Aboveground Biomass of Silver Fir, European Larch and Black Pine

U radu je prikazano istraživanje biomase nadzemnoga dijela stabla obične jele, europskoga ariša i crnoga bora. Rezultati su iskazani masom apsolutno suhe tvari drva debla, kore debla i grana. Istraživanje je provedeno na 15 stabala obične jele na području UŠP Delnice, 28 stabala europskoga ariša na području UŠP Koprivnica i 40 stabala crnoga bora na području UŠP Split. Obujam drva debla i kore debla utvrđen je metodom sekcioniranja. Određena je masa grana i prosječni udio vlage grana. Izjednačene vrijednosti obujma drva debla i kore debla pretvorene su u masu suhe tvari pomoću prosječnih obujamnih težina apsolutno suhoga drva, odnosno apsolutno suhe kore. Izjednačene vrijednosti mase grana umanjene za prosječni udio vode rezultiraju masom suhe tvari grana. Konstruirani su grafički prikazi s pripadajućim formulama izjednačenja ovisnosti mase suhe tvari drva debla, kore debla i grana o prsnom promjeru stabala istraživane vrste drveća.This paper presents the research of abovegroud biomass of silver fir, European larch and black pine trees. The results are presented as oven-dry mass of stem wood, stem bark and branches. The research was conducted at three sites in Craotia (Fig. 2). The sample consisted of 15 silver fir trees, 28 European larch trees and 40 black pine trees (Fig. 1). Stem wood and bark volume were measured by section method and regression equations were constructed (Table 2). Branch mass and their average moisture content was determined (51.84% for silver fir branches, 49.03% for European larch branches, and 49.24% for black pine branches). Dependence of branch mass on DBH was established (Fig. 7). Using the regression equations, wood volume, bark volume and branch mass were calculated for each DBH in the range of DBH of sample trees. The results were transformed to oven-dry mass by average oven-dry volume weight of wood and bark of researched species (Table 2) and by applying determined average moisture content of branches. Graphs were constructed showing the dependence of mass of dry matter on DBH, with the related regression equations (Fig. 8, Fig. 9 and Fig. 10). Total dry matter mass of silver fir trees ranges from 18.29 kg (DBH=10 cm) to 3759.93 kg (DBH=80 cm). European larch trees have a dry matter mass from 118.52 kg (DBH=25 cm) to 543.53 kg (DBH=33 cm), and black pine trees dry matter mass ranges from 58.23 kg (DBH=13 cm) to 334.75 kg (DBH=28 cm)