Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2012
Forfattere
Jarkko Koskela Franҫois Lefèvre Silvio Schüler Hojka Kraigher Ditte C. Olrik Jason Hubert Roman Longauer Michele Bozzano Leena Yrjänä Paraskevi Alizoti Peter Rotach Lorenzo Vietto Sándor Bordács Tor Myking Thröstur Eysteinsson Oudara Souvannavong Bruno Fady Bart De Cuyper Berthold Heinze Georg von Wühlisch Alexis Ducousso Bjerne DitlevsenSammendrag
This paper provides a review of theoretical and practical aspects related to genetic management of forest trees. The implementation of international commitments on forest genetic diversity has been slow and partly neglected. Conservation of forest genetic diversity is still riddled with problems, and complexities of national legal and administrative structures. Europe is an example of a complex region where the distribution ranges of tree species extend across large geographical areas with profound environmental differences, and include many countries. Conservation of forest genetic diversity in Europe has been hampered by a lack of common understanding on the management requirements for genetic conservation units of forest trees. The challenge resides in integrating scientific knowledge on conservation genetics into management of tree populations so that recommendations are feasible to implement across different countries. Here, we present pan-European minimum requirements for dynamic conservation units of forest genetic diversity. The units are natural or man-made tree populations which are managed for maintaining evolutionary processes and adaptive potential across generations. Each unit should have a designated status and a management plan, and one or more tree species recognized as target species for genetic conservation. The minimum sizes of the units are set at 500, 50 or 15 reproducing individuals depending on tree species and conservation objectives. Furthermore, silvicultural interventions should be allowed to enhance genetic processes, as needed, and field inventories carried out to monitor regeneration and the population size. These minimum requirements are now used by 36 countries to improve management of forest genetic diversity.
Forfattere
Franҫois Lefèvre Jarkko Koskela Jason Hubert Hojka Kraigher Roman Longauer Ditte C. Olrik Silvio Schüler Michele Bozzano Paraskevi Alizoti Remigijus Bakys Cathleen Baldwin Dalibor Ballian Sanna Black-Samuelsson Dagmar Bednarova Sándor Bordács Eric Collin Bart De Cuyper Sven M.G. De Vries Thröstur Eysteinsson Josef Frýdl Michaela Haverkamp Mladen Ivankovic Heino Konrad Czeslaw Koziol Tiit Maaten Eduardo Notivol Paino Hikmet Öztürk Ivanova Denitsa Pandeva Gheorghe Parnuta Andrej Pilipovic Dragos Postolache Cathal Ryan Arne Steffenrem Maria Carolina Varela Federico Vessella Roman T. Volosyanchuk Marjana Westergren Frank Wolter Leena Yrjänä Inga ZarinaSammendrag
Dynamic conservation of forest genetic resources (FGR) means maintaining the genetic diversity of trees within an evolutionary process and allowing generation turnover in the forest. We assessed the network of forests areas managed for the dynamic conservation of FGR (conservation units) across Europe (33 countries). On the basis of information available in the European Information System on FGR (EUFGIS Portal), species distribution maps, and environmental stratification of the continent, we developed ecogeographic indicators, a marginality index, and demographic indicators to assess and monitor forest conservation efforts. The pan-European network has 1967 conservation units, 2737 populations of target trees, and 86 species of target trees. We detected a poor coincidence between FGR conservation and other biodiversity conservation objectives within this network. We identified 2 complementary strategies: a species-oriented strategy in which national conservation networks are specifically designed for key target species and a site-oriented strategy in which multiple-target units include so-called secondary species conserved within a few sites. The network is highly unbalanced in terms of species representation, and 7 key target species are conserved in 60% of the conservation units. We performed specific gap analyses for 11 tree species, including assessment of ecogeographic, demographic, and genetic criteria. For each species, we identified gaps, particularly in the marginal parts of their distribution range, and found multiple redundant conservation units in other areas. The Mediterranean forests and to a lesser extent the boreal forests are underrepresented. Monitoring the conservation efficiency of each unit remains challenging; however, <2% of the conserved populations seem to be at risk of extinction. On the basis of our results, we recommend combining species-oriented and site-oriented strategies.
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Forfattere
Inger Sundheim FløistadSammendrag
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Forfattere
Tore SkrøppaSammendrag
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Tore SkrøppaSammendrag
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Tore SkrøppaSammendrag
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Tore SkrøppaSammendrag
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Tore SkrøppaSammendrag
Forests and wooded land cover 39 % of the land area of Norway and productive forest amounts to 8.3 million hectares. Two conifer species, Picea abies and Pinus sylvestris, dominate the forest area; they cover 71 % of the forest area and 84 % of total volume. The annual harvest is at present less than 50 % of the annual increment. Forestry and the wood industry have great financial importance in Norway, and timber and wood products have a gross value of 5 % of the total gross domestic product. Forestry is characterized by small-scale properties which to a large extent are privately owned. The main objective of the forest policy is to promote sustainable forest management with a view to promote active, local and economic development, and to secure biological diversity, considerations for the landscape, outdoor recreation and the cultural values associated with the forest. Forest management plans are important instruments to obtain these goals. Three targeted programmes have high priority in the present forest policy: forests and climate, increased use of wood and bioenergy. Active use of the forest genetic resources may contribute to the success of these programmes. Species composition and distribution of forest trees in Norway is largely determined by the following factors: the invasion of tree species after the Ice Age, subsequent climatic changes and human activities ....