Träds sociala status inverkan på grundytetillväxtökningen undersöktes genom jämförelse av grundytetillväxten efter gallring med motsvarande stammars grundytetillväxt i en ogallrad kontrollyta. Datat kommer från fyra olika provytelokaler ur de svenska gödslings-/gallringsförsöken, där behandlingarna bestod av ett gallringsprogram med en kraftig gallring, ett med tre klenare gallringar samt en ogallrad kontrollyta. Datat täckte en utvecklingsperiod på ungefär 40 år. Stammarna delades vid första mättillfället in i fem klasser utifrån diametermedelstammen och dess tillhörande standardavvikelse på respektive yta, därefter utfördes undersökningarna på de stammar som fanns kvar efter sista mättillfället. Vid den sista mätningen fanns enbart de tre största klasserna kvar i tillräcklig utsträckning i alla behandlingar och resultatet omfattar därför bara dessa klasser.

During the period called Little Ice Age (1400 ~ 1900) the climate of northern Europe was in an annual year-basis overall colder than it was before and after that period. The numbers of short, cold and rainy summers and long, bitter-cold winters where often repetitive under the approximately 500-years the period lasted. In Scandinavia, the coldest time during this period is estimated to have started around the end of the 16th century and lasted to the beginning of the 18th century. Trees growing at the tree-line are limited by temperature for their annual growth and hence showing differences of growth during changes in the climate,  a method called dendroclimatology. The variations of growth can be read in the tree-rings either by analyze the width of the ring or by look into the density of the wood and is used to reconstruct past climates.

Large amounts of birch-timber are imported to Sweden, from particularly the Baltic States, since the domestic production can?t support the pulp industry. The goal of this study was to show the potential of birch and the area?s most suitable for birch production. The study was limited to Gävleborg County. Using site characteristics, site index (SI) for birch was estimated on all National Forest Inventory plots in Gävleborg County.

Booth for operational planning of harvesting and for long term planning, data is today collected manually. Intensive objective field inventories are usually too expensive. To enhance optimisation of timber flow from forest to industry Moore efficient methods for measuring tree stems of standing trees are needed. The performance of terrestrial laser scanners have improved and these could possibly be used within forestry in the future. The objective of this study was to validate how a terrestrial laser scanner could be used to measure stem diameter, and to test how the errors depend on distance from the scanner and tree species. Two plots (one pine and one spruce) were used for this study.

The modern silvicultural practices of today, with cutting by compartments, have led to a large benefit for the moose population through the cleared areas which produces large amount of fodder. This new landscape can produce and feed a large moose population. But it will cause a conflict effect towards the landowners; the conflict consists of browsing mainly in the young pine forest. The result from browsing and damage will be sparse stands with reduced growth and technical damage like leader shoot browsing, stem breaking and damage of the bark. Technical damage can kill the tree or damage it so hard that it would not work as future saw timber.

The use of renewable resources is rapidly increasing in Sweden, especially the use of fuel pellets. Through pelletizing the energy content per volume unit is greatly increased and the pellets are more homogeneous with regard to moisture content, particle size and density compared to unrefined fuels like forest residues and chips. For further development of the Swedish pellet industry, the use of different assortments from lodgepole pine (Pinus contorta Dougl. var. latifolia) is of particular interest, mainly because of its high volume production.

Since the 1950s, the development of modern rotation forestry in boreal Fennoscandia has resulted in a severe reduction of older forests, and a high degree of fragmentation among the small patches that remains of old forest. In Sweden, when performing conservation value assessments in order to identify and preserve the remaining forest habitats, the government authorities use to a significant extent a set of indicator species that indicate habitats of high biological conservation value. One species considered to indicate high conservation values in pine-heath forests is the red-listed ectomycorrhizal (EM) macrofungi Sarcodon scabrosus (Fr.) P. Karst. In the present study, the validity of using S.

