Sökresultat:
304 Uppsatser om Norwegian spruce (Picea abies) - Sida 10 av 21
Rekreationsanpassad skötselplan för Skedalaskogen :
In this master thesis we suggest a recreational directed forest management plan for the
Skedalaskogen. The forest is situated 10 kilometres east of the city of Halmstad and is owned by the municipality.
We have in literature and in research investigated what people like and want in the forest, how to manage the forest for recreation according to for example tree species, mixtures and density. We tried to adapt the forestry methods more to recreational thinking. We have also looked at issues like what is rare and not rare in this part of the country according to nature and forest, where people live and which connection they have to the Skedalaskogen.
The Skedalaskogen is a quite big area, totally 830 hectares. The area have about 100 000
visitors a year.
Vindfällning i naturliga och skapade bryn och kanter :
The aim of this work was to study if the edge of the forest is more resistant to heavy winds than the trees located further in from the edge, and how this edge effect changes between different types of tree species and site types.
The data was collected from an electric power line going from the north to the south of
Sweden. The mean value of the clearcutted area around the power line was 120 meters. The
main direction of the storm in January 2005 was west-southwest and thus the power line was a perfect place for gathering a large data set.
The main parameter studied was the damage frequency at the edge of the forest compared to
the trees located further in from the edge (up to 100 m from the power line). Tree species mixture, soil moisture class, soil type, topography, stand height, stand height of the stand on the other side of the power line and wind exposition was estimated.
The results showed a distinct edge effect. The edge of the forest had clearly lower damage frequency for all tree species.
A marked difference was observed between tree species and damage frequency.
Undersökning av självspridning av contortatallen i norra Sverige
Over the past 40 years 600 000 ha of lodgepole pine (Pinus contorta ssp. latifolia (Engelm.) Critchf.) has been planted in Sweden (280 000 ha on SCA's forest land alone which represents about 15% of the company's total forest land area). In the early 70's SCA situated a number of experimental stands in order to investigate different aspects of the exotic tree, primarily growth rate. To be able to compare the two species plots with scots pine (Pinus sylvestris L.), this species was also planted at the same time and under the same conditions.
A number of questions should always be raised when exotic species are introduced in an ecosystem. Invasiveness, the pathogen situation and purely ethical issues should be discussed.
Pottaskeframställning och tjärbränning i Femsjö socken från år 1700 till 1900 :
Femsjö is a small parish situated in Hylte municipality, Växjö diocese. The parish has a total area of 8230 ha of which 5000 ha are covered with forest. There have not been any large industries in the parish offering work opportunities for the inhabitants, so they have had to generate income from their land and the forest. Instead of going to the bank to get a bank loan the people of Femsjö parish went out in to the forest and harvested trees for timber and extra cash revenue. Production of pine tar and potash were two other ways that the residents of Femsjö parish could earn extra money for the household in order to keep starvation away.
Härliga hagar och skrämmande skogar : om våra känslor för landskapet och vad de beror på
Do our imaginations of real landscapes get affected by works of art such as paintings, myths and literature? They often give very colourful descriptions in words as well as pictures. Do they actually change our feelings for the landscapes we are in and carry around as images inside?
Close your eyes and take a few deep breaths. Imagine that you are leaning against a wooden fence a mild summer evening.
Nyckelbiotoper - urskogsrester eller kulturprodukter? : beståndshistorik i tolv nyckelbiotoper i Lycksele kommun
Since 1993 the Swedish Forestry Administration conducts a nation-wide inventory of wood-land key habitats covering all forest land in Sweden. The inventory aims at mapping and describing habitats where redlisted species occur or can be expected to occur. According to the inventory stand history is crucial to the presence of red-listed species. However, the current knowledge of stand history in woodland key habitats is very limited.
The purpose of this work is to describe stand history in woodland key habitats, i.e. fire history, human activities - mainly cuttings - and structural changes.
Hur kopplad är asp till tidigare jordbruksmark? : en studie av aspförekomst och tidigare markanvändning i fem län i Mellansverige
Aspen (Populus tremula) is a tree that is important for biodiversity. It is a pioneer tree that is favored by much light. It is possible that aspens that regenerated on agricultural land have a different importance for biodiversity than aspens that regenerated in forests, since their conditions have been different. By studying how the land use have changed you can see how many of today?s aspens regeneretad on agricultural land.
Metaboliter från svampar associerade till granbarkborren (Ips typographus) och deras effekter på andra svampars tillväxt
Granbarkborren, Ips typographus, är den mest destruktiva skadeinsekten för svensk barrskog och orsakar årligen stora ekonomiska förluster för landets skogsägare. Granbarkborren kan endast föröka sig i döda träd. För att döda ett stående friskt träd kan de med feromoner signalera till andra granbarkborrar att tillsammans inleda en massattack. Granbarkborren är även beroende av blånadssvampar för att kunna slå ut friska träd. Med dessa blånadssvampar kombinerat med en massattack kan granbarkborren döda trädet inom några veckor.
Torrefaction of biomass : a comparative and kinetic study of thermal decomposition for Norway spruce stump, poplar and fuel tree chips
Stump biomass is energy rich and stump harvesting for use as fuel become more and more
interesting in Sweden. Swedish Forest Agency (2009) has estimated that stump harvesting in
Sweden would respond to an annual energy supply of 57 TWh/year. However, stump has not
been recognized as a bioenergy resource in Sweden. Suitable methods for pre-treatment of
stump are probably of great importance to make it accepted as fuel. It is therefore rewarding
to carry out an investigation in this area for stump.
