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.
2024
Sammendrag
Uneven-aged forests set certain challenges for cut-to-length harvesting work. It is a challenge to cost-effectively remove larger trees while leaving a healthy understory for regrowth. The study’s aim was to evaluate productivity and costs of harvesting two-storied silver birch (Betula pendula Roth) and Norway spruce (Picea abies (L.) H. Karst.) stands by creating time consumption models for cutting, and using existing models for forwarding. Damage to the remaining understory spruce was also examined. Four different harvesting methods were used: 1) all dominant birches were cut; 2) half of them thinned and understory was preserved; compared to 3) normal thinning of birch stand without understory; and 4) clear cutting of two-storied stand. Results showed the time needed for birch cutting as 26–30% lower when the understory was not preserved. Pulpwood harvesting of small sized spruces that prevent birch cutting was expensive, especially because of forwarding of small amounts with low timber density on the strip roads. Generally, when taking the cutting and forwarding into account, the unit cost at clear cuttings was lowest, due to lesser limitations on work. It was noted that with increasing removal from 100 to 300 m3 ha–1, the relative share of initial undamaged spruces after the harvest decreased from 65 to 50% when the aim was to preserve them. During summertime harvesting, the amount of stem damage was bigger than during winter. In conclusion, two-storied stands are possible to transit to spruce stands by accepting some losses in harvesting productivity and damages on remaining trees.
Forfattere
Kim Viggo Paulsen Weiby Sophie Julie Krizsan Ingjerd Dønnem Liv Østrem Margrete Eknæs Håvard SteinshamnSammendrag
No abstract has been registered
Sammendrag
No abstract has been registered
Sammendrag
This study investigated the variation in health- and sensory-related phytochemicals and agronomic characteristics of 26 head cabbage cultivars grown in randomized block field trials under commercial cultivation conditions in three different harvest seasons. The main goal was to provide increased knowledge on the nutritional quality of current and potential new cabbage cultivars to allow for a substantiated choice of cultivars for growers, industry, and consumers. Providing a wide diversity, all cultivars performed well with regard to agronomic characteristics that determine market quality and revenue. Sugar content, an important parameter for consumer acceptance, was surprisingly similar in all cultivars, although higher and more variable in the winter cultivars. Red cabbages were among the highest in vitamin C, total phenolics, and glucosinolate content, especially in the coveted glucoraphanin, the precursor to sulforaphane. Savoy cabbage was highest in glucosinolate content and high in vitamin C but more like white cabbages in all other phytochemical parameters. Among the 20 white cultivars across all three seasons, there were small but significant differences in phytochemical content. Thus, the potential for product differentiation among this selection of cabbages was high.
Forfattere
Sylwia Wierzcholska Patryk Czortek Amy Elizabeth Eycott Fride Høistad Schei John-Arvid Grytnes Bogdan JaroszewiczSammendrag
No abstract has been registered
Sammendrag
No abstract has been registered
Forfattere
Qiang Liu Haoyu Zhang Haozhen Wang Shenggeng Zhao Yeqing Li Lu Feng Junting Pan Hongjun Zhou Chunming XuSammendrag
Anaerobic digestion (AD), as a crucial technology for organic waste resource recovery, faces the challenge of low efficiency in converting high-load organic substance into biogas. In this study, high-load AD system with food waste and excess sludge as co-substrates was constructed. The effect and mechanism of carbon quantum dots (CQD) derived from straw in promoting the performance of AD systems have been studied. The oxidation pretreatment of straw with H2O2 and acetic acid increased the yield of hydrothermal synthesis CQD to approximately 40%. The effect of different CQD on CH4 yield performance was further explored. The cumulative CH4 yield performance of the fermenter was improved after adding CQD. The CQD synthesized from pretreated straw and the nitrogen-doped CQD synthesized using Chlorella as the nitrogen source showed competitive promotion performance, increasing cumulative CH4 yield by 17.71% and 8.87%, respectively. These CQD can effectively accelerate the degradation of dissolved organic matter and thus improve the CH4 yield performance, with the most significant effect of CQD synthesized from pretreated straw. Electrochemical analysis and the correlation analysis between microorganisms and performance parameters showed that these CQD established an electron conductive network to enhance the electron transfer of the system. This well conductive conditions enriched hydrogenotrophic methanogenic (Methanosarcina), electroactive bacteria (Clostridium_sensu_stricto_1), and hydrolytic-acidifying bacteria (norank_f__Bacteroidetes_vadinHA17). This study significantly enhanced the yield of straw-derived CQD through green methods, and deeply revealed the potential promoting mechanisms of biomass-derived CQD by investigating the correlation between system performance and microorganisms in high-load AD systems.
Forfattere
Simeon Rossmann Erik Lysøe Monica Skogen Håvard Eikemo Marta Janiszewska Mirella Ludwiczewska Sylwester Sobkowiak Jadwiga Śliwka May Bente BrurbergSammendrag
No abstract has been registered
Sammendrag
No abstract has been registered
Forfattere
Ulrike BayrSammendrag
No abstract has been registered