Joint International Conference on Long-term Experiments ...

THE SIMULATION AND EVALUATION OF A BREAK IN MIXED
STANDS OF BEECH WITH SESSILE OAK
Sorin Dorog
Faculty of Environmental Protection, University of Oradea
ABSTRACT
The work discusses the simulation and evaluation of a break for mixed stands of sessile
oak(Quercus petraea) with beech(Fagus sylvatica). Through this break, the structure of
the stand is modified and, to this extent, the work wants to establish the optimal
structure through successive simulations.
The structure of the stands offers complex information with regards to the
programme and the future development of the stand, thus, knowing the structure and the
way the break influences it, becomes very important. This paper analysed the
experimental distributions, obtained on the basis of the field data , in comparison with
those recommended in other works of speciality (normal distribution, Charlie’s
distribution and Beta distribution).
Key words: structure, distribution, mixed stands, beech, sessile oak
1. INTRODUCTION
The structure of the stands is the one that gives the most complex information about the
programme of the stand and about its future development, if essential
changes(unexpected) do not occur, changes that can modify entirely the initial
programme. In this way, knowing the structure of the stands becomes extremely
important, also from the perspective of the future breaks. In order to have a point of
refference, this paper analysed experimental distributions, obtained from the field data,
in relation to the distributions recommended in other works.
Applying different silvotechnical measurement systems influences not only the
size of the growth, but also the quality of the wood production, that is the relationship
between the volume of thick or thin trees, belonging to different species – which are
harvested and of various quality and also the efficiency of the social and ecological
functions, that the stands have to fulfill (Leahu I.,2001). Considering as representative
for this area the even-aged mixed stands or relatively even-aged stands of beech with
sessile oak, we will try to define the stands in connection with the proportion of the
species and also with the structure of the stands on diameter categories.
The simulation of the break offers information about the direction upon which the
stand has to be taken in order to improve its composition, structure, the optimal
functioning of its given attributes and its guidance towards the domestic aims,
established through a management plan.
2. WORKING METHOD
To evaluate the structure of mixed stands of sessile oak with beech, some stands were
selected, stands which vegetate in proper conditions with regards to environmental
conditions for the two species mentioned above.
The stands were chosen so that situations, in which they were partially or totally
derrived, would be avoided. The field was devised in rectangular test areas of 2.500 sq.
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