Interactions among forest restoration measures and the spruce bark beetle infestations in southeastern Finland

EnnallistettuDuring the recent years, the spruce bark beetle (Ips typographus L.) has turned into a serious pest both in managed and conserved forest stands also in Finland. In 2008, Metsähallitus (the Finnish Forest and Park Service) implemented restoration measures in the Savioja nature preserve, a part of the Natura 2000 network (directive 92/43/EEC), located in Iitti, southeastern Finland. Within the site, mature Norway spruces (Picea abies H. Karst.) were killed to ensure a critical habitat of endangered European wild ginger (Asarum europaeum L.). Few years after restoration operations, the infestations by I. typographus were observed in the surrounding areas of the Savioja restoration site. The main goal of the project is to map and model spatial distribution, migration pattern and rate, and severity of the I. typographus infestation spots in the vicinity of the Savioja restoration site. The methods include spatial modeling, combining remote sensing, geographical information systems (GIS), and field inventory.  A goal is also to investigate the relationship between tree- and stand-wise characteristics and risk of an infestation and damage intensity.  The project will increase knowledge on forest disturbance by the bark beetle after human intervention and add value to forest health management and risk monitoring systems.