A new type of forest tree seedling, called mini seedling, has been developed by the University of Dalarna in Garpenberg, Sweden. Compared to traditional containerized seedlings that are grown for 1 ? 2 years, mini seedlings are grown for only 10 weeks. The mini seedlings are small, easily planted, cost effective, and reduce the amount of chemicals used in the nursery. Research has shown that mini seedlings tend to have higher overall survival rates than traditional container seedlings.

I Västerbotten täcks den produktiva skogsmarken till 44 % av tall. Tallar bildar kärnved, men anledningen till detta är fortfarande oklar. Det antas dock innebära fördelar att bilda denna typ av ved. Kärnved består av döda parenkym och epitelceller, medan splintveden innehåller levande celler. Kärnveden innehåller även olika typer av extraktivämnen samt fenoler.

Tree fiber lengths controls properties like strength and smoothness in paper and other wood products. For forest researchers it is of interest to be able to determine the fiber lengths in standing trees. Mo?rling et al. (2003), among others, have developed methods to estimate fiber length distributions in standing trees without damaging them.

Tree fiber lengths controls properties like strength and smoothness in paper and other wood products. For forest researchers it is of interest to be able to determine the fiber lengths in standing trees. Mo?rling et al. (2003), among others, have developed methods to estimate fiber length distributions in standing trees without damaging them.

Uppsats för avläggande av filosofie kandidatexamen i Kulturvård, Landskapsvårdens hantverk, 15 hp, 2015.

Kravet på användning av förnyelsebara energikällor ökar, år 2020 ska de stå för 50 % av all energianvändning. För att öka utbudet av skogsbränsle och utveckla bränslekedjan i hållbar riktning måste ny kunskap och teknik utvecklas för intensivodling av snabbväxande trädslag på skogsmark. Mot denna bakgrund har ett trädslagsförsök anlagts i södra Sverige, med syftet att på sikt besvara frågorna kring intensivodling av skog. Avgången hos plantor är som störst under de första åren efter plantering för att därefter plana ut vid cirka 10 års ålder. Överlevnaden under föryngringsfasen beror i hög grad på vilken utsträckning snytbaggar förekommer samt vilka åtgärder man vidtagit för att få så bra etablering av plantorna som möjligt. Syftet med studien var att undersöka överlevnaden, skador och höjdutvecklingen för de ingående trädslagen tall, gran, björk, hybridasp och poppel, 1 till 2 år efter plantering. Resultatet visade en lägre överlevnad andra året jämfört med första året. Detta berodde delvis på en okänd skada hos poppeln, som troligtvis också hade inverkan på höjdutvecklingen.

I dagens skogsbruk bedöms gallringsbehovet utifrån gallringsmallar som ger rekommendationer baserade på avvägningar mellan biologisk kunskap, ekonomiska faktorer och risker. Gallringsmallarna är anpassade efter tänkta produktionsskogar och kan således vara bristfälliga i andra fall. Därför behövs en effektiv bedömningsmetod som fungerar i både homogena och heterogena bestånd. Studier har visat att tallens (Pinus sylvestris) grönkronandel har påvisad effekt på diametertillväxten och genom att uppskatta denna kan ett direkt mått ligga till grund för bedömning av gallringsbehov, istället för det indirekta måttet grundyta, som nuvarande gallringsmallar är utformade efter. Tanken är att undvika produktionsförluster genom att gallra innan grönkronan hissats upp alltför mycket.

Insecticides will be removed from Swedish forestry, at present insecticides are used to treat our seedlings to avoid them from being attacked by pine weevils. With the forthcoming ban on insecticides alternative protective measures will have to be tested. Holmen Forest Ltd has aimed to find an alternative and have developed a mechanic pine weevils protection accessory as well as a new concept on planting pipes. Studies have been conducted on the behalf of Holmen Forest Ltd to see how planting with the newly developed mechanical protectors and plant pipe stands up against the conventional methods used today. The study was conducted over a three week period. Three factors were compared regarding planting quality including i) pressure around the plant, ii) the depth the plant ended up in, iii) plant angle. Mechanical plant pipes were used in the study, and where tested like a one-handed and a two-handed pipe. The study concludes that further development is needed for the mechanic plant protector to live up to the speed and quality of conventional methods.