M., 1993. Dendromeffija - gozdna inventura.- Ljubljana, Univerza v Ljubljani, BF, Oddelek zagozdarstvo,2T4 s. INNES, J. L., 1993. Forest Health - its Assessment and Status.- Cambridge, CAB International,5l4 s. JURC, D. / BOGATAJ, N., 1994. Preudevanje propadanja gozdov v Sloveniji.- V: Varstvo zraka - stanje in ukrepi za izbolj5anje stanja v Sloveniji. Bled, Zavod za tehnidno izobralev anje, s. I 0/ I - I 0/8. KLAP, J. M. / VOSHAAR J. H. O. / DE VRIES, W, / ERISMAN, J, W., 2OOO, EffCCtS Of Environmental Stress on Forest Crown Condition in Europe - Part IV: Statistical Analysis of Relationships.- Water, Air and Soil Pollution l19:387-420. KOVAe, M., 1991. Zasnova prostorskega informacijskega sistema za spremljanje stanja in gospodarjeja z gozdnato krajino - primer na velikoprostorski ravni.- Ljubljana, Univerza v Ljubljani, VDO BF, VTOZD zagozdarstvo, 152 s.
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Page 7 and 8: 2.3 TERENSKO SNEMANJE FIELDWORK Hoi
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Page 13 and 14: z analizo traktnega indeksa osutost
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