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458 Uppsatser om Retention trees - Sida 27 av 31

Analys av individinriktad ekskogsskötsel i Blekinge : en metod för tillämpning i ett kontinuitetsskogsbruk?

Ett ökat brukande av skog enligt skötselprinciper som leder till skiktade beståndsstrukturer, en blandad trädslagssammansättning och kontinuerligt skogbeklädd mark har potential att öka den biologiska mångfalden och värdet för rekreation (Emborg m.fl. 2000, Berg m.fl. 1995, Mattsson & Li 1994, Holgen m.fl. 2000). I ljuset av detta, tillsammans med svårigheterna som finns att nå goda ekonomiska resultat vid skötsel av ädellövskog (Lindén & Ekö 2002), ses det idag som angeläget att uppmärksamma och studera alternativa skogsskötselmetoder (Cedergren 2008) . I östra Blekinge har ett antal skogsägare under längre tid praktiserat en metod att sköta naturligt föryngrad ek i blandbestånd som går ut på att, mer eller mindre tidigt, frihugga ekhuvudstammar, och att dana kvalitet genom stamkvistning/beskärning.

Gallringsinventering från helikopter utrustad med profilerande laser och kamera för låghöjdsfotografering

Today Holmen Skog finds and selects suitable thinning stands using data on upper height and basal area. These figures are often based on basic forest data that has been updated with the help of growth prediction models. The problem is that these figures are not always correct. The aim of this study was to investigate if a combination of data from a profiling laser and a digital camera for low elevation photography, can be used for collecting data on number of stems per ha, tree species mixture as well as basal area weighted mean height and upper height for stands. The possibility to use these data to assess the need for thinning cutting was also investigated.Laser data and aerial photographs were collected from a helicopter operating at an approximate height of 100 meters.

Träd och buskar i kantzoner : en undersökning av kanteffekter i några av östersjöregionens skogar

Around the world, forests are generally being fragmented and as plant populations decline in both sizeand number of individuals, the genetic variation will also decrease whitch in the end leads to totalextinction of the plant. In this paper, I wanted to investigate what specific species of trees and shrubsyou usually find in the edge and core habitats in some of the forests in the Baltic Sea region. I alsowanted to identify the edge effects and their sources and finally compare the results between thedifferent regions.The data sources used are derived from the ongoining research project Landscape structures, patterns ofbiodiversity and conservation strategies in the Baltic Sea region by Kari Lehtilä, Patrik Dinnétz ochTiina Vinter who have made a record of all herbaceous plant species in four randomly chosen forestregions situated around the Baltic Sea: Estonia, Skåne, Södermanland and Germany. I made statisticalanalyses, using the computer program R, concerning the distribution of species in the edge habitats ofthe forests as well as in the core habitats. I performed generalized linear models and then variationanalyses with the factors light and biomass in order to investigate wether edge effects might appear dueto these factors.

Sakrättsliga anspråk och obligationsrättsliga invändningar i kontraktskedjor : Vindikation och retention

Förmögenhetsrättens allmänna del består av två delar, sakrätten och obligationsrätten. Denna allmänna del hanterar problem som är gemensamma för olika typer av avtal. Problemen som uppstår berör ofta både krav på betalning och krav på egendom varför det är av vikt att se till både obligationsrätten och sakrätten.Den typ av avtal som utreds i uppsatsen är depositionsavtal, vilka är föga reglerade i lagtext. Handelsbalken, där deponering delvis är reglerat, kan upplevas som svårförståelig för gemene man eftersom texten inte förändrats sedan sjuttonhundratalet. Deponering av gods förekom dock redan på den tiden och på grund av det är lagtexten fortfarande fullt tillämpningsbar.

S:t Sigfrids granne : en begravningsplats för alla

This paper is about cemetaries in a multireligious society. The aim of the work is to compare the physical expressions of different religions burial traditions, in order to plan a multireligious cemetary in Borås. I´ve studied the five worldreligions, Judaism, Chritstianity, Islam, Buddhism and Hinduism. I´ve also written about the Humanism, a nonreligious organization, and funerals without any religious connection. Litterature studies gave basic knowledge about the religions beliefs, and interviews with a person from each group deepend the knowledge, mainly regarding the burial traditions.

Hägn i skogsbruket :

This survey was made during the autumn of 2002 and the beginning of 2003, on commission from the National Board of Forestry. The purpose with the survey was to gather experience and knowledge in the organisation about fencing and this was made through interviews. The ambition was also to get knowledge from people outside the organisation that have great experience of forestry and fencing. The interviews were based on questions that have been composed by the author with help from the supervisors. The questions were the same to both the personal from the National Board of Forestry and to the foresters. Interviews were also made with private landowners, gamekeepers, game researcher, the County Administrative Board, the National Road Administration, pole and net retailers and contractors. The target group for this work is the National Board of Forestry to be forwarded to persons interested in forestry with the ambition to spread knowledge about how to prevent damage on the forest by browsing animals. The deer populations are big in the south of Sweden and growing populations have increased the damage on plantations of broadleaves of the most species.

Påsköns stenstatyer, moai : Vilket genus representerar de?

Abstract.The question in this analysis is which gender moai, the big statues on Rapa Nui, represent. My hypothesis is that they have developed from visual symbols to metaphores in mythologies from an polynesian context. That these statues were symbols for human origin and creation of ancestors ideological power, and gods in consideration male gender. In the long isolation, in both time and space, the mytologies in Rapa Nui was changed, and the pictures got a new meaning. These changes depended on clearing of wood and big trees and the following difficult situation in farming.

