Sökresultat:
3373 Uppsatser om Fast growing tree species - Sida 39 av 225
En skogshistorisk jämförelse mellan två närbelägna landskap med olika mångfald i östra Småland :
This study shows the historical development of the forests in Hornsö and Ebbegärde state forest area in eastern Småland situated in southern Sweden..
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.
Svampar associerade med raps : betydelse för uppkomst och grödetablering
Oilseed rape is an important crop in Sweden and is grown on about 90000 ha today. The interest in oil seed pro-duction is increasing because of growing demand and high prices for oil seed both in Sweden and Europe. However, an increased intensity in the oil seed production can bring higher risk of yield losses due to fungal diseases. The purpose of this study was to investigate what different fungi are associated with oilseed rape under field conditions and if their incidence is correlated to crop establishment problems.
This study was carried out in three parts: 1) investigations on fungal community structure in roots and rhizosphere soils from young spring- and winter rape plants sampled in failed respectively good establishment patches in four fields, 2) investigations on the pathogenicity of fungi isolated from oilseed rape in controlled environment and 3) investigations on the effect of different fungicide seed treatments on germination and early plant development in a field soil naturally infested with damping off- and Verticillium wilt pathogens.
The studies on community structure using a combined approach of standard fungal isolation techniques and DNA based methods revealed a high fungal diversity in three out of four studied fields of spring rape and winter rape. For some unknown reason, very few fungal species were identified from the fourth field.
Jämförande studie av normal ERG-svar hos tre olika hundraser :
The purpose of this study was to compare normal electroretinographies (ERGs) from three different canine breeds in order to evaluate if there were any marked similarities or differences between these breeds as to ERG responses. It is known that healthy dogs from different breeds but also dogs within the same breed but in different age categories may have different appearances of their ERG responses. This may be a problem when evaluating if an ERG is normal or not from a dog within a breed not previously examined. Because of this it is important to obtain normal values for each breed and age group in order to be able to use these for later comparisons of ERGs obtained from individuals affected with various retinal diseases.
In this study we have chosen to examine dogs within the three breeds: Labrador Retriever (LR), English Springer Spaniel (ESS) and Chinese Crested Dog (CCD). All of these breeds may be affected with hereditary retinal diseases such as Progressive Retinal Atrophy (PRA).
It is possible that ERG-responses vary due to a number of different factors.
Södras gröna skogsbruksplaner ur ett landskapsperspektiv :
The aim of the "Green forest management plans" is to help forest owners to reach the
environmental goal of the forestry act. But are they able to do that? Is it possible to plan preservation of species on single estates? How do single-estate-plans differ from a landscape analysis and how can the landscape approach be used in operative planning? This work was initiated to give an answer to these questions.
This study was made in a landscape of 4200 ha in Östergötland county, south-eastern Sweden. A lanscape analysis was made and then compared to the Green forest management plans in the same area. The nature conservation areas (areas that were set aside to be managed with environmenatl goals) differed quite a lot between the two alternatives.
Djurparkernas tillgänglighet av information och dess innehåll: är den tillräcklig?
The purpose of zoos has changed over the decades. From being menageries where wealthy people showed their collections of exotic animals to today?s zoos where science, conservation and education has become a central part of their work. Education in zoos gives them the opportunity to spread the knowledge about ecology, biology and biodiversity to the general public. Their aim is to change the public?s attitudes towards our wildlife and raise awareness about the threats that exists against our planets biodiversity.
Fast etableringsställe : Platsen för tillhandahållande av tjänster vid fasta etableringsställen i olika medlemsstater
Denna studie avser att besvara var mervärdesbeskattning sker, ur ett EG-rättsligt perspektiv, vid tjänstehandel till en beskattningsbar person med flera fasta etableringsställen i olika medlemsstater. Tjänsterna förvärvas vid den plats där den beskattningsbara personen har etablerat sätet för sin ekonomiska verksamhet men tillhandahålls den beskattningsbara personens olika fasta etableringsställen. Studien företas med anledning av rådets direktiv (2008/8/EG) av den 12 februari 2008 om ändring av direktiv 2006/112/EG med avseende på platsen för tillhandahållande av tjänster (EUT L 44, 20.2.2008 s. 11-22).Utgångspunkten för att besvara studiens syfte är huvudregeln i artikel 44 mervärdesskattedirektivets ändrade lydelse som träder i kraft den 1 januari 2010. Artikeln stadgar att platsen för tillhandahållande av tjänster till en beskattningsbar person ska vara den plats där denna person har etablerat sätet för sin ekonomiska verksamhet.
Utsatta barn i förskolan : Pedagogers erfarenheter av och kunskaper om att hjälpa barn i missbrukande familjer till en god självkänsla
AbstractThe purpose of my study is to examine the experiences and opportunities to support teachers in preschool to help children in vulnerable environments, a good self-esteem. Hindberg (1999) writes that of all children today are growing up in Sweden, so ten percent live in families where there is abuse. According Pousette (2011) as the National Public Health Institute has a new appreciation for families where there is hazardous and this means that drinking or abused so much that it can become an addiction. They appreciate the investigation that twenty percent of all children in Sweden are growing up in these conditions.The results show that teachers' work is about building a sense of security in the children, both the teacher and the environment. It also shows that teachers believe that it is important to work with the self-esteem of all children, but especially children living in abusive families.
