12 research outputs found
Application of Generalized Taper Model of Norway Spruce Tree in Forestry Practice
U radu je prikazan jedinstveni model oblika debla smreke, razvijen primjenom modificirane Brinkove funkcije, za podruÄje Bosne i zapadne Srbije. Cilj istraživanja je izvrÅ”iti prilagoÄavanje jedinstvenih modela (Model 1 i Model 2) oblika debla prikazanih u radu MatoviÄa, i dr.(2007) za jednostavnu praktiÄnu primjenu u Å”umarstvu. Jedinstveni model dobiven u ovome radu (Model 3) pokazuje neÅ”to manju preciznost procjene promjera duž debla i volumena stabla od jedinstvenih Modela 1 i 2, ali je joÅ” uvijek dovoljno precizan, pa se uspjeÅ”no može rabiti u Å”umarskoj praksi. U radu je izvrÅ”eno i usporeÄenje jedinstvenih modela oblika debla s klasiÄnim dvoulaznim volumnim tablicama. Model 3 ima znaÄajnu praktiÄnu primjenu i može se koristiti za procjenu volumena cijelog ili dijelova debla, promjera na bilo kojemu dijelu debla i neposredno visina stabla na kojima se nalaze karakteristiÄni (traženi) promjeri.By applying modified Brinkās function, this paper presents the unique generalized taper model of Norway spruce tree, developed for the area of Bosnia and west Serbia. The objective of this research is adapt generalized taper models (Models 1 and 2) for trees presented in the paper MatoviÄ, et al. (2007), for practical use in forestry.
The significant quality of the modified Brinkās function is the correlation of the characteristics of individual trees and stands and the function parameters, so in this way generalized taper models can be calculated for the use in a definite geographic region.
The study of Norway spruce taper is based on the data collected from 86 even-aged stands in the region of Bosnia and west Serbia, which is adjacent to Bosnia. The total number of model trees is 156, and the number of data pairs (diameter-height) is 2028.
The original parameters i, p and q of the modified Brinkās function were first calculated for all model trees by the optimisation method - equations (1). By applying the multiple regression method, a link has been established between original values of parameters i, p and q, and characteristics of individual trees (diameter at breast height and tree height), i.e. Model 3 has been obtained.
Model 3 is consisted of three functions used for determining the parameters of generalized taper model i, p and q. Unknown parameters of the three functions a1, a2, a3,...,.a15 are determined on the basis of available data, by applying multiple regression ā equations (2), (3) and (4).
In order to test the estimation of taper volume, on the material used for the development of generalized taper models of spruce trees by applying multiple regression, dual input volume tables were created. For that purpose NƤslund and Schumacher-Hall functions were used ā equations (6) and (7).
This research confirms that Model 3 shows less accuracy in estimating the diameter along the taper and volume than Models 1 and 2, which besides using the diameter at breast height and tree height, also require using the stand quadratic mean diameter. However, such difference, from the aspect of practical use, is not important, so Model 3 that applies only the diameter at breast height and tree height (in fact, reduced to the level of dual input volume tables) can be successfully used in forestry practice.
Obtained Model 3 is the superior substitute for conventional dual input volume tables, because besides the total volume it enables the volume estimation for particular parts of the standing tree, and also estimation of the diameter along the taper. Model 3 indirectly enables the calculation of tree heights with some diameters characteristic for forestry practice.
