622 KB0 KB193820262021Klopčič, Matijaštevilka:1letnik:79str. 3-20ISSN:0017-2723COBISSID_HOST:54039299URN:URN:NBN:SI:doc-4AJQOJIUenslZveza gozdarskih društev SlovenijeGozdarski vestnikEuropean beechforest development modelforest development simulationsforest inventoryforest standgozdna inventuragozdni sestojmean quadratic diametermodel razvoja gozdovNorway sprucenumber of treessestojna temeljnicasimulacije razvoja gozdovsrednje temeljnični premerstand basal areaštevilo drevesPreverjanje uporabnosti modela SiWaWa za simuliranje razvoja čistih bukovih in smrekovih enomernih sestojev v Sloveniji| The applicability of the SiWaWa stand model for simulating stand development of pure beech and spruce even-aged forest stands in Slovenia|Forest development models predict development of trees and forest stands according to tree, stand, site, and forest management factors. Due to complex nature of forest ecosystems and long production cycles, forest development modelling is an important feature of forest management. Stand models have been identified as suitable for decision support in forest management, an example of such a model is the Swiss model SiWaWa, which was tested in Slovenian forests in the present study. Forest development simulations for 10-y periods were performed on four samples of 50 permanent sample plots in unmanaged and managed pure beech and pure spruce stands. Afterwards, we compared the actual and modelled values of stand basal area G, number of trees N, and mean squared diameter Dg. Predicting the development of pure beech forests was fairly accurate, the root mean square error RMSE for G was 2,35 m2 /ha for unmanaged, and 3,42 m2 /ha and 4,35 m2 /ha for managed stands considering only harvesting or entire mortality, respectively. We cannot claim the same for the development of pure spruce stands. Measures of accuracy were significantly worse, the RMSE was 8,94 m2 /ha for unmanaged stands, and 6,13 m2 /ha and 6,11 m2 /ha for managed stands considering only harvesting or entire mortality, respectively. The SiWaWa model, parameterized for Swiss forests, seems to be applicable for simulating the development of pure beech forests without or with simulated fellings, but the model does not yet provide reliable simulations for pure spruce standsModeli razvoja gozdov napovedujejo razvoj dreves in gozdnih sestojev glede na drevesne, sestojne, rastiščne in gozdnogospodarske dejavnike. Zaradi kompleksne narave gozdnih ekosistemov in dolgih proizvodnih ciklov je modeliranje razvoja gozdov pomemben sestavni del upravljanja gozdov. Sestojni modeli so bili prepoznani kot primerni za podporo odločanju pri upravljanju z gozdovi. Primer takega modela je švicarski model SiWaWa, ki smo ga preizkusili v pričujoči raziskavi. Na štirih vzorcih po 50 stalnih vzorčnih ploskev v negospodarjenih in gospodarjenih čistih bukovih in čistih smrekovih enomernih sestojih smo izvedli simulacije razvoja gozdov za obdobje 10 let, nato pa smo primerjali dejanske vrednosti in modelske napovedi za sestojno temeljnico G, število dreves N in srednje temeljnični premer Dg. Napovedovanje razvoja čistih bukovih gozdov je bilo zadovoljivo točno; v negospodarjenih sestojih je celotna napaka RMSE za sestojno temeljnico znašala 2,35 m2 /ha, v gospodarjenih sestojih pa 3,42 m2/ha ob upoštevanju le posekanih dreves in 4,35 m2/ha ob upoštevanju celotne mortalitete. Enako ne moremo trditi za napovedovanje razvoja čistih smrekovih sestojev. Pri slednjih so bile mere točnosti znatno slabše, saj so RMSE za napovedano sestojno temeljnico znašali 8,94 m2/ha za negospodarjene in 6,13 m2/ha ter 6,11 m2/ha za gospodarjene sestoje ob upoštevanju poseka oziroma celotne mortalitete. Model SiWaWa, ki je parametriziran za švicarske gozdove, se zdi uporaben za simuliranje razvoja čistih bukovih gozdov brez simuliranega ukrepanja (poseka) ali z njim. Zanesljive simulacije razvoja čistih smrekovih sestojev pa model zaenkrat še ne omogočaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaZveza gozdarskih društev Slovenije