Clear-cut and substrate characteristics important for the occurrence of the beetle Upis ceramboides
Disturbances, such as fire and wind, are important for saproxylic beetles (= beetles depending on decaying wood) to gain substrate in boreal forests. Clear-cutting is an example of a man-made disturbance. Measures such as prescribed burning have been made to resemble natural disturbances. The aim of this study was to see which clear-cut characteristics are important for the occurrence of the saproxylic beetle Upis ceramboides.
This is a species favored by open habitats and is said to respond positively to forest fires. The distribution area in Sweden for this species has decreased during the last two centuries and I wanted to see if there were differences between clear-cuts in Hälsingland, where it is very
rare and decreasing, and Norrbotten where this study was conducted.
Elevers identitetsskapande : En studie om elevers olika identiteter/roller i skolan
AbstractThe purpose of my study is to examine the experiences and opportunities to support teachers in preschool to help children in vulnerable environments, a good self-esteem. Hindberg (1999) writes that of all children today are growing up in Sweden, so ten percent live in families where there is abuse. According Pousette (2011) as the National Public Health Institute has a new appreciation for families where there is hazardous and this means that drinking or abused so much that it can become an addiction. They appreciate the investigation that twenty percent of all children in Sweden are growing up in these conditions.The results show that teachers' work is about building a sense of security in the children, both the teacher and the environment. It also shows that teachers believe that it is important to work with the self-esteem of all children, but especially children living in abusive families.
Några vanliga ogräs : en litteraturstudie av arternas biologi samt förebyggande och direkta kontrollåtgärder
The Swedish Board of Agriculture initiated this undergraduate thesis. There is a database on their homepage that includes chemical treatments for different weed species. There is also space for preventive and mechanical control methods. This is an undergraduate thesis that reviews these control methods for the most important weeds in Sweden.
The species reviewed are:
Creeping perennials:
Common Couch Elytrigia repens (L.) Desv. ex Nevski
Creeping Thistle Cirsium arvense (L.) Scop.
Perennial Sow-thistle Sonchus arvensis L.
Field Horsetail Equisetum arvense L.
Colt's-foot Tussilago farfara L.
Stationary perennials:
Dock Rumex L.
Mugwort Artemisia vulgaris L.
Dandelion Taraxacum F.
Autenticitet i ett öppna data-sammanhang : Utmaningar och möjligheter ur ett arkivvetenskapligt perspektiv
By tradition, archival sciences has emerged in a context with defined information processes, with explicit information producers and custodians to which consumers make requests for the information. In this process, the archival science has developed methods and strategies to preserve authentic and reliable records and by that providing trustworthy information. In an online society, people are using the internet to get information for different purposes. Even though there is no legal obligation to guarantee the authenticity, it is of societal importance that the end users get trustworthy information. In this online context, open data is a trend that is growing fast over the world and it is interesting because its conditions raises many questions regarding authenticity.Since open data is free to reuse, link and combine with other information, and it is preferably in primary format it raises questions about how to maintain the integrity and identity of the information, which is the constituents of authenticity as it is used in this work.
Smittskyddsrutiner vid flytt av djur mellan djurparker
Animals in zoos live in small enclosed areas. If a pathogen is introduced to the zoo, the animals are extremely vulnerable. The highest risk of introducing new pathogens occurs when new animals are introduced to the collection. Therefore it is essential that zoos have a protocol in place for disease prevention.
This review has studied literature on the subject of disease prevention protocols when translocating animals between zoos.
Nöjescentrum : en fallstudie av upplevelsekonsumtion!
The society today, reflects a high welfare, where the human being has a better financial position than before. This has generate that more money is spend on pleasure and events. A result of that can be the development of a new line of business; The industry of experience.This kind of branch is fast growing in the Swedish labour market. The characteristics of this branch are, depending of trends, continuous variations and integrated education.A new phenomenon within this branch is ?Centre of experience?.
Individuell tillväxt och substratval hos en lokalt differentierad population av Asellus aquaticus
Local differentiation may occur during a short period of time and is part of the formation of new species. The isopod Asellus aquaticus is an example of a species in which local adaptation has occurred during a short period of time. An establishment of stonewort (Chara spp.) vegetation in Lake Tåkern (in the 2000) resulted in two different Asellus ecotypes; a lighter pigmented, smaller one that lives among stoneworts grazing periphytic algae, and a darker, larger ecotype that feeds on decaying leaves in reed (Phragmites australis vegetation. The purpose of this study was to examine whether there are differences in growth between ecotypes, depending on whether the food was periphytic algae or leaves, and to study the choice of substrates between the two food types. For the study, animals from both habitats were brought in from Lake Tåkern to the laboratory.