Báo cáo khoa học: Preliminary results of common oak (Quercus robur L) provenance experiments

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Preliminary results of common oak (Quercus robur L) provenance experiments...
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Báo cáo khoa học: "Preliminary results of common oak (Quercus robur L) provenance experiments" Original article Preliminary results of common oak (Quercus robur L) provenance experiments in Croatia Gracan J Forest Research Institute, Jastrebarsko, Cvijethno Naslje 41, 41420 Jastrebarsko, CroatiaSummary — The first experiment with 16 provenances of Quercus robur L from Croatia was estab-lished in the nursery of the Forest Research Institute in Jastrebarsko in the spring of 1986. Field ex-periments with 4 randomized blocks in 2 localities were laid out in 1988. After 5 years (1990), theSpacva provenance performed best in terms of height growth. Survival varied from 34.0% (Moto-vunska Suma at Slavir) to 98.5% (Gunja at Gajno).provenance / Quercus robur / height growth / survival / CroatiaRésumé — Résultats préliminaires de plantations comparatives de provenances de chêne pé-donculé (Quercus robur L) en Croatie. La première comparaison de provenances de Quercusrobur L de Croatie a été mise en place dans la pépinière de l’Institut de recherches forestières deJastrebarsko au printemps 1986. Elle comprend 16 provenances. Les tests en forêt ont été installésdans 2 stations; chacune comprend 4 blocs randomisés. À l’issue de la cinquième année de végéta-tion, la provenance Spacva s’est avérée la plus vigoureuse (croissance en hauteur). Les taux de sur-vie varient de 34% (provenance Motovunska Šuma dans la station Slavir) à 98,5% (provenanceGunja dans la station Gajno).provenance / Quercus robur / croissance hauteur / surviel / Croatie enINTRODUCTION seedlings from forest nurseries (Dokuš and Komlenovi&jadnr;, 1979; Androi&jadnr;, 1987; Prpi&jadnr;, 1987). Considering these facts,Common oak (Quercus robur L) is one of very im- sources are proper provenancethe most valuable and the most important portant (Komlenovi&jadnr; al, 1988). The etforest trees in Croatia. The value and main natural range of Quercus robur inquality of the wood of the famous Slavoni- Croatia is along the Sava river (45° lati-an oak is well known in Croatia and in tude), about 400 km long. The total wood-world markets. However, difficulties with land area of Quercus robur in Croatia isnatural regeneration and forest decline re- 170 000 ha containing 40 million m of sol- 3quire more extensive production of oak id wood (Kova&jadnr;i&jadnr;, 1990). Seed from 12 provenances was sown in the Oak provenance research was started nursery of the Forest Research Institute at Jas-in 1985-1986. The purpose was to study trebarsko in the spring of 1986. The experimentvariability and wood productivity of differ- laid out in with 4 randomized block design was aent provenances in Croatia. It is very im- from each blocks, using 20-25 kg of acornsportant for forestry practice to determine provenance/block. The seedlings were grown inwhich oak provenances are productive the nursery for 2 years until the autumn of 1987.and most suitable for different forest re- Heights were measured in the autumns of 1986 and 1987. Survival was assessed in the autumngions (Gra&jadnr;an, 1986). of 1987. Field experiments of 16 oak provenances ...