Določanje velikosti in oblike krošnje s pomočjo krošnjemera : diplomsko delo - visokošolski strokovni študij

Čarman, Rok (avtor), Smrekar, Andrej (avtor), Kotar, Marijan (mentor), Kadunc, Aleš (komentor)

V nalogi smo preizkusili dve metodi za izračun volumna in površine krošenj pribukvi in smreki. Prva metoda temelji na pripomočku, imenovanem krošnjemer, s pomočjo katerega smo volumne in površine krošenj izračunali po sekcijah, druga pa na izračunu volumnov in površin krošenj na osnovi geometrijskih teles. V vzorec smo zajeli 60 dreves bukve in 40 dreves smreke. Izračune volumna in površine na osnovi geometrijskih telesih smo primerjali z izračuni pridobljenimi po sekcijah drevesa. Ugotovili smo velika odstopanja v izračunih, predvsem pri bukvi v sončni krošnji, katerega krošnja ponazarja kubični paraboloid. Pri smreki se izračuni bolje ujemajo. Pri obliki krošnje smo uporabili kazalce njene oblike, za katere smo predpostavili, da se z debelino dreves spreminjajo. To se je pokazalo pri večini kazalcev, pri vseh pa ne. Pri ugotavljanju odvisnosti med debelinskim prirastkom in parametri krošnje smo ugotovili, da pri bukvi senčna krošnja pomembneje vpliva na debelinski prirastek, kot pa sončna krošnja, pri smreki pa je ravno nasprotno.V nalogi smo primerjali tudi dejanske višine dreves z višinami, izmerjenimi s krošnjemerom in višinomerom Sunnto ter ugotovili, da se napaka znaraščanjem višine dreves povečuje, odvisna pa je tudi od mikroreliefa.

• Jezik: Slovenski jezik
• Ključne besede: krošnjemer, volumen krošnje, površina krošnje, bukev, Fagus sylvatica, smreka, Picea abies, oblika krošnje
• Vrsta gradiva: Diplomsko delo
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: BF - Biotehniška fakulteta
• Kraj izida: Ljubljana
• Založnik: [R. Čarman, A. Smrekar]
• Leto izida: 2007
• Št. strani: X, 55 str. + 28 str. pril.
• PID: 20.500.12556/RUL-15411
• UDK: 630
• COBISS.SI-ID: 1892774
• Datum objave v RUL: 11.07.2014

Sekundarni jezik

• Jezik: Angleški jezik

Izvleček

We tested two methods for measurement of the volume and surface of beech and pine tree crowns. The first method is based on an instrument called crown window, by means of which the volumes and surfaces of crowns were measured in sections, whereas the measurement according to the other method is based on geometric shapes. The sample comprised 60 beech and 40 spurce trees. The measurements of the volume and surface on the basis of geometric shapes were compared with the measurements made by the sections of the tree. We found major discrepancies in the measurements, especially with the upper, sun-exposed part of the beech tree crown, which is illustrated by a cubical paraboloid. The measurements tally to a greater extent with the pine tree. We assumed that the indicators of the shape of the crown that were used would change with the thickness of the tree; however, this is only true of certain indicators. When establishing the interdependence of the increment and the crown parameters, we realized that with the beech tree the upper, sun-exposed crown more strongly influences the increment than the lower, shady part of thecrown, whereas it is just the opposite with the spurce tree. We also compared the actual heights of the trees with the heights measured with the crown window and height meter Suunto and we found out that the differencies gets bigger with the growing height of the tree; the mistake also depends on the microrelief.