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Joint International Conference on Long-term Experiments ...

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The value of the spacing factor increases with each thinning, its value can modify with<br />

up to 5% at each break (Florescu I., 1998). The data presented as examples in the<br />

previous pages support our point.<br />

The simulati<strong>on</strong> of a low thinning is reckognised by the fact that tree number<br />

intensities of over 25-30% occur, while in what the basic area and the volume are<br />

c<strong>on</strong>cerned, they are situated between 5-10%, which is normal, if we take into account<br />

that trees from the inferior categories are removed, trees left behind with regards to their<br />

growth and placed in the lower c<strong>on</strong>tent. The remaining sessile oak or Turkey oak trees<br />

in the lower c<strong>on</strong>tent are declined at the tree-foot and they are the first to be<br />

recommended for extracti<strong>on</strong> through tending processes. The combined thinning implies<br />

the removal of the trees from all diameter categories, this can be noticed by the fact that<br />

number of trees, basic area and volume intensities, respectively, are aproximately equal,<br />

or differing by no more than 4 or 5%.<br />

REFERENCES<br />

1. Chiţea Gh., 1997, Biostatistică, Editura Universităţii Transilvania, Braşov<br />

2. Chiţea Gh., 2001, Biostatistică, Editura Universităţii Transilvania, Braşov<br />

3. Cristea Maria, 2004, Riscurile climatice din Bazinul hidrografic al Crişurilor,<br />

Editura Abaddaba Oradea<br />

4. Florescu I., Nicolescu N., 1998, Silvicultura, vol. I – Silvobiologia, Editura<br />

Universităţii Transilvania, Braşov<br />

5. Florescu I., Nicolescu N., 1998, Silvicultura, vol. II – Silvotehnica, Editura<br />

Universităţii Transilvania, Braşov<br />

6. Giurgiu V., 1979, Dendrometrie şi auxologie forestieră, Editura Ceres, Bucureşti<br />

7. Giurgiu V., 1972, Metode ale statisticii matematice aplicate în silvicultură, Editura<br />

Ceres, Bucureşti<br />

8. Leahu I., 1994, Dendrometrie, Editura Didactică şi Pedagogică, Bucureşti<br />

9. Leahu I., 2001, Amenajarea pădurilor, Editura Didactică şi Pedagogică, Bucureşti<br />

508

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