The distribution of Heterobasidion annosum in Scots pine stands in Nemenčinė Forest Enterprise, Mera and Magūnai forest districts were examined in this Master thesis. The object of the study: Scots pine stands that were established on formerly used agricultural land, former tank range areas and the stands growing in the cut areas of mature stands. Also, the Scots pine stands where after partly clear sanitation cuttings the birch groups were planted, in purpose to avoid the disturbances of Heterobasidion annosum. The aim of the study: to summaries the information about the distribution of Heterobasidion annosum in Lithuanian forests; to study the distribution of Heterobasidion annosum in Scots pine plantations established in agricultural lands and the cut areas of mature stands. The evaluation of the effectiveness of earlier used partly clear sanitation cuttings against Heterobasidion annosum in disturbed stands was also done. Methods: the distribution of Heterobasidion annosum in the forests of Nemenčinė Forest Enterprise, Mera forest district was evaluated visually. Each studied plot was evaluated according 4 grades. 6 assessment plots in Magūnai forest district were evaluated for the effectiveness of partly clear sanitation cuttings. The stand characteristics of the remained healthy pine and birch trees were measured using standard silvicultural mensuration methods, taking the measurements of each tree at breast height, in 2 cm precision. The results: The distribution of... [to full text]

Magistro darbe tiriama paprastosios eglės vidinio puvinio įtaka medienos savybėms . Darbo objektas – eglės mediena, kuri buvo paimta iš VĮ Prienų miškų urėdijos 15 kv 25 skl., 49 kv 15 skl., Veisėjų 3 kv 7 skl., Šilutės 2 kv 7skl., 11 kv 12 skl., 19 kv 6 skl., 33 kv 3 skl., 147 kv 4 skl. Darbo tikslas – ištirti paprastosios eglės vidinio puvinio įtaką medienos tankio ir stiprio savybėms. Darbo metodai – tirtuose eglės bareliuose visi medžiai buvo patikrinti prietaisu „ARBOTOM“, kuris matuoja garso sklidimo greitį medienoje ir pateikia erdvinį garso greičio stiebe vaizdą. Garsas sveikoje ir puvinio pažeistoje medienoje sklinda skirtingu greičiu. Vėliau atsitiktiniu būdu iš visų medžių, kuriuose prietaisas parodė vidinį puvinį, buvo atrinkti ir nupjauti medžiai. Radus puvinį buvo paimta kelminė atpjova 50 cm ilgio tolesniems tyrimams. Ruošiant bandinius, iš atpjovų buvo išpjauta centrinė (einanti išilgai per šerdį) 60 mm storio išpjova, kuri supjaustyta į sluoksnius. Medienos fizinės ir mechaninės savybės nustatytos LAMMC Miškų instituto medienos laboratorijoje ir slėnio „Nemunas“ medienos naudojimo, kokybės ir apdirbimo technologijų laboratorijoje. Vykdant medienos stipruminių savybių bandymus, naudota 5 tonų galios bandymų mašina P – 5. Duomenų sisteminimas ir jų analizė atlikta, naudojant statistinių duomenų tvarkymo paketą Microsoft Excell. Darbo rezultatai: atlikus tyrimus nustatyta, kad Prienų urėdijos eglės branduolio puvinio įtaką medienos tankiui, išryškėjo, jog... [toliau žr. visą tekstą] / In this master thesis was researched internal rot of Norway spruce (Picea abies) and its impact to woods characteristics. The object of this work: wood of Norway spruce (Picea abies), which was taken from Prienai state-owned forest enterprise (therefore SOFE) 15 quarter 25 plot, 49 quarter 15plot,Veisiejai SOFE 3 quarter 7 plot, Šilutė SOFE 2quarter 7plot, 11 quarter 12plot, 19 quarter 6 plot, 33 quarter 3plot, 147 quarter 4 plot. The aim of this work is to research the inner rot influence of picea abies to wood density and strength properties. The methods: all spruce in research area were checked with device called “ARBOTROM”, which measures sound speed in wood and shows spatial sound speed view in a steam. Sound in healthy and rot wood differs. Randomly were selected and cut down all trees, which according to the device had an inner rot. After the rot was found a 50cm length tree stump sample was taken for the further research. During preparation of samples there was prepared the central 60 mm thick cutoff (lengthways the core) and shredded to layers. Physical and mechanical wood properties were defined in LRCAF Forest Institute for timber laboratory and in “Nemunas” valley, timber quality and technology lab. For a wood strength property testing was used 5 ton test machine P-5. All data was systematized and analyzed by using Microsoft Excel. Results: after researching Norway spruce kernel rot effect to wood density, was discovered, that wood samples with inner rot from... [to full text]