Model 3, with all above mentioned practical possibilities, can be very simply used by applying one EXCEL application. Because of the dimensions of trees used for Model 3 design, it can be reliably used in practice for Norway spruce trees with diameters at breast height of 10 to 60 cm and height of 6 to 37 m
Quality and Assortment Structure of Beech High Forests in Serbia
The paper presents research results on quality and assortment structure of uneven-agedbeech high forests in Central Serbia. Eleven representative stands of submontane beech forest(Fagenion moesiacae submontanum B. Jov. 1976 ) and montane beech forest (Fagenion moesiacaemontanum B. Jov. 1976) were selected. Their altitude ranges from 450 m to 1350 m. Site class rangesfrom I/II to III/IV, canopy closure from 0.7 to 0.9 and volume from 290 m3/ha to 522 m3/ha. Total areaof the stands is 241.9 ha. Sample plots of 500 m2 were established in a systematic grid of 100 x 100 m.From silvicultural aspect, 16% of the standing volume (384 m3/ha) is class one, 39% is class two and45% is class three. From the aspect of forest utilization 37% of the volume is class one, 34% is classtwo, 19% is class three, and 10% is class four. In the assortment structure of the average stand volume,industrial wood accounts for 42%, cordwood 48% and waste 10%. It has been concluded that beechhigh forests in Serbia have unfavourable quality and assortment structure. This situation should beimproved in future by taking adequate management measures
Usporedba strukture sastojina gospodarenih i praŔumskih bukovih Ŕuma Srbije
This study presents results of the comparison of structural and production characteristics of managed and virgin European beech forests in Serbia. Five managed and three virgin European beech stands were studied. The aim of this research was to determine the impact of the previous forest management on the structural diversity and production characteristics of managed European beech high forests in Serbia. The observed stands are located in the mountainous range of 400 to 1200 meters above sea level in the areas with the most productive beech forests in Serbia. Structural characteristics were compared using the following parameters: Height curves, Diameter distribution, Gini index, Coefficient of variation, Slenderness coefficient and maximum dimensions of standing living and dead trees. Stand density and productive characteristics were studied using the following forest estimation elements: number of trees, basal area, volume, biomass, carbon stock, stand quadratic mean diameter, Loreyās mean height and volume of dead wood. The greatest differences were found in the dimensions of the largest trees in managed and virgin beech forests (diameters at breast height and heights). Certain differences were found in the shape of Height curves and Diameter distribution and in the values of Slenderness coefficient. However, the Gini index and the Coefficient of variation show that these managed beech forests in Serbia substantially preserve the primeval structural diversity. The differences in the average value of most forest estimation elements of managed beech high forests in Serbia compared to virgin beech forests are statistically significant, which tells us that the previous management had a significant impact on the changes in the production characteristics of these forests in Serbia.U radu se prikazuju rezultati usporedbe strukturnih i proizvodnih karakteristika bukovih sastojina gospodarskog iĀ praÅ”umskog tipa u Srbiji. Istraživano je pet sastojina gospodarskogĀ i tri sastojine praÅ”umskog tipa. Cilj ovog istražiĀvaĀnja bio je utvrditi utjecaj prethodnog gospodarenja Å”umama na strukturnu raznolikost i proizvodne osobine visokih bukovih Å”uma u Srbiji. Istraživane sastojine nalaze se u planinskom rasponu od 400 do 1200 metara nadmorske visine u podruÄjima gdje se nalaze najproduktivnije bukove Å”ume u Srbiji (slika 1 i tablica 1). Strukturne karakteristike usporeĀÄeĀne su pomoÄu sljedeÄih parametara: visinske krivulje, debljinska struktura, Gini indeks, koeficijent varijacije, koeficijent vitkosti i maksimalne dimenzije dubeÄih živih i mrtvih stabla. Sastojinsku gustoÄu i produktivne osobineĀ prouÄavane su pomoÄu sljedeÄih procijenenih taksacijskih elemenata: broj stabala, temeljnica, volumen, biomasa, zaliha ugljika, srednji promjer po temeljnici, Lorajeva srednja visina i volumen mrtvog drveta. NajveÄe razlike pronaÄene su u dimenzijama najveÄih stabala u bukovim sasatojinama gospodarskog i praÅ”umskog tipa (tablica 4). OdreÄene razlike proĀnaĀÄene su u obliku visinskih krivulja i debljinskoj strukturi, i vrijednostima koeficijenta vitkosti (slike 2, 3, 4 i 5, i tablica 3).