Per Gundersen,^* Ari Laurén,^** Leena Finér,^*** Eva Ring,^**** Harri Koivusalo,^***** Magne Sætersdal,^****** Jan-Olov Weslien,^******* Bjarni D. Sigurdsson,^******** Lars Högbom,^********* Jukka Laine,^********** Karin Hansen<sup>***********


*</sup>Per Gundersen () is professor in forest ecology at the Department of Forest and Landscape Ecology. His research focuses on the cycles of water, nitrogen and carbon in forest landscapes and on the major drivers of change in these cycles. Address: Department of Forest and Landscape Ecology, Forest and Landscape Denmark, University of Copenhagen, Hørsholm Kongevej 11, 2970 Hørsholm, Denmark. e-mail: pgu@life.ku.dk
^**Ari Laurén is scientist at Finnish Forest Research Institute and he develops computational tools for assessing impacts of forest management on water courses. Address: Joensuu Research Unit, Finnish Forest Research Institute, P.O. Box 68, 80101 Joensuu, Finland. e-mail: ari.lauren@metla.fi
^***Leena Finér is professor in silviculture at Finnish Forest Research Institute. Her research interests are environmental impacts of forestry and nutrient pools and fluxes in forests. Address: Joensuu Research Unit, Finnish Forest Research Institute, P.O. Box 68, 80101 Joensuu, Finland. e-mail: leena.finer@metla.fi
^****Eva Ring has a PhD in Soil Science and works at Skogforsk—The Forestry Research Institute of Sweden. Her research focuses on the environmental effects of forestry on water chemistry. Address: Skogforsk Uppsala Science Park, 751 83 Uppsala, Sweden. e-mail: eva.ring@skogforsk.se
^*****Harri Koivusalo is professor in water resources engineering at Department of Civil and Environmental Engineering, Aalto University School of Science and Technology. His special interest is in hydrology and he develops computational tools for assessing impacts of forest management on water courses. Address: P.O. Box 15200, 00076 Aalto, Finland. e-mail: harri.koivusalo@tkk.fi
^******Magne Sætersdal is a senior scientist in conservation biology at The Forest and Landscape Institute of Norway. His primary research interests focuses on reserve selection strategies, environmental effects of forestry, and spatial and temporal distribution of rare and threatened species. Address: Skog og Landskap, Fanaflaten 4, 5244 Fana, Norway. e-mail: magne.setersdal@skogoglandskap.no
^*******Jan-Olov Weslien works at Skogforsk The Forestry Research Institute of Sweden. He is at present heading the research programme “Environment” at Skogforsk and is consulting Professor in Conservation Biology at SLU. His research focuses on insect pest management and biodiversity issues in forestry. Address: Skogforsk Uppsala Science Park, 751 83 Uppsala, Sweden. e-mail: jan-olov.weslien@skogforsk.se
^********Bjarni D. Sigurdsson is a professor of forest science at the Agricultural University of Iceland. He has mainly been working with effects of afforestation on ecosystem function, including productivity, carbon, water and nutrient cycles. Address: Agricultural University of Iceland, Hvanneyri, 311 Borgarnes, Iceland, e-mail: bjarni@lbhi.is
^*********Lars Högbom is an Assoc. Professor in Soil Science and works at Skogforsk—The Forestry Research Institute of Sweden. His research focuses on the environmental effects of forestry, mainly with respect to nitrogen. Address: Skogforsk Uppsala Science Park, 751 83 Uppsala, Sweden. e-mail: lars.hogbom@skogforsk.se
^**********Jukka Laine is professor in peatland research in the Finnish Forest Research Institute. Address: Parkano Research Unit, Finnish Forest Research Institute, Kaironiementie 54, 39700 Parkano, Finland. e-mail: jukka.laine@metla.fi
^***********Karin Hansen is a senior scientist in forest ecology at the Department of Forest and Landscape Ecology. Her primary research focuses on nutrient cycling in forest ecosystems with special interest in afforestation issues. Address: Department of Forest and Landscape Ecology, Forest and Landscape Denmark, University of Copenhagen, Hørsholm Kongevej 11, 2970 Hørsholm, Denmark. e-mail: kiha@life.ku.dk