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402 Uppsatser om Descision Tree - Sida 27 av 27
Do 25 years old skid tracks restrict growth and survival? : a study on growth conditions for the planted regeneration in a rainforest rehabilitation project
The rainforests of the world are important not only to the countries in which they grow but to the world as a whole. They influence oxygen and water circulation as well as carbon sequestration which in turn affect global radiation and global warming. The forest also have great value and in Malaysia as in many other tropical countries large volumes are harvested which leaves great areas of degraded forest with little growth and biological diversity. Due to their low financial value these forests are often transformed and used for other purposes than forestry such as oil palm plantations.
The trees are often transported out of the forest using large bulldozers. They are heavy which causes compaction of the forest floor and during transport the top soil layers are moved to improve mobility.
Produktion och beståndsstruktur i fullskiktad skog skött med blädningsbruk
Denna studie behandlar tillväxt och beståndsstruktur samt sambandet mellan dessa i skog skött med blädningsbruk. Blädningsbruk förutsätter fullskiktad skog med fallande diameterfördelning, under nordiska förhållanden vanligtvis dominerad av gran (Picea abies (L.) Karst). Strukturen i fullskiktad skog är resultatet av tillväxt, skörd/mortalitet och inväxning. Kunskap om det komplexa samspelet mellan dessa faktorer ger skogsskötaren möjlighet att planera och sköta fullskiktad skog för en hög och uthållig produktion.
Undersökningar och litteratur inom aktuella områden tas upp i en litteraturstudie. Ämnen som behandlas är: definitioner och begrepp, diameterfördelningen i fullskiktad skog och hur denna kan beskrivas, blädning och andra avverkningsstrategier samt tillväxt- och produktionsundersökningar i Norden, Europa och USA.
Rosenlunds bankar : Erosion och förändring sedan 1960
During the 1960´s and 1970´s the number of grey seals in the Baltic Sea was decreasing rapidly, mostly due to hunting and toxic substances like DDT and PCB. When hunting became less intense and toxic substances decreased in the environment the grey seal population started to increase. Today grey seals are found common in the Baltic Sea and have started to become a big treat and a problem to the fishing industry. The grey seal destroys and enters fishing traps and consumes large quantities of the fish that have been caught.The knowledge of the grey seal, like abundance and food preferences, is today limited. It is also important to define the position of the grey seal in the ecosystem in the Baltic Sea and to be able to predict changes that could occur if the population would rapidly decrease or increase.
Födosammansättning hos gråsäl (Halichoerus grypus) samt test av flotte för insamling av sälfekalier.
During the 1960´s and 1970´s the number of grey seals in the Baltic Sea was decreasing rapidly, mostly due to hunting and toxic substances like DDT and PCB. When hunting became less intense and toxic substances decreased in the environment the grey seal population started to increase. Today grey seals are found common in the Baltic Sea and have started to become a big treat and a problem to the fishing industry. The grey seal destroys and enters fishing traps and consumes large quantities of the fish that have been caught.The knowledge of the grey seal, like abundance and food preferences, is today limited. It is also important to define the position of the grey seal in the ecosystem in the Baltic Sea and to be able to predict changes that could occur if the population would rapidly decrease or increase.
Välkommen : vackrare infart till Vilhelmina
The purpose of this thesis is to show how a good approach can be designed, focusing on the southern approach to the Swedish town Vilhelmina. Prior to the car being part of everyday life, the approach was a road where the town showed itself from the very best side. When the amount of traffic increased, so did noise and other disturbances, and as a consequence industrial areas replaced the residential buildnings at the approaches. Today, the pendulum is turning back and in recent years the approach is regarded as a place to introduce the town. The approach is also the place where cars should slow down from the speed of the main road to the speed of the city.
Rum, form och växter : en sammanställning av växtkompositionsprinciper och tillämpningar
Sammanfattning
Rum, form och växter är ett avslutande examensarbete som handlar om växtkomposition. Jag har valt ett antal profiler inom områdets principer om rumsskapande, komposition, färglära och några tillämpningar som jag studerat på plats samt gjort egna förslag.
I detta arbete har jag börjat med rummens uppbyggnad, deras förutsättningar och sammanhang och hur detta påverkar platsen. Formen och proportioner skapar olika upplevelser och inhägnaden som har betydelse för intrycket. Människor får olika känslor beroende på rummets öppenhet, slutenhet och skala.
