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Att välja trä
- 2020. - 10
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Editorial collection (pop. science, debate, etc.)
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| 2. |
- Persson, Magnus, et al.
(author)
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Precision thinning : a comparison of optimal stand-level and pixel-level thinning
- 2022
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In: Scandinavian Journal of Forest Research. - : Taylor & Francis Group. - 0282-7581 .- 1651-1891. ; 37:2, s. 99-108
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Journal article (peer-reviewed)abstract
- Precision forestry allows decision-making on tree level or pixel level, as compared to stand-level data. However, little is known about the importance of precision in thinning decisions and its long-term effects on within-stand variation, stand economy and growth. In this study, silviculture was optimized for Net Present Value (NPV) in 20 conifer-dominated forest stands in hemi-boreal southern Sweden. The precision-thinning approach, Precision Thinning (PT), is compared with a stand-level approach, Stand Level Thinning (SLT) that is optimized for the same criteria but based on stand-level data. The results suggest no substantial long-term benefit or drawback in implementing thinning decisions based on pixel-level data as compared to stand-level data when optimizing stand economy. The result variables NPV and Mean annual increment of living stem volume (MAI(net)) were not higher for PT than for SLT. The within-stand variation in basal area (m(2)/ha(-1)) was lower at the end of the rotation compared to the start of the simulation for both SLT and PT. At the end of the rotation, SLT had higher variation in basal area compared to PT. However, pixel-level information enables adapting the silviculture to the within-stand variation which may favour other forest management goals than strictly financial goals.
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| 3. |
- Ambrazaitis, Gilbert, et al.
(author)
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The prosody of contrastive topics in Southern Swedish
- 2012
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In: Proceedings FONETIK 2012 : The XXVth Swedish Phonetics Conference, May 30–June 1, 2012. - Gothenburg : Department of Philosophy, Linguistics and Theory of Science, University of Gothenburg. - 9789163709852 ; , s. 1-4
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Conference paper (other academic/artistic)abstract
- This paper presents a pilot study on the prosodic marking of a contrastive topic in Southern Swedish. A test sentence was elicited in three experimental conditions: initial focus; final focus; contrastive topic (initial word) plus focus (final word). F0 patterns were analysed in recordings of 10 speakers. A majority of the speakers distinguished clearly between the conditions, but speakers employed different strategies. The most common one involved modifying the range and/or level of the F0 patterns given by the lexical pitch accents. Another frequent strategy involved a rising pitch accent on the initial word, where the lexical pitch accent would normally stipulate a fall. This result was unexpected and indicates that Southern Swedish sentence intonation might be more complex than typically assumed.
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| 5. |
- Andersson, Håkan S., 1967-, et al.
(author)
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The toxicity of ribbon worms: alpha-nemertides or tetrodotoxin, or both?
- 2016
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In: Planta Medica. - : Georg Thieme Verlag KG. - 0032-0943 .- 1439-0221. ; 82:Supplement 1
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Journal article (other academic/artistic)abstract
- The marine ribbon worms (nemerteans) are predators which capture their prey by everting a proboscis carrying a mixture of toxins which brings on rapid paralysis [1]. Moreover, ribbon worms have a thick layer of epidermal mucus of similar constitution. Tetrodotoxin (TTX) has been identified as one of these toxins [2]. The extreme toxicity of TTX (lethal by ingestion of 0.5-2 mg) is due to its ability to block voltage-gated sodium channels. Although several bacterial species (among these Vibrio sp.) have been linked to its synthesis, the biogenic origin and biosynthesis is unclear. One hypothesis is that TTX production occurs in a symbiotic relationship with its host, in this case the ribbon worm [3]. We have made significant effort to identify TTX in a setup for production through the cultivation of Vibrio alginolyticus in nutrient broth infused with mucus from the ribbon worm Lineus longissimus. Toxicity was demonstrated by fraction injections into shore crabs, but no TTX was found, and it could be shown conclusively that toxicity was unrelated to TTX and the Vibrio culture itself, and rather a constituent of the ribbon worm mucus [4]. The following studies led us to the discovery of a new class of peptides, the alpha-nemertides, in the mucus of the ribbon worms, which could be directly linked to the toxic effects. A literature review of the available evidence for TTX in ribbon worms show that the evidence in most cases are indirect, although notable exceptions exist. This points to the necessity to further investigate the presence and roles of TTX and alpha-nemertides in ribbon worms.
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| 6. |
- Andersson, Staffan, 1969-, et al.
(author)
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Democracy and technocracy in Sweden's Experience of the COVID-19 Pandemic
- 2022
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In: Frontiers in Political Science. - : Frontiers Media S.A.. - 2673-3145. ; 4, s. 1-13
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Journal article (peer-reviewed)abstract
- Sweden’s management of the coronavirus pandemic, beginning in early 2020, hasbeen much discussed because it deviated from other countries’ equivalents. Set inthe context of scholarly debate about the balance between politicians and experts inpolitical decision-making, we argue that a necessary condition for this case of Swedishexceptionalism was the manner of policy-making adopted by the Swedish authorities. Inthis article, we describe this policy-making procedure, which involved a radical form ofdelegation by elected politicians to appointed experts, and seek to explain how it cameabout. We focus on the 1st year of the pandemic, and use media reports and other publicdocuments, including parts of a public inquiry, as our empirical material.