Ā MeÄutim, Ginijev indeks i koeficijent varijacije pokazuju da su bukove sastojine gospodarskog tipa u Srbiji u velikoj mjeri saÄuvale iskonsku strukturnu raznolikost (tablica 2 i slika 6). Razlike u prosjeÄnim vrijednostima taksacijskih elemenata sastojina gospodarskog tipa visokih bukovih Å”umama u Srbiji u odnosu na sastojine praÅ”umskog tipa su statistiÄki znaÄajne, Å”to nam govori da je prethodno gospodarenje imalo znaÄajan utjecaj na promjene u proizvodnim karakteristikama ovih Å”uma u Srbiji (tablica 5)
Jednofazna žetva semena žutog zvezdana univerzalnim žitnim kombajnom
The biggest problem in seed birdsfoot trefoil harvest is pod cracking before and during harvest. At full maturity, birdsfoot trefoil pods crack easily, resulting in seed spillage and hence seed losses. The cracking pod problem significantly limits the successful production of seeds. Exploitation indices, operational performance and reliability of a used general-purpose Claas Mercator 50 combine harvester in harvesting birdsfoot trefoil seed were studied. The testing was carried out in field conditions in Western Serbia area. The losses of grain over the cutter bar and over the threshing machine were found out.Total header and thresher losses ranged from 21.28% to 23.86% at an operating speed of 2.04 km/h and 2.63 km/h, respectively. This is an expected result for the crop under increased crop moisture conditions. There was loss of operating time i.e. congestion of unharvested grain due to increased operating rate, seed moisture and straw. Time consumption for elimination of harvesting delay at a rate of 2.63 km/h was higher than at a rate of 2.04 km/h and accounted for 13.48% of the total operating time. The research also involved monitoring of intensity pod cracking during the day depending on air temperature. Birdsfoot trefoil pod opening intensity increased of starts after 11 a.m. at air temperatures over 30 0 C when 80-90% of pods crack at 17- 20% moisture.U žetvi semena žutog zvezdana najveÄi problem predstavlja otvaranje mahuna pre i toku žetve. U punoj zrelosti mahune žutog zvezdana lako se otvaraju i seme se prosipa Å”to dovodi do gubitaka. Problem otvaranja mahuna u znaÄajnoj meri limitira uspeÅ”nu proizvodnju semena. Istraživani su eksplatacioni pokazatelji, kvalitet rada i pouzdanost starog univerzalnog žitnog kombajna 'Claas Mercator 50' u žetvi semena žutog zvezdana. Ispitivanje je obavljeno u poljskim uslovima Zapadne Sbije. Ustanovljeni su gubici na hederu i vrÅ”alici kombajna. Ukupni gubici hedera i vrÅ”alice na ispitivanom kombajnu iznosili su od 21,28% do 23,86% pri radnim brzinama 2,04 km/h i 2,63 km/h, Å”to se moglo i oÄekivati za pomenuti kombajn i ovu kulturu u uslovima poveÄane vlažnosti useva. Tokom rada kombajna dolazilo je do zastoja tj. zaguÅ”enja vrÅ”idbene mase, usled poveÄane radna brzina, vlažnosti semena i slame. UtroÅ”eno vreme za otklanjanje tehnoloÅ”kih zastoja kod radne brzine od 2,63 km/h bilo je veÄe nego kod brzine od 2,04 km/h i iznosilo je 13,48% od ukupnog radnog vremena. Intenzitet pucanja u toku dana zavisno od temperature je takoÄe bio predmet ispitivanja ovog rada. PoveÄani intenzitet otvaranja mahuna poÄinje posle 11 sati, pri temperaturi vaduha preko 30 0 C kada se otvori 80-90% mahuna vlažnosti od 17- 20%
Estimation of Biomass in a Submontane Beech High Forest in Serbia
The analysed submontane beech forest (Fagenion moesiacae submontanum B. Jov. 1976)
is situated in Eastern Serbia (Majdan-KuÄajna, compartment 33a). Stand area is 22.7 ha. Its altitude is
410-520 m and the slope is 7ā28Ā°. Parent rock consists of dense limestone, and the soil is
calcocambisol. The stand is uneven-aged, managed under group selection, with a volume percentage
of beech is 97%. Other statistics of the stand are: site class II, canopy closure 0.9, mean diameter
39.4 cm, and Loreyās mean height 31.0 m. For biomass evaluation, circular sample plots of 500 m2
size were used with the area intensity of 5%. While the aboveground biomass amounts to 337.69
tons/ha or 85.9%, belowground biomass makes 55.49 tons/ha or 14.1% of the total biomass. The
proportion of timber in the aboveground biomass is 89.7%, brushwood 9.3% and leaves 1.0%.
