Vinster med björkinblandning i granbestånd i syfte att höja markens pH-värde

Abstract: The soil acidification and the pH-value of the soil have been discussed for many years. Many observations of the tree species effects on the soil pH have been done. We have discussed the effects on the soil surface pH-value with a birch (Betula spp. L.) admixture in Norway spruce stands (Picea abies L.).We have used data from the Swedish National Forest Inventory. We have also discussed how the wood production and the biodiversity can be increased in mixed stands, in according to the Swedish forestry act Skogsvårdslagen. Our sampling areas are located in Norrland, Sweden. The results show a significant correlation between an increased birch admixture and an increased pH-value of the soil. Our literature studies suggest an increased biodiversity. An alternative forest management with a birch shield gives a higher production and economic yield. We think that this can be a good alternative for the private forest owner who wants to increase the pH-value of the soil and the biodiversity, and maintain a rational forest management and a high economic yield.