Age class method applied in growing stoks highly exceding in overaged-exploitable stands: A case study. | Aplicarea metodei claselor de vârstă la fonduri de producție puternic excedentare în arborete exploatabile: un studiu de caz

English. This paper aims to find optimal planning solutions for the management of high forests, designed to produce regular wood assortments andfacing with a significant surplus of exploitable stands. In production unit III Șoimu from Tazlău Forest District, the surplus of exploitable stands, determined in relation to forest area, evolved during 1994-2014 from 78.2% to 107.6% of the size of the normal periodic area although, in the same period, the allowable cutting volume increased by 41% (from 13100 to 18500 m3 an-1). Given the difficulties of leading the real growing stock structure to the structure of the normal growing stock, 10 different normalization scenarios have been proposed. Their comparison permitted determining the pattern of normal structure that allows the fastest diminishing of exploitable stands excess and a substantial diminution of exploitability sacrifices in the next 60 years. It has been found that the best scenario corresponds to a rotation of 100 years, divided into four periods, as follows: two periods of 30 and two periods of 20 years. Thus, compared to the solutions provided by current management plan, in the identified scenario, after the first 20 years the growing stock already reaches a small deficit of exploitable stands and, after about 60 years, it reaches a structure very similar to the normal one. In contrast, according to the solutions provided by the current forest management plan, it is estimated that normalization of the growing stock will be achieved in at least 120 years and the exploitability sacrifices will be significantly higher. In addition, periods characterized by high excess of exploitable stands will alternate with highly deficitary periods in exploitable stands and, over about 90 years, the allowable cutting volume will be about 65% lower than the normal one.

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