Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2013
Abstract
Old trees represent key features of old-growth forests and are important elements for maintaining biodiversity. Due to extensive human exploitation of Fennoscandian boreal forests during several centuries, old Norway spruce trees have become exceedingly rare. We analysed 91 spruce trees in Trillemarka Nature Reserve, southern Norway, to investigate (1) the maximum age of living trees, (2) growth rates of different-age trees and (3) growth trends in very old trees. Increment cores were taken from trees in selected old-growth stands located at 700–850 m a.s.l. Twelve spruce trees had an estimated total age of >400 years, the oldest one being 529 years and presumably the oldest known still living Norway spruce in northern Europe. A negative relationship between growth rate (basal area increment) and total age was observed, being most distinct for growth rates at 126–275 years and less marked for early stage growth (26–75 years). Thus, high age apparently was related more to low growth rates at adult and old stages of life rather than at the earlier stage. Among the trees >400 years, many of them did not show growth decrease with advancing age, indicating that ageing did not reduce growth. We conclude that the maximum age of stand-forming Fennoscandian Norway spruce trees would be in the range of 500–600 years.
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Academic – Age effects in demand models: What about cohort and period effects?
Geir Wæhler Gustavsen
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Geir Wæhler GustavsenAbstract
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Ingebjørg Helena Nymo Morten Tryland Anne Kirstine Højholt Frie Tore Haug Geoffrey Foster Rolf Rødven Jacques GodfroidAbstract
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Academic – Agricultural management in the JOVA catchemnts
Marit Hauken, Sigrun Hjalmarsdottir Kværnø
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Matthew Mccartney Lisa-Maria Rebelo Stefanos Xenarios Vladimir SmakhtinAbstract
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Jihong Liu ClarkeAbstract
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