Estimation of biomass of the uneven-aged beech high forest was based on the results of investigations
on European beech in Central/Western Europe
Quality and Assortment Structure of Beech High Forests in Serbia
The paper presents research results on quality and assortment structure of uneven-aged
beech high forests in Central Serbia. Eleven representative stands of submontane beech forest
(Fagenion moesiacae submontanum B. Jov. 1976 ) and montane beech forest (Fagenion moesiacae
montanum B. Jov. 1976) were selected. Their altitude ranges from 450 m to 1350 m. Site class ranges
from I/II to III/IV, canopy closure from 0.7 to 0.9 and volume from 290 m3/ha to 522 m3/ha. Total area
of the stands is 241.9 ha. Sample plots of 500 m2 were established in a systematic grid of 100 x 100 m.
From silvicultural aspect, 16% of the standing volume (384 m3/ha) is class one, 39% is class two and
45% is class three. From the aspect of forest utilization 37% of the volume is class one, 34% is class
two, 19% is class three, and 10% is class four. In the assortment structure of the average stand volume,
industrial wood accounts for 42%, cordwood 48% and waste 10%. It has been concluded that beech
high forests in Serbia have unfavourable quality and assortment structure. This situation should be
improved in future by taking adequate management measures
Energetski potencijal produkata rezidbe voÄarskih i vinogradarskih zasada Srbije
Modern technologies of the fruit and wine production include implementation of the intensive plantation pruning where the accumulated considerable amounts of plant biomass residue have significant environmental and energy value. Thermal energy and the use of pruning residues as biomass are important from the point of view of environmental protection and the closed-cycle of CO2 emission and consumption. Remains of the pruning in the orchards represent a problem during the implementation of agricultural practices, so necessity for their disposal from these surfaces exists. Fossil fuel limited reserves and the environmental pollution impose the necessity of finding alternative and renewable energy resources with the environmental pollution reduction. Very important problem is to correctly define the optimal technical solutions and technologies for utilization of machine pruning of fruit trees and vines, which will increase the energy efficiency of the production. Outdated technologies, extensive production and inefficient consumption of energy in our country environment, haven't been helping in the suitable application of the collecting, preparing and using of the remains of the pruning. The prerequisite for the study of the economic and technical feasibility for the using of pruning residues (biomaterials) are the information about the quantity, the energy potential, the workmanship, the transportability, the price, the storage convenience, the preservation and the combustion. The essential starting point for this research is the annually definition of the energy potential of the pruning residues. .Savremene tehnologije voÄarsko-vinogradarske proizvodnje podrazumevaju sprovoÄenje intenzivne rezidbe zasada gde nastaju znatne koliÄine biljnih ostatka koji predstavljaju biomasu znatne ekoloÅ”ke i energetske vrednosti. Dobijanje toplotne energije i upotreba ostataka rezidbe kao biomase znaÄajna je sa stanoviÅ”ta zaÅ”tite okoline, zbog zatvorenog ciklusa emisije i potroÅ”nje CO2. Ostatci rezidbe u zasadima predstavljaju problem u sprovoÄenju agrotehniÄkih mera, tako da je neophodno njihovo iznoÅ”enje sa navedenih povrÅ”ina. OgraniÄene rezerve fosilnih goriva i veliko zagaÄenje životne sredine nameÄu potrebu iznalaženja alternativnih i obnovljivih izvora energije koji istovremeno smanjuju ekoloÅ”ko zagaÄenje. Veoma aktuelni problem predstavlja definisanje optimalnih tehnologija i tehniÄkih reÅ”enja maÅ”ina za koriÅ”Äenje ostataka rezidbe voÄaka i vinove loze, Å”to znatno poveÄava energetsku efikasnost ove proizvodnje. Zastarele tehnologije, ekstenzivna proizvodnja i neracionalno raspolaganje energijom, u naÅ”im uslovima, prikupljanje, obrada, priprema i koriÅ”Äenje biljnih ostataka nisu naÅ”li adekvatnu primenu. Preduslov za istraživanje ekonomske i tehniÄke opravdanosti koriÅ”Äenja ostataka rezidbe (biomaterijala) predstavljaju podaci o koliÄini, energetskom potencijalu, naÄinu obrade, transportabilnosti, ceni, pogodnosti za skladiÅ”tenje, Äuvanje i sagorevanje. NajznaÄajnije polaziÅ”te tom istraživanju je definisanje energetskog potencijala ostataka rezidbe na godiÅ”njem nivou.
