Björkbarksextrakt, BBE : en lönsam lösning på betningsproblematiken?

Abstract: The calculations in this thesis are evaluating the profit as a consequence from treating young stands of pine in Sweden with birch bark extract, BBE. Treatment is to be done with the object to lower or fully reduce the moose browsing on pine. The study is made in three versions. The results from each version separately will follow below. Version I.: The size of the moose population is in no way affected by the reduced resources of food as a consequence of large scale treatment with BBE on pine. Results show profit at a 3 percent level of interest with the exception of treatment program with more than 4 treatments all together and with the exception of Västerbottens Län with an early first treatment. Version II.: The population of moose decrease from 10 to 5 individuals per 1000 ha as a consequence from large scale treatment with BBE on young pine stands. Results show profit at a 3 percent level of interest with the exception of treatment program with more than 4 treatments all together and with the exception of Västerbottens Län with an early first treatment. Results also show that treatment BBE will increase the profit compared to profit from stands that has not been treated with BBE. This is valid for both version I. and II. Version III.: The effect of the substrate is let to vary from a reduction to 0 percent browsing to a non-reduction to 30 percent browsing. Results show profit at 3 percent interest when BBE only reduces the browsing from 30 to 15 percent. Compared to results presented above with a reduction to 0 percent. Furthermore, for interests above 3 percent, for all versions, results show as follows. Within some treatment programs the negative net value is somewhat decreased but still negative after treatment with BBE. For every other situation treatments when calculating with a 4 or 5 percent interest is neither profitable nor responsible for decreasing an already negative net value.