136 uppsatser · sida 3 av 10
The main purpose of this study is to investigate the needs of pre-commercial thinning on private owned forest properties, which is considered to be increasing. The reason is believed to be the high cost of labor that pre-commercial thinning brings. Furthermore thinning is …
In Sweden, harvesting pre-commercial thinning (PCT) stems for energy purposes is a interesting way of financing the high cost of preparing dense stands for a profitable first conventional thinning. This concept can be labelled bioenergy thinning. The aim of this study was to …
… studies of wind damage in thinned stands indicated the importance of early thinnings. The risks of wind throw increased by increasing age and height of the stands. Previous studies also indicated increasing risk of wind throw along the strip roads. The aim of the present study …
en systemanalys av effekter från avverkning till levererad virkesråvara
… the timber has to be as efficient as possible. Increased length of pulpwood in thinning is one conduct that can result in higher productivity and/or lower costs. The study is scaled as a system analysis with the aim to exemplify the differences between working with 3- and …
… to that Bergvik and StoraEnso has started a new handling strategy of how to do thinning forest and they developed a new thinning mould based on over height & numbers of stems. The purpose and goal in this study was to make a comparing between laser data and traditional field …
… differences between withdraw of forest fuel and withdraw of pulpwood in first thinning, to see which method gives the maximum profitability (income - cost). Another purpose is to investigate the economic impact of the thicket cleaning. The study compares four different methods …
Det finns en rad satt att beskriva gallringsformen. Ofta används begreppet gallringskvot i dessa sammanhang utan att närmare ange vilken metod eller definition som använts for att beräkna den. Detta kan lätt leda till att missuppfattningar uppstår. Denna studie belyser olika …
… area, regeneration felling, soil scarification, planting, precommercial thinning, thinning, and change of ownership. This study has been done as a master's thesis for a master of scince in forestry at the Swedish University of Agriculture Sciences during the academic year …
en jämförelse efter stormen Gudrun
… no such trend. Spruce had increased wind damages with increased numbers of thinning. Larch however, showed no significant relationship between wind damages and number of thinning. The local comparisons between larch and spruce showed that the selection of the material agreed …
besökares upplevelser i norra och södra Sverige
… north and south of Sweden were noted. Above all, management like precommercial thinning were positive for recreation value. Also the introductions of old trees in the young forest were positive and thick dimensions of birch. The visitors by Härlanda tjärn were also positive to …
… harvester-forwarder) productivity when harvesting forest fuel in first thinning stands that contains Lodgepole pine and calculate the economy of the harvesting work and estimate the quality of the thinning . The field study area where located near Arvån, about 15 kilometres …
… used together with upper height to determine the need for pre-commercial thinning or ordinary thinning cutting. Aerial photo-interpretation was conducted in 2007 on assignment of Stora Enso Skog AB. A mean height function based on stand age produced with data from Bergvik Skog …
… investigate the economical result of removing undergrowth trees before first thinning, and a follow-up of the contractors and their compliance with Mellanskog standards. This thesis work was divided in three parts: The first was to find a relation between the net volume from the …
… investigate the economical result of removing undergrowth trees before first thinning, and a follow-up of the contractors and their compliance with Mellanskog standards. This thesis work was divided in three parts: The first was to find a relation between the net volume from the …
beräkningar med massaslutenhet
… remote sensing study of an area-based method used to detect forest in need of thinning by use of laser data and field samples. Only pine-dominated forest has been included in the study and height limits were set to match empirical restrictions. The study area was in the …