Biological efficacy of the ecotoxically favourable insecticides and their mixture in the control of gypsy moth
Forest certification is one of the ways of adapting forestry to modern ideas of "sustainable management", by meeting demands of Forest Stewardship Council (FSC) standard. By joining this process, Serbia obligated to follow FSC pesticides policy. Almost all insecticides registered in Serbia and applied for control of the most dangerous outbreaking defoliating species in forests, are on the list of prohibited ones. In certificated forest ecosystems in Serbia, microbiological insecticides (active ingredient: Spores and protein-crystals of the bacterium Bacillus thuringiensis ssp. kurstaki) are most widely used pesticides for the control of one of the most important economically harmful defoliators - gypsy moths, in progragation phase, when the number of pests is relatively small. When the number is greater, it is assumed that the so-called "soft" ecotoxicologically favourable preparations Avaunt (R), Alverde (R), Coragen (R), registered for application in agriculture, but not in forestry can be used for inhibition of multiplication. Studies of biological efficacy of the aforementioned preparations and their mixtures with biological insecticide Foray (R) showed that they have preconditions for application in forest ecosystems. The high biologic efficacy, mechanism of action, resistance to water rinsing, high selectivity, and small quantities of application, anticipated a bright future for them. Since results of researches of biological efficacy of insecticides in laboratory and field conditions are statistically different, studies done in natural conditions should be favored
MRTVO DRVO U GOSPODARENIM BUKOVIM Å UMAMA NA PODRUÄJU SRBIJE
Dead wood in forests of Serbia hasn`t been studied so far, although it is an important component of forest ecosystems. This paper presents results of investigating volume, biomass, and carbon stock bound in the dead wood of beech high forests. The sample includes eleven pure beech stands selected in six forest regions. They are all uneven-aged stands that have been managed for the last several decades, mostly under selection or group-selection. Their site class is I/IIāIII/IV. The altitude ranges from 400 to 1380 m. One stand belongs to submontane (Fagetum moesiacae submontanum B. Jov. 1967) and ten to montane (Fagetum moesiacae montanum B. Jov. 1953) beech forests. A systematic sample was used to determine the presence, quantity, diameter structure of volume, and state of dead wood considering its degree of decomposition both in standing and lying position. Sample plots of 500 m2, at a distance of 100 x 100 m were used as elements of the sample. Altogether 242 sample plots were established. The volume of aboveground dead wood was determined by applying familiar dendrometric methods, while the dry biomass was calculated on the basis of its volume and wood density at different degrees of decomposition. The biomass of belowground dead wood i.e. roots of stumps and snags was obtained directly using the relevant regression equations. The quantity of the carbon bound in dead wood was calculated by multiplying dry biomass of dead wood by 0.5 coefficient. A simple and a stratified sample were used for the purposes of estimating