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.
2012
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Gage Koehler Robert Wilson John V. Goodpaster Anita Sønsteby Xianyin Lai Frank A. Witzmann Jin-Sam You Jens Rohloff Stephen K, Randall Muath Alsheikh-YousefAbstract
© 2012. This is the authors' accepted and refereed manuscript to the article. The final authenticated version is available online at: http://dx.doi.org/10.1104/pp.112.198267
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Arne Sæbø Robert Popek Barbara Nawrot Hans Martin Hanslin Helena Gawronska Stanislaw W GawronskiAbstract
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Logging exceeded growth and timber trees were sparse in Norwegian forests in the early 1900s. Still, the forest canopy was lush green and characterised by large tree-crowns. This situation was referred to as the “Green lie” and was advocated by foresters throughout Scandinavia as an argument in favour of forestry practices based on clear-felling. Here we examine effects of past selective loggings on forest structure and composition in a spruce forest landscape using dendroecology and historical records. Our results show that forests that were selectively logged up to the early 1900s could be structurally heterogeneous with multi-layered canopies, varying degree of openness and continuous presence of old trees across different spatial scales. Because the past forests were not clear-felled, a diverse forest structure in terms of tree species composition and age and diameter distribution was maintained over time, which could enable forest-dwelling species to persist during the early phase following the loggings in the past. This is in sharp contrast to the situation in most modern managed forest landscapes in Scandinavia. A better understanding of the link between loggings in the past- and present-day forest structure and diversity will contribute to rewarding discussions on forestry methods for the future.
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M Josuttis P Crespo Rolf Nestby T.B. Toldam-Andersen H Dietrich Erika KrügerAbstract
The effect of four different growing locations from Stjørdal, Norway (63,36N) to Conthey, Switzerland (46,12N) on the composition of bioactives in strawberry /Fragaria x ananassa Duch.) of three genotypes (cvs Clery, Elsanta and Korona) was evaluated. Principal component analysis (PCA) was used to characterize differences in bioactives between genotype within a location. Despite harvest period and year-to-year effects, a clear clustering related to the effects of the cultivars was shown. Furthermoe, PCA was able to separate locations within a cultivar due to differences in bioactive compounds and this effect was stronger than the local variations by temporary weather changes or even year-to-year effects. As a result, the northern samples had principally lower anthocyanin amounts than the southern ones and, moreover, distribution of individual anthocyanins was different. In contrast, the content of vitamin C and the antioxidant capacity (TEAC, ORAC, total phenols) was generally increased with higher latitudes calculated on fresh weight basis. Results of proanthocyanidins and individual polyphenols detected by high performance liquid chromatography indicated that the higher contents were mainly due to tannin-related components. For all these observations, cultivars responded in general similarly. A north-South division was identified but no clear trend towards latitud could be recorded, mainly since major impact factor for the biosynthesis of phenolics and ascorbic acid is temperate, which is altering not only by latitude, but also by the shift of the harvest period and the current weather conditions prior to harvest. In conclusion, genetic effects were generally stronger than environmental effects.