This report represents results from a diploma project, which was aimed to develop a fixed bed
reactor for experimental study of biomass torrefaction, followed by TG analysis and kinetic
modelling employing Ozawa method and different kinetic models including one-step and
three-pseudo-component models.
Hållbarhetsredovisning - Till vem är den skriven?
Miljömedvetenhet är ett begrepp som används flitigt idag både i företagsvärlden och privat. Detta har lett till att kundernas medvetenhet om miljön och det sociala ansvaret har ökat och de ställer allt högre krav på företagens produkter och tjänster.Allt eftersom de bildas nya moderna företag ökar konkurrensen och många företag väljer att lägga stora resurser inom hållbar utveckling för att uppnå konkurrensfördelar. För att företagen ska kunna kommunicera sitt miljöansvar till omvärlden skapar dem en hållbarhetsredovisning där dem talar om sitt ansvar för omvärlden. De tre vanligaste ansvaren som man finner i en hållbarhetsredovisning är det sociala ansvaret, det ekonomiska ansvaret och miljöansvaret.Hur en hållbarhetsredovisning ska utformas är frivilligt och variationen gör att det kan bli svårt för ett otränat öga att tolka och jämföra informationen Vi tror att en stor del till variationen inom hållbarhetsredovisning är att företagen väljer att rikta sig till olika intressenter som dem finner intressanta för bolaget.Syftet med denna uppsats är att granska och tolka hållbarhetsredovisningarna från nordens tre största flygbolag; SAS, Norwegian Airlines och Finnair för att få svar på frågan till vem deras hållbarhetsredovisning är skriven.För att uppnå vårt syfte med uppsatsen har vi kopplat den information vi fått från bolagens hållbarhetsredovisningar till olika teorier för att skapa oss en uppfattning om företagen. Vi har då kommit fram till att bolagens hållbarhetsredovisningar lägger fokus och riktar sig till olika intressenter.
Friluftsgräset är grönare på andra sidan gränsen : en jämförelse av förutsättningarna för friluftslivsforskning i Sverige och Norge
AimThe purpose of this study is to compare and highlight the scope for research into outdoor recreational pursuits in Sweden and Norway. - What are the similarities and differences in the financing of research into outdoor recreational pursuits in Sweden and Norway?- What are the similarities and differences in forums for research into outdoor recreational pursuits in the two countries? Method The method that has been used in this study consists of qualitative interviews in conjunction with an examination of the published material on the subject. The qualitative interviews have been conducted with six key figures in the field of research into outdoor recreational pursuits in Sweden and Norway where the aim was to obtain a comprehensive overview of the research undertaken in both countries. The examination of the published material has been used to complement the interviews, primarily with information from propositions and reports from relevant organisations and authorities. Results Financing in Sweden is spread over several different research councils and authorities where no one organisation has an express responsibility for research into outdoor recreational pursuits. In Norway, however, The Research Council of Norway is the prime source of research funding.
Överlevnad och tillväxt för Douglasgran i södra Sverige
After the two big hurricanes called ?Gudrun? (2005) and ?Per? (2007) in the south of Sweden, some landowners planted Douglas fir instead of the traditional Norway spruce and Scots pine. They did it for different reasons. Some of them spreading their "risk", others because they wanted better growth or to obtain a more storm-resistant stand and trees more protected against rot. In this study, survival and growth were examined on Douglas fir in 21 different locations, owned by private landowners in southern Sweden.
Skötsel av ekholmar och eftersatta ekbestånd på låga boniteter : en fallstudie
This case study is made on assignment of Södra, region Öst, as a part of a campaign
promoting more active management of the oak forests in the region.
Hardwood trees of good quality, especially oak, has a high value due to that the sawn
material is highly estimated by the market. It is important that the Swedish oak forests
are managed in a proper way in order to meet the future demand. Södra has therefore
decided to increase the focus on oak in the Kalmar region and they would like to find
out if continues cover forestry (CCF) under certain conditions can be an appropriate
management model. The motive is to make use of the existing oak forests more
efficient, not just considering well managed forests but also the more neglected oak
forests, on poorer soils. Thus, the objective for this study is to examine if CCF is
appropriate method in the three stand types; broadleaved mixtures oak forest, oak islet,
and oak/spruce forest.
Existing management models were surveyed in the literature.
Environmental variables determining the occurrence of the red-listed Carbonicola anthracophila and C. myrmecina in boreal forests
The global biodiversity loss is mainly due to human activities such as an intensification of forestry. Boreal forest ecosystems in Fennoscandia are characterized by disturbances such as forest fires, storms and floods. However, industrial forestry practices suppress forest fires and change the landscape, leading to a loss of habitats and associated species. Particularly lichen species with slow adaptation abilities and a strong substrate specificity face an extinction debt in boreal forests since their substrates are long-lived but no longer created. In this study the species-substrate relationship of two red-listed forest-fire dependent lichen species Carbon-icola anthracophila and C.
Kommunismens ansikte : Skildringen av kommunismen som ideologi och kommunistiska regimer i svenska och norska gymnasieläroböcker under perioden 1951-2011
This paper presents an analysis of history textbooks used in schools in Sweden and Norway. The intention of the research was to study how the history textbooks describe communism and communistic dictatorship mainly during the cold war. The result of this study is that there were no big differences between Swedish and Norwegian history textbooks, but there are, however, some differences in how communism was described between the authors and also over time. Mostly, the books that were written in the post cold war period were somewhat more critical to communism in the eastern Europe (even thought they mainly handled with Stalin´s communism. And they also set quotationmark between Stalin´s communism and the nazi terror during World War two..