The purpose of this study was to analyze the two thinning models: Bergvik Skog´s thinning model, which is based on total stems and dominant height, And Swedish forest agency´s thinning model which is based on basal area, habitat index, dominant height and recommended number of stems at final felling in Heureka´s StandWise and PlanWise. The data we chosen for our study were taken from the Swedish National Forest Inventory and we were creating a simulated stand based on a great number of sample plots in Region three from The Swedish National Forest Inventory. We had chosen to create one stand with low habitat index (T20) and one with high habitat index (T24). Our purpose were to come as close as possible to a natural stand in central Sweden. We performed the thinning in StandWise and analyzed the data I Excel files. Our thinning optimizing´s were performed and analyzed in PlanWise. There wasn´t any big differences between the thinning on the lower habitat index.

A secondary and a pioneer tree species can with advantage be included in a mixed stand to increase the use of sunlight. Nitrogen-fixing plants have been shown to increase the supply of nitrogen in the soil by, for example, litter fall. This deposition acts as a biological fertilization, which may be used by non-fixing plants. Alder is a nitrogen-fixing, pioneer tree species that loses its nitrogen-rich leaves late in the autumn. The aim of this study was to examine the effect on the total volume of production, when different proportions of nitrogen-fixing Alder were part of spruce stands.

The purpose of this report is to illustrate potentials and problems with withdrawal of quality timber of birch. The purpose is also to describe possible ways to increase available quantities of quality timber. Former research is reviewed as introduction. The study begins with a prognosis of future volumes of birch timber based on consequence analyze by Swedish Forestry Agency. To illustrate the importance of active maintenance, two stands are estimated and simulated in the Heureka module StandWise.

Stands where pre commercial thinning has been ignored or inadequate often tend to have high stem density and low average diameter when they reach heights of thinning. In such stands, it can often be expensive to do a conventional pulpwood harvest as a first thinning. This study investigates the development of the stands and the economic outcome of forest fuel extraction, or a combined harvest as alternatives to the ordinary pulpwood harvest. Simulations in Heureka StandWise were performed for two thin and dense stands, which were constructed by data from the Swedish National Forest Inventory. The simulations show that the extraction of forest fuel in first thinning at an early stage can provide higher net revenue compared to conventional pulpwood harvest at the same time or later.

Trakthyggesbruket är det idag dominerande skogsskötselsystemet i Sverige. Det finns nackdelar med att sköta skogen med trakthyggesbruk, av både sociala, estetiska och biologiska skäl. Det finns dock alternativa sätt att bruka skogen på, med hyggesfria skogsskötselsystem som bygger på att skogen är fullskiktad. Syftet med denna studie var att undersöka möjligheter i att omföra enskiktade skogar till fullskiktade genom återkommande gallringar med hjälp av simuleringar. Data som använts för simuleringarna är inventeringsdata från Västergötlands län, inventerat september 2013. Utifrån beståndsdata valdes bestånd ut med olika trädslagsblandning, ålder och bonitet. Simuleringsprogrammet som användes var Heureka StandWise och bestånden simulerades över en 100-årsperiod. Resultaten av simuleringarna visade att det var möjligt att skapa en fullskiktad skog, både i tallbestånd och granbestånd. Tät gallringsmogen skog på bördig mark visade sig vara svårt att konvertera.