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.
2006
Forfattere
Rein Drenkhan Märt HansoSammendrag
No abstract has been registered
Sammendrag
Hydrological time-series are known to depict long-term structures, and pronouncednonlinearities. Singular System Analysis (SSA) is one way to extract long-term componentsof these data-sets. Classical SSA is a principal component analysis (PCA) inthe time domain...
Forfattere
Vaidotas Lygis Rimvis Vasiliauskas Jan StenlidSammendrag
No abstract has been registered
Sammendrag
No abstract has been registered
Forfattere
Rimvis Vasiliauskas Audrius Menkis Roger D. Finlay Jan StenlidSammendrag
Fungi of roots of declining pine and spruce seedlings were assessed by pure culture isolations and direct sequencing. The isolation from 1440 roots of 480 seedlings (240 per each tree species) yielded 1110 isolates which, based on mycelial morphology and ITS rDNA sequences, were found to represent 87 distinct taxa.
Sammendrag
Resins and oils can easily evaporate during drying processes at high temperatures. The aim of this research was to investigate different drying methods such as oven-drying, vacuumdrying and freeze-drying of resin modified pine-sapwood samples to determine wood moisture content (MC) and weight percent gain (WPG). The results showed that freeze-drying is the slowest process. Vacuum drying of water impregnated samples takes approx. 7 times longer compared to oven-drying. The initial moisture content of wood before impregnation used in this research has only little influence on the WPG.
Forfattere
Arja Lilja Mirkka Kokkola Jarkko Hantula Päivi ParikkaSammendrag
At least 60–80 Phytophthora species has been described and most of them are soil-borne pathogens causing damping off, root rot, collar and stem rot and foliar blight on different woody plant species. These microbes are sometimes difficult to isolate and even more difficult to identify. A general review of isolation, detection and some newly identified species, including Phytophthora alni complex and P. ramorum, is presented in this article.
Forfattere
Jan Stenlid Magnus Karlsson Mårten Lind Karl Lundén Aleksandra Adomas Frederick Asiegbu Åke OlsonSammendrag
No abstract has been registered
Forfattere
Tiina Kuusela Johanna Witzell Annika NordinSammendrag
No abstract has been registered
Forfattere
L.H. Pardo P.H. Templer C.L. Goodale S. Duke P.M. Groffman M.B. Adams P. Boeckx J. Boggs J. Campbell B. Colman J. Compton Bridget A. Emmett Per Gundersen O. Janne Kjønaas G. Lovett M. Mack A. Magill M. Mbila M.J. Mitchell G. McGee S. McNulty Knute J. Nadelhoffer S. Ollinger D. Ross H. Rueth L. Rustad P. Schaberg S. Schiff Patrick Schleppi J. Spoelstra W. WesselSammendrag
N saturation induced by atmospheric N deposition can have serious consequences for forest health in many regions. In order to evaluate whether foliar d15N may be a robust, regional-scale measure of the onset of N saturation in forest ecosystems, we assembled a large dataset on atmospheric N deposition, foliar and root d15N and N concentration, soil C:N, mineralization and nitrification. The dataset included sites in northeastern North America, Colorado, Alaska, southern Chile and Europe. Local drivers of N cycling (net nitrification and mineralization, and forest floor and soil C:N) were more closely coupled with foliar d15N than the regional driver of N deposition. Foliar d15N increased non-linearly with nitrification:mineralization ratio and decreased with forest floor C:N. Foliar d15N was more strongly related to nitrification rates than was foliar N concentration, but concentration was more strongly correlated with N deposition. Root d15N was more tightly coupled to forest floor properties than was foliar d15N. We observed a pattern of decreasing foliar d15N values across the following species: American beech>yellow birch>sugar maple. Other factors that affected foliar d15N included species composition and climate. Relationships between foliar d15N and soil variables were stronger when analyzed on a species by species basis than when many species were lumped. European sites showed distinct patterns of lower foliar d15N, due to the importance of ammonium deposition in this region. Our results suggest that examining d15N values of foliage may improve understanding of how forests respond to the cascading effects of N deposition. Introduction Nitrogen saturation is the process by which chronically elevated N inputs alter forest ecosystems, ultimately resulting in increases in ecosystem N loss (Aber et al. 1989; 1998). N saturation can result in detrimental plant responses and have serious consequences for forest health (Nihlgard 1985; Aber et al. 1989; Schaberg et al. 2002) and may impact forests in many regions (Dise et al. 1998; Aber et al. 2003). Therefore, developing indicators useful for determining whether a forest is at N saturation and for predicting when a forest is nearing N saturation is valuable. Such indicators would facilitate both forest management and understanding of N cycling in forest ecosystems.