the average and total volume, biomass, and carbon stock of dead wood. It was concluded that the average aboveground deadwood volume in all studied stands amounted to 19.24 m3 haā1. The aboveground biomass of dead wood was 6.06 t haā1 and belowground 17.34 t haā1, or 23.40 t haā1 in total. The carbon-bound stock in the total estimated dry biomass of dead wood was 11.70 t C haā1.U cilju rjeÅ”avanja problema energetske krize i klimatskih promjena u svijetu se pridaje veliko znaÄenje prouÄavanju biomase, odnosno zalihe i kruženja ugljika u Å”umskim ekosustavima. ProuÄavan je najÄeÅ”Äe utjecaj klimatskih promjena i naÄina gospodarenja na razvoj i stabilnost Å”umskih ekosustava, kao i njihov doprinos ublažavanju negativnih utjecaja klimatskih promjena na životni okoliÅ” (Cannell 1995., Lebaube et al. 2000., Joosten et al. 2004., Mund 2004., Mund and Schulze 2006., Liski et al. 2006). Mrtvo drvo je najviÅ”e prouÄavano u praÅ”umama, odnosno rezervatima bukovih Å”uma (Christensen et al. 2005). Uz to, prouÄavano je u približno prirodnim bukovim Å”umama (Beneke and Manning 2003., Mountford 2002) i u gospodarenim bukovim Å”umama (Green and Peterken 1997., Fridman and Walheim 2000., Ferguson and Archibald 2002., Mund 2004., Mund and Schulze 2006). RaÄena je i komparacija karakteristika mrtvog drveta u prirodnim ā negospodarenim i gospodarenim Å”umama (Andersson and Hytteborn 1991., Kirby et al. 1998). U Europi, volumen dubeÄeg i ležeÄeg mrtvog drveta u ureÄivanim ā proizvodnim Å”umama oznaÄena je kao važan indikator za održivo gospodarenje i oÄuvanje biodiverziteta (MCPFE 2003). Prema tomu, mrtvo drvo je važna komponenta Å”umskih ekosustava. MeÄutim, u Å”umama Srbije do sada nije detaljnije prouÄavano. Zbog toga, cilj ovog rada bio je dobivanje pouzdanih informacija o najznaÄajnijim karakteristikama mrtvog drveta (volumenu, biomasi i ugljiku) u visokim gospodarenim bukovim Å”umama koje su u državnom vlasniÅ”tvu.Istraživane sastojine bukve po strukturnoj su izgraÄenosti specifiÄne, a poÄetkom dvadesetog stoljeÄa bile su pretežito praÅ”ume, pa su neurednim prebornim sjeÄama prevedene u privredne Å”ume. Radi se o izrazito raznodobnim sastojinama bukve, specifiÄne starosne strukture. Uzorkom je obuhvaÄeno jedanaest Äistih sastojina bukve izabranih u Å”est Å”umskih podruÄja (Slika 1). Jedna sastojina pripada brdskoj (Fagetum moesiacae submontanum B. Jov. 1967) a deset sastojina planinskoj Å”umi bukve (Fagetum moesiacae montanum B. Jov. 1953). Klima je umjereno kontinentalna. PovrÅ”ina sastojina je 9,8ā32,3 ha (ukupno 241,9 ha). Bonitet staniÅ”ta je I/IIāIII/IV, nadmorska visina 400ā1380 m, prosjeÄan nagib terena 11ā27Ā°, najÄeÅ”Äa ekspozicija sjeverozapadna, stupanj sklopa 69ā94 %, srednji promjer po temeljnici 30ā42 cm, srednja visina po Loraju 22ā34 m, broj stabala 214ā308 po ha, temeljnica 22ā33 m2 haā1, volumen 290ā522 m3 haā1 i volumni prirast 5,0ā10,5 m3 haā1. Kvalitativna i sortimentna struktura istraživanih sastojina bukve bila je loÅ”a (Koprivica et al. 2010b).Za utvrÄivanje prisutnosti, koliÄine, debljinske strukture volumena i stanja mrtvog drveta glede stupnja raspadanja u dubeÄem i ležeÄem položaju primijenjen je sistematski uzorak. Kao elementi uzorka u sastojinama koriÅ”tene su probne plohe veliÄine 500 m2, rasporeÄene na rastojanju 100 x 100 m. Postavljene