Lönsamhetskalkyl för produktion av gran på markavvattnad och askgödslad myrmark

Abstract: In Sweden there are about 4 million hectares of bare peat (mire). This land has great potential to be transformed into productive forest land, provided drainage is carried out and, in some cases, even fertilization with ashes. Drainage of mires is necessary because the high groundwater table prevents trees from growing due to reduced oxygen availability. Some of the key nutrients that trees need to grow appear in too small quantities in mires, especially potassium (K) and phosphorus (P). Ash from the combustion of biomass contains these elements and is therefore suitable as a fertilizer. Initiations of such projects usually entail high investment-costs and careful planning. This report presents land value calculation for mires when these are: 1. only drained or 2. drained and fertilized with ash. This was done by first dividing Sweden into four country regions in which the conversion of mires with varying site type to productive spruce forests were simulated. The calculations were based on data on temperature sums, drainage fertility potential, growth models, timber prices and other related expenses. The forecasting of forest growth and yield range was based on functions from the growth model Beståndsmetoden which was calculated in Microsoft Excel. Each site type in each country region constituted 1 ha and a land value was calculated for all stands. Thereafter a comparison was made of the profitability of the various stands within and between country regions. The results show that profitability decreases with increasing latitude and with lower SI. By adding ash fertilization to already drained mire, land value is always raised. Interest rate is by far the biggest factor that affects whether or not it is profitable to engage in forestry with the above management practices.