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ŠUMARSKI LIST 9-10/2011 str. 21     <-- 21 -->        PDF

J. Čavlović, K. Teslak, A. Seletković: PRIMJENAI USPOREDBA PRISTUPAPLANIRANJAOBNOVE ...Šumarski list br. 9–10, CXXXV (2011), 423-435
(E_DEL_REN, E_DOB, E_OG), define the influence on sustainable forest
management and to indicate limitations and possible future improvements of
pedunculate oak forest management planning. The forest research site was the
management class of pedunculate oak within the management unit “Josip Kozarac”.
Total area of the oak forest (3,690.8 ha) is divided into 321 p. oak
stands (11.5 ha average area). Mostly old stands, and a few young and middle
aged stands, with intensive regeneration during the last 20 years are the characteristics
of age class distribution (Figure 1).

Based on the model of rent difference (Eq. 1, Table 1), potentially mature
oak stands (older than 100 years) were classified in six categories of regeneration
priority (Table 2, Figure 4, Map 2). Stands to be regenerated in the next
10-year period (265 ha planned regeneration area) were selected on the basis
of the rent difference model and stand age model in relation to forest management
plan and spatial distribution (Map 3, Map 4), and the structural-qualitative
characteristics of the selected stands (Table 3) were compared.

Results showed that under stocked stands, younger than 120 years and on
average smaller areas, have greatest priority, while stands with high-quality
structure, older than 135 years and larger average areas, have least regeneration
priority. Regeneration of 21 of the oldest and structural highest quality
stands would lead to the highest yield of 73 million kuna, but also to the highest
indirect and long term losses. On the other hand, yield of 47 million
kunas and at least long term and indirect losses would the result of an approach
based on the rent difference model, while actual planning partly considers
the demands of long term sustainable management.

The characteristics of the situation and management in the studied forest
site represent similarities which exist (on a wider scale ) in the entire pedunculate
oak forest area in Croatia. With regard to planning and management,
due to the large share of mature stands with unfavorable structure and quality,
comprehensive and complex demands of stand regeneration are necessary on
the one hand, in order to ensure gradual and long term improvement of the forests,
and, on the other hand, to ensure essential income for current management.
Although, there are considerations of long term sustainability on the
operative level of stand regeneration planning, open questions should be answered:
what is the minimal level of achieving long term forest management
demands, and to what extent the level is obtainable and sustainable, as well as
what the projections are for future management periods. New information on
mature pedunculate oak stands obtained from the rent difference model could
be applied as supplement and support for the current approach of stand regeneration
planning. Further development of the complex and dynamic spatial-
temporal projection model would provide abundant information describing
the current state of forest resources and management, relations between influencing
factors, limitations and demands of management, as well as possible
future developments. Application of the system would improve planning and
management efficiency, as prerequisites of sustainable forest management,
within the framework of a wider, strategic, level of decision making and its appropriate
transfer to the operative levels of forest management.

Key words:pedunculate oak, forest management planning, rent, planning
of regeneration felling, regeneration priority, stand structure