Naslov
SD simulation model as support in management of uneven-aged stands with irregular structure and absence of recruitment

Autori
Čavlović, Jure ; Dubravac, Tomislav ; Benko, Miroslav

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Uneven-aged Forest Management:Alternative Forms, Pactices and Constraints / METLA, Finnish Forest Research Institute - Helsinki : METLA, University Helsinki, Swedish University, 2003, 15-21

Skup
IUFRO International Interdisciplinary Conference and field Tour in Finland and Sweden

Mjesto i datum
Helsinki, Finska, 08.06.2003. - 17.06.2003

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
SD model; uneven-aged stand; increment; silver fir; beech

Sažetak
Selection management plays a very important role in the forestry of Croatia.Within the area of selection forests, Gorski Kotar takes up a special place as the most forested part of Croatia boasting of beautiful selection forests of fir and beech.Gorski Kotar can be said to have a very long and complex history of managing its forests.The Management Unit Belevine, part of the teaching-experimental forestry facility Zalesina of the Faculty of Forestry in Zagreb, is a good representative of selection forests in Gorski Kotar.The aim of this paper is to present the management and regulation of uneven-aged stands management using the SD model.Recruitment, transition of trees from one diameter class into another, increment, mortality and cutting are presented as basic processes in the SD model of uneven-aged stand dynamic system (Čavlović 1996).The structural elements of an average selection fir and beech stand such us:number of trees by diameter classes, volume of an average tree of a given diameter class, time of stem transition within a specific diameter class are entered in the SD model as the initial state.By use of an uneven-aged stand SD model, it is possible to establish the future development of the structure of the uneven-aged stand as well the cutting structure in the terms of volume and quality based on the assumed cause-effect relations between recruitment, increment and cutting.Since cutting in the course of the future period isthe effect of the initial structure and state of the stand, special attention is paid here to the cutting dynamics and structure.More intensive cutting in the first cutting cycles as well as no less than 88% of cut mature fir growing stock, confirm this assumption.The results show clearly how long it takes for a process to establish the expected and normal uneven-aged structure after its disruption.Gradually, in the course of a 50-year period, the effects of the disrupted structure(surplus of mature growing stock, absence of recruitment)were being eliminated.As far asthe investigated forest is concerned, it si questionable how long it shall take to achieve the expected normal selection structure(satisfactory number of trees of medium thickness).

Izvorni jezik
Engleski

Znanstvena područja
Šumarstvo, Biotehnologija

POVEZANOST RADA