När isen smälter : En studie i konsten att behålla säsongsanställda vid ICEHOTEL AB

Att ha en relativt låg personalomsättning är en väldigt viktig del av ett företags välmående, i ett säsongsbaserat turistföretag är det i mångt och mycket en grundpelare för fortsatt framgång. För att lyckas med att skapa en lägre personalomsättning måste företagens avdelningar arbeta mot samma mål. Ett steg i framgången är att fokusera sina strategiska val på rekryteringen och upplärningsprocessen för de nyanställda. Dock kan inte företag nöja sig med att göra långsiktiga planer för dessa delar utan måste även fokusera på personalens trivsel och välbefinnande på arbetsplatsen, det är detta som skapar en lägre personalomsättning i en långsiktig plan.Personalomsättning i stort är ett relativt välutforskat område och det har eskalerat sedan mitten på 1990-talet. Forskarna har kommit fram till att det är bra med en låg personalomsättning men vad som inte kommit fram är hur företag praktiskt ska göra för att minska den.

Ahmed, Adam och de asatroende : En undersökning av två samtida skildringar av offer i den fornnordiska religionen

This essay takes its start in the problematic situation concerning source material in the study of the Norse religion before the Christianization of Scandinavia. There is a lack of written sources from the time when the religion was still practiced. There are plenty of archeological sources economic situation than their religious beliefs. The Icelandic stories written in the 13th and 14th centuries give us a broad pictureof the Norse mythology, but the writers were Christians which makes their reliability questionable.The focus of this essay is therefore on two texts written during the time when the Norse religion was still in practice. The first source is the travel notes written in 922 by the Muslim scholar Ahmad ibn Fadlan who met a group of the Rus? people.

Rhododendron ur undersläktet Vireya - något om dess karakteristika och användning i nordiska vinterträdgårdar :

Present essay aims to introduce the reader to central topics regarding Rhododendrons of subgenus Vireya. As a result of a donation, the Swedish University of Agricultural Sciences, received a collection of Vireya from a local amateur grower, Kurt Myllenberg. Since the subgenus Vireya is uncommon in Scandinavian horticulture, the study tries to establish conditions for successful growing. The subgenus Vireya differ from the other Rhododendron species through mainly three characteristics: the presence of two tails, attached to each end of the seed; the ovary-style junction is tapering and the pedicels arises directly from a dome-like base and form an umbel and not a raceme. The subgenus is distributed mostly in the islands of Indonesia and New Guinea, but also from Malaysia to Nepal and in Australia. Since Vireya species mainly grows as epiphytes in the tree canopies, they need high drainage and not too much water.

Handen bakom Vegeholms engelska park - en studie av parken och dess uppkomst

A boom in horticulture characterized the 18th century in Sweden and Skåne. Parks and gardens were gradually built out to become, at the end of the 18th century, large and comfortable facilities which responded to European parks. During the late 1700s the new fashion came to Sweden. In Sweden it was named ?the English style? which directly refers to the English expression ?Romantic style?.

Död ved i gallrad skog och nyckelbiotoper : en jämförelse av habitatkvaliteter för vedlevande lavar och mossor

A high amount of dead wood is one of the most important prerequisites for high biodiversity on forest land in Sweden. Dead wood is most abundant in young forests, thinned forests, woodland key habitats and protected forest land. In old-growth forests most of the dead wood consists of logs and snags, whilst in managed forests a huge proportion of dead wood is made up of logging residues like stumps and FWD, fine woody debris (< 10 cm diameter). All these different types of dead wood may serve as substrates for epixylic bryophytes and lichens. However, few studies have been conducted on the relative importance of these different fractions of dead wood for the occurrence of bryophytes and lichens, especially when considering dead wood on thinned forest land.

GIS-modellering av habitat för vitryggig hackspett (Dendrocopos leucotos) som hjälpmedel i naturvårdsplanering på landskapsnivå :

The white-backed woodpecker is a forest bird being critically endangered in Sweden. The species is dependent on older forests rich in deciduous trees and dead wood. The main problem for the survival of this species is present shortage of habitat. Conservation work on this umbrella species is at present focused on finding remaining or emerging habitat networks. Large areas are scrutinized in search for suitable habitats to be protected or managed for the species sake.

Ekologisk landskapsplan för fastigheten Götebo 1:5 :

This thesis constitutes a long term (100 year) ecological landscape management plan for the estate Götebo 1:5. The estate is situated close to Gothenburg and is owned by Skogssällskapet. The planning has been made by dividing the estate into different areas (zones). In each zone one of the goals nature conservation, recreation or economical yield has been prioritized. Nature conservation is one of the main goals for the forest management plan.

Mekaniserad ungskogsbehandling för röjning och skörd :

Earlier attempts at mechanising pre-commercial thinning have been met with varying degrees of success. Most attempts have been based on techniques where residual stems are straddled. Early treatment is essential to limit damage on residual trees. One part of the present study is an evaluation of mechanised pre-commercial thinning using the new Vimek 404R. Vimek 404R is a fairly small machine that permits selective removal of stems, making it potentially suitable also for areas overdue for pre-commercial thinning. The study established the level of performance for the machine, as well as the improvement needed to make it an economically viable option.

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