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| 7. |
- Eriksson, Erik, et al.
(author)
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Integrated carbon analysis of forest management practices and wood substitution
- 2007
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In: Canadian Journal of Forest Research. - 0045-5067 .- 1208-6037. ; 37:3, s. 671-681
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Journal article (peer-reviewed)abstract
- The complex fluxes between standing and harvested carbon stocks, and the linkage between harvested biomassand fossil fuel substitution, call for a holistic, system-wide analysis in a life-cycle perspective to evaluate the impacts offorest management and forest product use on carbon balances. We have analysed the net carbon emission under alternativeforest management strategies and product uses, considering the carbon fluxes and stocks associated with tree biomass,soils, and forest products. Simulations were made using three Norway spruce (Picea abies (L.) Karst.) forest managementregimes (traditional, intensive management, and intensive fertilization), three slash management practices (no removal, removal,and removal with stumps), two forest product uses (construction material and biofuel), and two reference fossilfuels (coal and natural gas). The greatest reduction of net carbon emission occurred when the forest was fertilized, slashand stumps were harvested, wood was used as construction material, and the reference fossil fuel was coal. The lowest reductionoccurred with a traditional forest management, forest residues retained on site, and harvested biomass was used asbiofuel to replace natural gas. Product use had the greatest impact on net carbon emission, whereas forest management regime,reference fossil fuel, and forest residue usage as biofuel were less significant.
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| 8. |
- Eriksson, Johan, 1970-, et al.
(author)
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Blickar och betydelser : Digitala rekonstruktioner av tavelhängningarna på Stockholms slott 1795–1866
- 2019
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In: 1700-tal: Nordic Journal for Eighteenth-Century Studies. - : UiT The Arctic University of Norway. - 1652-4772 .- 2001-9866. ; 16, s. 79-103
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Journal article (peer-reviewed)abstract
- During the years 1795–1866 the Swedish national art collection, today’s Nationalmuseum, was on display at the Royal Palace in Stockholm at what was known as Kongl. Museum. This museum consisted of two sculpture galleries adjacent to the palace garden Logården and a paintings gallery and a few more rooms on the second floor. While the sculpture galleries are well known as well as reconstructed in situ, there has been much less research on the display of paintings at the museum. In the cross disciplinary research project »Virtual Museum at the Royal Palace» we are using a digital 3D model to reconstruct the display of paintings in the so-called smaller gallery of the palace, as it was displayed during the period. The reconstruction deals with two different hangings of the gallery, in 1795 and c. 1843, made by the curators Carl Fredric Fredenheim and Lars Jacob von Röök respectively. Our preliminary findings show that, contrary to earlier claims, the two hangings are rather different and constructed on quite different ideologies of museum display, something that is possible to see thanks to the method of using digital 3D-models as a basis for analysis.
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| 9. |
- Eriksson, Ljusk Ola, et al.
(author)
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A Tool for Long-Term Forest Stand Projections of Swedish Forests
- 2022
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In: Forests. - : MDPI. - 1999-4907. ; 13:6
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Journal article (peer-reviewed)abstract
- The analysis of forest management strategies at landscape and regional levels forms a vital part of finding viable directions that will satisfy the many services expected of forests. This article describes the structure and content of a stand simulator, GAYA, which has been adapted to Swedish conditions. The main advantage of the GAYA implementation compared to other resources is that it generates a large number of management programmes within a limited time frame. This is valuable in cases where the management programmes appear as activities in linear programming (LP) problems. Two methods that are engaged in the projections, a climate change response function and a soil carbon model, are designed to complement other methods, offering transparency and computational effectiveness. GAYA is benchmarked against projections from the Heureka system for a large set of National Forest Inventory (NFI) plots. The long-term increment for the entire NFI set is smaller for GAYA compared with Heureka, which can be attributed to different approaches for modelling the establishment of new forests. The carbon pool belonging to living trees shows the same trend when correlated to standing volume. The soil carbon pool of GAYA increases with increased standing volume, while Heureka maintains the same amount over the 100-year projection period.
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| 10. |
- Eriksson, Ljusk Ola, et al.
(author)
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Impacts of Long-term Strategies for the Swedish Forest Sector : Analyses with the BioFrame Integrated Modelling Framework
- 2024
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In: Journal of Forest Economics. - : Now Publishers Inc.. - 1104-6899 .- 1618-1530. ; 39:2, s. 137-185
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Journal article (peer-reviewed)abstract
- The European Union (EU) does not have a common forestry policy but EU policies can indirectly affect the forest sector. This study departs from the EU "Fit for 55" package of legislation and uses a forest sector model to simulate and analyze three responses in the Swedish forest sector (2020-2100) to policy initiatives addressing climate change and biodiversity: (i) increasing the area of set-asides with 50%; (ii) prohibiting harvest of old forest (>120/140 years of age); and (iii) extending the minimum allowed age for final harvest with 30%. Results indicate that, while all three responses can reduce net carbon emissions compared to business-as-usual, extension of the minimum allowed age for final harvest reduces emissions the most. In general, the effects on net carbon emissions are highly correlated with the level of harvest. Increasing the area of set-asides and prohibiting old forest harvest help preserve old forest better than both business-as-usual and final felling age regulation. Longer-term results are uncertain as policies and technology development can radically change biomass use, product portfolios and displacement effects.
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