Kapitlet som handlar om gångar berör uppbyggnaden och människans rörelsemönster i dessa.
Föryngringsresultat och beräknad virkesproduktion i naturligt föryngrade tallbestånd i Västerbotten under mitten av 1990-talet :
According to the Board of Forestry, in Västerbotten, many natural regenerations of Scots pine (Pinus sylvestris) carried out on privately owned forest in the middle of 1990 in Västerbotten have rendered a bad regeneration outcome and will provide a low future forest production. The Board of Forestry believes that the negative result can be explained by the fact that the regeneration has been carried out in wrong locations and that scarification failed to work as planned. In order for an accepted rate of regeneration the guidelines of the Forrest Act require, not less than 10 years after final cutting at natural regeneration, that there should be at least 1300 (site indices 16 m) - 1700 (site indices 20 m) main crop stems per hectare. Main crop stems are defined as stems according to the place of growth and appropriate tree type, in addition with regard to quality, stage of development and damage risk have a prospect of succeeding. In addition main crop stems should be separated by surface so that the proportion sample plots with 3 meters radius, and lack main crop stems, are not more than 10 % of site indices 14 meters or higher.
Vad påverkar skogsägarnas naturhänsyn vid föryngringsavverkning i region Mellannorrland? :
The objective of this thesis was to investigate what influence nature conservation measures taken at regeneration felling. Factors analysed were the forest owners´ situation and their characters, and information activities from wood-suppliers and the Regional Forest Board (RFB). The inventory was performed with a posted questionnaire followed up by telephone to forest owners and a posted questionnaire to wood-buyers.
The forest owners were grouped in three strata, depending on the quality results (D- polytax inventory) of the taken forest conservation measures, and for this investigation forest owners were sampled from the population in the tree groups. In total 73 % (41/56) of the sampled forest owners answered the questionnaire
Group A (17 answers): Good judgement
Group B (19 answers): Bad judgement
Group C (5 answers): This group was formed from the forest owners that were informed, by RFB, about nature conservation measures and culture history consideration before the regeneration cutting.
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?.
Kvickrotsstudier: 1. Kvickrotens reaktion på myllningsdjup, kvävemängd och kväveplacering i konkurrens med gröda. 2. Reducerad glyfosatanvändning på trädad åkermark :
1. Reaction on burial depth and nitrogen availability and placement in competition with a crop
In this trial it was investigated how couch grass (Elymus repens) changes its ability to compete in stands of wheat and barley with different burial depth and different amounts and placement of nitrogen. More knowledge in this area can be valuable in the attempt to decrease the use of herbicides and still keep the weeds under control.
The trial was carried out in the summer of 2004 as an outdoor pot experiment. The pots contained 15 litres of soil with a surface of 0,06 m2.
Näsbyholm - parken och de närmaste omgivningarna ur ett historiskt och nutida perspektiv
The goal of this work has been to search historical materials, to identify the park's historical development, to prepare proposals on measures and that work should be the basis for further research. The aim has been to train us in searching for and use of materials and to gain an understanding of the process of work with older plants. In the process we have sought and found materials in archives, through literary and oral sources, and email
contacts.
Because of its excellent location perched on an islet in the low landscape Näsbyholm was long a fortress. The old castle on Näsbyholm was from the late 1400s but the site was
fortified much earlier. The islet was at this time completely surrounded by water and there was a drawbridge over the narrow waterline.
The owners are liable since the late 1200s.
English Arts and Crafts gardens and how they can be modernised in Sweden
The aim with this thesis was to investigate what characterises an English
Arts and Crafts garden how they could be modernised in Sweden. My
research was limited to 20 weeks of full-time writing and worth 30 ECTS.
Through literature studies, interviews and site visits I could analyse my
findings which resulted in a concrete garden design project.
The Arts and Crafts was a movement that started in England during the
1880?s and evolved as a reaction towards the industrialisation. The influence
came from the writings and practices of John Ruskin (1819-1900)
and William Morris (1834-1896) who advocated the importance of craftsmanship.
The Arts and Crafts movement also became a ?recipe for life?
and was associated with a healthy and morally pure way of living.