DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 3-4/1960 str. 32 <-- 32 --> PDF |
THE STUMPAGE PRICE OF THE RESIN AND THE ECONOMIC JUSTIFICATION OF RESIN-TAPPING Summary The stumpage price of the resin represents the value of the losses of the stand brought about by tapping — i. e. the decrease of volume and quality increments as well as of minor forest products yields (mainly litter) — to which one should add also the corresponding part of costs for the re-establishment of the tapped stand. This stumpage price should be calculated as accurately as possible for each intensity of wounding the tree (tapping method) as well as for the definite Pine species. The calculated stumpage price of the resin will be smaller if under the equal intensity of wounding the tree the average annual resin yield per one tree is increased. This can be achieved by keeping permanent and ever improving crews as well as by applying adequate techniques and biological methods (heterosis, grafting etc.) If the stumpage price of the resin cannot be realized in properly calculated amounts, then the tapping has not its economic justification and should be wholly discontinned or restricted to those trees not yielding technical assortments of high utilization value. The stumpage price of the Aleppo-Pine resin should be lower than the calculated one of other Pine species (Austrian Pine and others) for the average annual resin yields of the latter ones are lower than those of the Aleppo-Pine, their stemwood value being higher. Long-term tapping diminishes more the utilization value of tapped trees (stemwood) than tapping to death. Therefore trees yielding high-grade assortments are allowed to be tapped to death several years before their being felled, but also for this resin one should realize an adequate stumpage price calculated on the basis of the decreasing of the stand volume and quality increments brought about by this method of tapping. LITERATURA: 1. Ing. Bićanić Branko: Potrajnost smolarenja u Dalmaciji, Uređenje borovih šuma, Š. L. broj 6-7/1959. 2. Ing. Dudić Milan: Povećanje prinosa borove smole pomoću smeše hlorovodične kiseline i kalcium hlorida, — Šumarstvo br. 11-12/54. 3. Ing. Meštrović Rudi: Smolarenje (Prilog za rješavanje problematike) — Split 1956. 4. Ing. N!ikolić Sreten: Neka aktuelna pitanja smolarenja u NR Srbiji, — Šumarstvo broj 7-8/1958. 5. Oudin A.: Stimuliranje proizvodnje smole prskanjem rastvora sumporne kiseline (Izvještaj o eksperimentima 1947—1950.) — Prevod iz Revue forestiers frangaise broj 2/1952. 0. Prof. Dr. Plavšić M.: Kalkulacija cijene (šumske takse) sporednih šumskih proizvoda, — Zagreb 1958. 7. Ing. Terzić Dušan: Prinos smole crnog (P. nigra Arn.) i belog (P. silvestris L.) bora primenom francuske, nemačke i novoaustrijske metode smolarenja, — Sarajevo 1956. 8. Seminar o gajenju šuma putem femelšlaga održan 1957. godine u Jugoslaviji, — Izvještaj eksperta H. Leibundguta, — Beograd 1958. |