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.
2025
Abstract
For establishment and growth of newly planted seedlings it is essential to overcome environmental stress at the planting site. Adding the amino acid arginine at planting is a novel treatment aiming at increased establishment success, so far tested in a limited number of applied studies. We examined the effects of adding arginine-phosphate (arGrow®), mechanical site preparation (MSP), and planting time on survival and growth of Norway spruce and Scots pine seedlings in two field experiments in boreal southeastern Norway. After three growing seasons, survival for spring planted seedlings of both species was significantly better following MSP, while addition of arginine-phosphate did not have any effect. Autumn planted pine seedlings with MSP and arginine had higher survival and also larger diameter than spring planted ones with MSP but without arginine. Spruce and pine seedlings with MSP were taller and had larger diameter than those without MSP. For spring planted seedlings of both species, dry weight of roots and shoots was positively affected by MSP, but not by arginine. To conclude, arginine-phosphate had neutral to modestly positive effects on survival and growth, while MSP had clear positive effects. The effect of planting time varied with species.
Authors
Zahra Bitarafan Wiktoria Kaczmarek-Derda Therese With Berge Inger Sundheim Fløistad Christian AndreasenAbstract
No abstract has been registered
Authors
Katri Kärkkäinen Sonja T. Kujala Rosario Garcia-Gil Arne Steffenrem Johan Sonesson Liina Hoikkala Harri Mäkinen Sauli ValkonenAbstract
• Genetic effects of continuous cover forestry (CCF) are not well known. We need more research, especially on the genetics of spruce-dominated CCF sites. Levels of relatedness are of interest, as are estimates of safe limits for the intensity and duration of CCF practices that secure genetic potential for good growth and quality. • With even-aged forestry, genetically improved regeneration material can be used to mitigate climate change-related risks through breeding and deployment recommendations. In CCF, currently based on natural regeneration, we assume that enough seedlings establish, and that sites contain enough genetic variation to enable natural selection and evolutionary processes. • Based on research in other regions, the number of reproducing trees must be kept large to avoid excessive levels of relatedness and inbreeding and to maintain sufficient levels of genetic diversity. • In some well-documented long-term experiments in other regions, intensive high-grading has led to slower growth rates, which could partly be due to genetic degradation of the stand. If contemporary recommendations for selection cutting are followed, negative genetic effects should be unlikely.
Authors
G. Brundu S. Follak J. Pergl D. Chapman E. Branquart S. Buholzer Inger Sundheim Fløistad G. Fried M. Herbst E. Marchante Valkenburg van Valkenburg R. TannerAbstract
Bamboos are popular ornamental plants in the EPPO region though some of themhave been observed to escape the confines of planting and establish in the naturalenvironment. The aim of this study is to produce a risk-based list of bamboospecies which are recorded in the natural environment in the EPPO region, and todetermine if any of the species require a pest risk analysis. Forty-two bamboo specieswere identified as being present in the natural environment in the EPPO region. Ofthese, 11 species fulfil the three pre-selected criteria for species to be consideredpotentially harmful: (1) the species is naturalized in at least one EPPO country; (2)the species has a running dispersal behaviour (leptomorph); and (3) there is evidenceof invasive behaviour in at least one country. These 11 species were prioritized usingthe EPPO prioritization process for invasive alien plants. Owing to their high spreadpotential and potential high impact, three species, namely Phyllostachys aurea,Pseudosasa japonica and Sasa palmata, proceeded to the second stage of theprioritization process (risk management stage). All three species were identified ashaving a high priority for a pest risk analysis. In 2024, the EPPO Panel on InvasiveAlien Plants agreed with the results of the study but noted that further informationon impacts would be beneficial and therefore the Panel agreed that Ph. aurea andS. palmata should be added to the EPPO Alert List along with the already includedP. japonica. This will raise awareness of these species in the region and furtherinformation can be gathered to support the development of a risk assessment
Authors
David Chludil Jaroslav Čepl Arne Steffenrem Jan Stejskal Christi Sagariya Torsten Pook Silvio Schueler Jiří Korecký Curt Almqvist Debojyoti Chakraborty Mats Berlin Milan LstibůrekAbstract
No abstract has been registered
Authors
Tore SkrøppaAbstract
No abstract has been registered
Authors
Tore SkrøppaAbstract
No abstract has been registered
Abstract
This study presents information about the variability between and within populations of Norway spruce in lammas shoot formation. Assessments of lammas shoots were conducted in two short-term trials involving full sib families of Norway spruce from two complete diallel crosses, each originating from a natural population. These assessments were made over two growing seasons when the trees were six and seven years from seed, during which early summer temperatures varied significantly. The trees were grown on former agricultural land with large variation in soil fertility across the field. The proportion of trees with lammas shoots varied among blocks, ranging from 1 to 14 %, with the highest values in the blocks with the most fertile soil conditions. A substantial variation was also found among families from each population regarding the percentage of trees with lammas shoots, varying among half-sib families from 2 to 20 % and 1 to 19 % in the two populations, respectively. The largest part of this genetic variation was additive, with high values for the general combining ability (GCA) variance components and low values of the specific combining ability (SCA), maternal and reciprocal components. Estimates of narrow sense heritability were 0.40 for transformed lammas shoot scores in both diallels. Generally, families with an early start and early cessation of shoot elongation had the highest frequency of lammas shoots. In one of the diallels, families with a high lammas shoot percentage also had the highest number of ramicorn branches in a field trial at age 12 and 26 years from seed.
Abstract
This study presents information about the variability between and within populations of Norway spruce in lammas shoot formation. Assessments of lammas shoots were conducted in two short-term trials involving full sib families of Norway spruce from two complete diallel crosses, each originating from a natural population. These assessments were made over two growing seasons when the trees were six and seven years from seed, during which early summer temperatures varied significantly. The trees were grown on former agricultural land with large variation in soil fertility across the field. The proportion of trees with lammas shoots varied among blocks, ranging from 1 to 14 %, with the highest values in the blocks with the most fertile soil conditions. A substantial variation was also found among families from each population regarding the percentage of trees with lammas shoots, varying among half-sib families from 2 to 20 % and 1 to 19 % in the two populations, respectively. The largest part of this genetic variation was additive, with high values for the general combining ability (GCA) variance components and low values of the specific combining ability (SCA), maternal and reciprocal components. Estimates of narrow sense heritability were 0.40 for transformed lammas shoot scores in both diallels. Generally, families with an early start and early cessation of shoot elongation had the highest frequency of lammas shoots. In one of the diallels, families with a high lammas shoot percentage also had the highest number of ramicorn branches in a field trial at age 12 and 26 years from seed
2024
Abstract
No abstract has been registered