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UTICAJ PROREDA NA STANJE, STABILNOST I PROIZVODNOST KULTURA -BELOG BORA (PINUS SILVESTRIS L.) NA BUKOVOM STANIŠTU
INFLUENCE OF THINNINGS ON STATE, STABILITY AND PRODUCTIVITY OF SCOTS PINE (PINUS SILVESTRIS L.) PLANTATIONS ON A BEECH SITE
Dražić, Milutin
Ratknić, Mihailo
Bratić, Vlatko
Čokeša, Vlado
The Scots pine plantation was established in the years 1956-1957 by planting in the furrows plowed up on the isohypses, on the site of mountanous beech with Lusula (Fagetum montamim Lusuletosum), on a skeletal acid brown soil on Paleozoic schists - argiloschists. On the experimental plot the combined schematic- selective thinning was made of two intensities: moderate intensity 22.2 - 27.4% and high intensity 30. 1 - 35.8% trees from the total tree number. The thinnings were made in the years 1975, 1981 and 1987. The analysis of elimination of spontaneous dying out of trees has shown that on the control parcel 29.2% of all trees, present at the beginning, were eliminated, on the parcel with moderate thinning 9.8% and on the parcel with heavy thinning 3.9 %. The investigation of productivity has shown that the mean age increment on the control parcel was 8.93 m3/ha, on the parcel with moderate thinning 9.87 m3/ha and on the parcel with heavy thinning 10.59 m3/ha. At the same time the current annual increment for the period 1975-1987 was 8.33 m3/ha on the control parcel, 10.63 m3/ha on the parcel with moderate thinning and 12.45 m3/ha on the parcel with heavy thinning. The analyses of diameter of the mean stand tree aiid of mean three of dominant layer show that with the increase of thinning intensitiy they also attain larger dimensions, what means that heavier thinnings, in the concrete case, contribute to the optimal wood production in a shorter rotation period. The applied thinning intensity had no negative influence on the stability of stands, since there were no big damages of snoubreak and other abotic factors.
srpski
1988
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