su ukupno 242 probne plohe. Volumen mrtvog drveta na probnim plohama iznad zemlje odreÄen je po klasiÄnim dendrometrijskim metodama, a suha biomasa na bazi njegovog volumena i gustoÄe drveta pri razliÄitom stupnju raspadanja (MarjanoviÄ et al. 2010). Biomasa mrtvog drveta ispod zemlje (korijena panjeva i suhih stabala) odreÄena je izravno po regresijskoj jednadžbi (Wutzler et al. 2008). Sadržaj vezanog ugljika u mrtvom drvetu dobijen je množenjem suhe biomase mrtvog drveta s koeficijentom 0,5 (IPCC 2003). Za procjenu prosjeÄnog i ukupnog volumena, biomase i zalihe ugljika primijenjen je jednostavni i stratifikacijski uzorak.ProsjeÄan volumen živog i mrtvog drveta iznad zemlje po hektaru u sastojinama i za sve istraživane sastojine zajedno prikazan je u tablici 2. Za sastojine dobiveni su podaci nedovoljne toÄnosti. MeÄutim, podaci dobiveni za sve istraživane sastojine zajedno su dovoljno toÄni ā pouzdani. ProsjeÄan volumen mrtvog drveta iznad zemlje svih istraživanih sastojina bukve zajedno (p = 0,95, n-1 = 241) je 19,24 +/ā 2,63 m3 haā1 ili 5,01 % od prosjeÄnog volumena živog drveta (383,9 +/ā 20,58 m3 haā1). Metodom analize varijance utvrÄeno je da je razlika izmeÄu sastojina, s obzirom na prosjeÄan volumen mrtvog drveta po hektaru, statistiÄki znaÄajna. Volumen mrtvog drveta s obzirom na naÄin javljanja i stupanj raspadanja prikazan je u tablici 5, a s obzirom na debljinsku strukturu volumena u tablici 6. Na osnovi jednostavnog uzorka od 242 probne plohe utvrÄeno je da je raspored mrtvog drveta iznad zemlje po hektaru jako pozitivno asimetriÄan i jako izdužen u odnosu na normalni raspored. Koeficijent varijacije je 108 %. Relativna greÅ”ka uzorka (p = 0,95) je +/ā 13,61 %. Primjenom stratifikacijskog uzorka dobivena je relativna greÅ”ka uzorka +/ā 13,01 %. Na osnovi stratifikacijskog uzorka, interval povjerenja (p = 0,95, n-4 =238) za prosjeÄan volumen mrtvog drveta je 16,74ā21,74 m3/ha. ProsjeÄna suha biomasa mrtvog drveta i zaliha ugljika po hektaru u istraživanim sastojinama bukve prikazana je u tablici 7. Biomsa istraživanih sastojina zajedno iznad zemlje je 6,06 t haā1, a ispod zemlje 17,34 t haā1, odnosno ukupno 23,40 t haā1. Zaliha vezanog ugljika u ukupno procijenjenoj suhoj biomasi mrtvog drveta iznad zemlje je 3,03 t C haā1 a ispod zemlje 8,67 t C haā1, odnosno ukupno 11,70 t C haā1.Gospodarene visoke sastojine bukve u Srbiji imaju veÄi volumen, biomasu i zalihu vezanog ugljika u mrtvom drvetu po hektaru u odnosu na intenzivno gospodarene sastojine bukve u Europi. SadaÅ”nje stanje je posljedica dugogodiÅ”njeg provoÄenja neurednog gospodarenja i Äeste promjene naÄina gospodarenja bukovim Å”umama (preborni, grupimiÄni, naplodni i sl.). Na bazi provedenog istraživanja procijenjeno je (p= 0,95, n-1 = 241) da se u visokim gospodarenim bukovim Å”umama na podruÄju Srbije (350.000 ha) nalazi 6,73+/ā 0,92 milijuna m3 mrtvog drveta iznad zemlje, Äija je suha biomasa 2,12 +/ā 0,29 milijuna tona a uskladiÅ”teni ugljik u ovoj biomasi 1,06 +/ā 0,14 milijun tona. Biomasa mrtvog drveta ispod zemlje je 6,07 +/ā 0,73 milijuna tona, a uskladiÅ”teni ugljika u ovoj biomasi 3,03 +/ā 0,36 milijuna tona. Prema tomu, ukupna procijenjena biomasa mrtvog drveta iznad i ispod zemlje je 8,19 +/ā 0,82 milijuna tona, a uskladiÅ”teni ugljik 4,10 +/ā 0,41 milijuna tona