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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
91

Granvirkes permeabilitet beroende av dess fysikaliska utformning och applicerat färgsystem

Johansson, Amanda January 2015 (has links)
Densitetsmätningar och permeabilitetstest enligt EN 927-5 har utförts för att studera huruvida granvirkes fysikaliska egenskaper i kombination med applicerat färgsystem påverkar permeabiliteten. De egenskaper som studerats är frod- och senvuxenhet, splint- och kärnved samt densitet. Aktuella färgsystem som studerats är alkyd, akrylat och linolja, vilka jämförts med omålad referens. Studien påvisar inget samband mellan virkets densitet och permeabilitet, bestruket eller ej. Det som istället tycks påverka vattenabsorptionen är närvaro av splint-/kärnved samt frod-/senvuxenhet. Senvuxen kärnved var den bestrukna vedtyp som absorberade mest vatten gällande samtliga färgsystem. Vedtyp som hade lägst vattenabsorption varierade dock. Linolja var generellt det färgsystem som gav lägst permeabilitet, främst på frodvuxen kärnved. Denna kombination hade lägst absorption genom hela försöket.
92

Paprastosios eglės Lietuvos provenencijų palikuonių produktyvumo ir kokybės palyginimas bandomuosiuose želdiniuose / Comparison of wood yield and quality of Lithuanian provenances grown in experimental plantation

Kaniauskaitė, Aistė 27 June 2006 (has links)
The purpose of the study was to evaluate the wood yield and stem quality of (Norway Spruce (Picea abies) provenances from Jurbarkas, Telšiai, Kaunas and Alytus and to assess the transfer effect. to Kaunas region. The problem was the following: incase of shortage of Norway spruce seeds in the local Dubrava forest enterprise, from where it would be profitable to introduce seeds? The object of the study: experimental plantation of Norway spruce in Vaišvydava forest district of Dubrava experimental forest enterprise established in 1995. Trees of four provenances are tested: Jurbarkas, Telšiai, Vaišvydava and Alytus. The total area of experimental plantation is 1.2 hectares. The work methods and technical means: the age of young trees was 11 years at the time of measurements. The following characteristics were measured: height young trees, the number of leader shoots, the straightness of stem, time of budburst (the beginning of the growth period). The height of trees was measured with telescopic measurement instrument; qualitative traits were evaluated according to the class scales used in the genetic research. The results were the following: It was established that the descendants of the provenance of Mociškiai were the tallest and of the best stem quality. The descendants of the provenance of Punia were in the second place by wood yield and quality. This advantage can be explained by good genetic quality of the tested material and the positive effect of transfer. The descendants... [to full text]
93

Seed orchards - genetic considerations on function, management and seed procurement /

Prescher, Finnvid, January 2007 (has links) (PDF)
Diss. (sammanfattning) Umeå : Sveriges lantbruksuniv., 2007. / Härtill 11 uppsatser.
94

High-stumps and wood living beetles in the Swedish production forest landscape /

Abrahamsson, Markus, January 2007 (has links) (PDF)
Diss. (sammanfattning) Alnarp : Sveriges lantbruksuniv., 2007. / Härtill 4 uppsatser.
95

Aspects of precommercial thinning in heterogeneous forests in southern Sweden /

Fahlvik, Nils, January 2005 (has links) (PDF)
Diss. (sammanfattning) Alnarp : Sveriges lantbruksuniversitet, 2005. / Härtill 4 uppsatser.
96

Growth allocation and stand structure in Norway spruce stands : expected taper and diameter distribution in stands subjected to different thinning regimes /

Karlsson, Kjell, January 2005 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniversitet, 2005. / Härtill 4 uppsatser.
97

Aspects of precommercial thinning : private forest owners' attitudes and alternative practices /

Fällman, Karin, January 2005 (has links) (PDF)
Diss. (sammanfattning). Umeå : Sveriges lantbruksUniversity. / Härtill 4 uppsatser.
98

Root associated fungi of conifer seedlings and their role in afforestation of agricultural land /

Menkis, Audrius, January 2005 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniversitet, 2005. / Härtill 5 uppsatser.
99

Responses of ectomycorrhizal fungi to changes in carbon and nutrient availability /

Fransson, Petra M. A., January 2001 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv., 2002. / Härtill 4 uppsatser.
100

Lignin degradation : long-term effects of nitrogen addition on decomposition of forest soil organic matter /

Sjöberg, Gudrun, January 2003 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv., 2003. / Härtill 3 uppsatser.

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