| 1. |
- Högberg, Karl-Anders, et al.
(författare)
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Critical factors affecting ex vitro performance of somatic embryo plants of Picea abies
- 2001
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Ingår i: Scandinavian Journal of Forest Research. - : Informa UK Limited. - 0282-7581 .- 1651-1891. ; 16:4, s. 295-304
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The potential to use somatic embryos for large-scale propagation of elite genotypes, for integration into breeding programmes and for connecting breeding and mass propagation, is receiving much attention. However, before the methods are applied it is important that the plants regenerated via somatic embryogenesis grow as expected, i.e. as seedlings or cuttings. Growth of somatic embryo plants is under a cumulative influence of a number of treatments given during the in vitro phase and during the ex vitro establishment phase. The aim of this study was to identify treatments with a negative influence on the subsequent growth of somatic embryo plants of Norway spruce (Picea abies L. Karst.). Based on the results, the time of contact with abscisic acid during somatic embryo maturation and the length of continuous light treatment (CLT) during the first growth period strongly affect the height growth during two successive growth periods. In both cases longer treatments exerted negative effects. Based on these results a new method was set up, which includes: (1) prematuration treatment of the suspension culture in a growth regulator-free medium, by which the maturation step is synchronized and contracted; and (2) a two-phase germination treatment, first on a solidified medium and then in a liquid medium. This treatment avoids extended CLT during the first growth period. Another advantage of the two-phase germination treatment is a better root-system development. Somatic embryo plants produced according to this method can be transferred directly from in vitro conditions to the greenhouse.
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| 2. |
- Abrahamsson, Sara, et al.
(författare)
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Inheritance of height growth and autumn cold hardiness based on two generations of full-sib and half-sib families of Pinus sylvestris
- 2012
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Ingår i: Scandinavian Journal of Forest Research. - : Informa UK Limited. - 0282-7581 .- 1651-1891. ; 27, s. 405-413
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Tidskriftsartikel (refereegranskat)abstract
- The genetic variability in height growth and autumn cold hardiness were evaluated in a full-sib family of Scots pine (Pinus sylvestris (L.)) in a field trial in northern Sweden and 358 open pollinated families generated from the progeny of the full-sib cross. Height and autumn cold hardiness were assessed in the progeny of the full-sib cross at 9-19 years of age and on 3995 open pollinated progenies at three years of age. The autumn cold hardiness [critical temperature (CT)] of trees and progenies was tested by artificial freeze testing of detached needles at various temperatures. Significant genetic variation was found among progenies in both height growth and cold hardiness with a narrow sense heritability of 0.16 and 0.37, respectively. There was also a significant positive genetic correlation (r(a) = 0.39) between height growth and CT with taller trees showing later autumn cold acclimation. It was concluded that there is significant additive genetic variance for height and CT which warrants a potential for mapping quantitative trait loci. Furthermore, the low heritability for height growth shows the importance of removing the environmental influence by using additive genetic predictions instead of phenotypic measurements thereby improving the accuracy of genetic associations.
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| 3. |
- Alarcon Ferrari, Cristian, et al.
(författare)
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Forest research from a critical perspective - How can it contribute to new knowledge?
- 2012
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Ingår i: Scandinavian Journal of Forest Research. - : Informa UK Limited. - 0282-7581 .- 1651-1891. ; 27, s. 108-119
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Tidskriftsartikel (refereegranskat)abstract
- This paper develops insights from critical social theory with the aim of laying some foundations for critical forest research (CFR). The authors argue that such an approach could create needed knowledge about contemporary forest issues. In doing so, the paper first delves into the distinction between forest policy and politics of forests which is identified as a conceptually relevant issue within the context of CFR. Second, it uses the outcomes of the workshop Forest research from a critical perspective - How can it contribute to new knowledge? that was convened by the authors at the first Nordic Conference on Forest Policy Science held in Uppsala October 2010 to build on the conceptualisation of politics and policy within forest research. The combined findings of both a literature review on the issue of politics of forest and forest policy and the aforementioned workshop show that the conceptual difference between policy and politics is a key theoretical issue in relation to future prospects for CFR. In addition the results of the workshop clearly identified the epistemological, normative, social change dimensions and awareness of structural barriers as being at the core of attempts to develop theoretically grounded CFR. It is argued that a clarification of the concept "critique" is important within this context.
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| 4. |
- Andersson, Elias, et al.
(författare)
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In the eye of the storm : adaptation logics of forest owners in management and planning in Swedish areas
- 2018
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Ingår i: Scandinavian Journal of Forest Research. - : Taylor & Francis. - 0282-7581 .- 1651-1891. ; 33:8, s. 800-808
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Tidskriftsartikel (refereegranskat)abstract
- With a changing climate, storm and wind throw is becoming an increasing risk to forest. However, Swedish forest management practices have so far involved relatively little consideration of adaptation to climate change. This study examined resistance and alternatives to business as usual forest management, drawing upon material obtained in interviews with individual forest owners who spontaneously identified and discussed storm and wind throw as a risk to their forest. They thereby expressed a logic differing from that of the forest industry in Sweden, which has largely normalised storm risk rather than considering it in climate change adaptation work. The present analysis illustrates the broad and largely concerned position of individual forest owners, in contrast with a more established industry position on storm as an accepted and existing risk. Overall, the study highlights the diversity, agency and power relations within Swedish forestry and the forested landscape - aspects that are vital to better understanding processes relevant to forest and climate change adaptation.
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| 5. |
- Andersson, Elias, et al.
(författare)
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Service logics and strategies of Swedish forestry in the structural shifts of forest ownership : challenging the "old" and shaping the "new"
- 2019
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Ingår i: Scandinavian Journal of Forest Research. - : Taylor & Francis. - 0282-7581 .- 1651-1891. ; 34:6, s. 508-520
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Tidskriftsartikel (refereegranskat)abstract
- Sweden is one of the most forested countries in Europe, and it has one of the highest shares of productive forest. Production in forestry is largely reliant on the private non-industrial forest owners, who own half of the forest land. As in many countries, however, forest ownership is changing towards a higher extent of urban, female or non-forestry-background owners. This poses a challenge for the forestry services sector, mainly forest owners' associations and companies, but also broadly the sector at large. By exploring the sales and marketing processes, this paper analyses the service logics and strategies of Swedish forestry under changing forest ownership, drawing on an interview study covering all the large actors in the Swedish forestry sector. The study illustrates an increased focus of forestry organizations on services from a strategic and managerial perspective, in customer-oriented relationship development and in value creation and sales processes, specifically in order to manage "new" forest owners and the demand of forest industries. The results highlight the domination of service logics associated with timber production and the challenges for the service market and the provision of diversified services to forest owners.
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| 6. |
- Andersson, Jon, et al.
(författare)
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Short-term response to stump harvesting by the ground flora in boreal clearcuts
- 2017
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Ingår i: Scandinavian Journal of Forest Research. - : Informa UK Limited. - 0282-7581 .- 1651-1891. ; 32:3, s. 239-245
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Tidskriftsartikel (refereegranskat)abstract
- We studied short-term ground vegetation responses to stump harvesting by recording the occurrence of all species of bryophytes, vascular plants and the cover of soil disturbance on 20 clearcuts in the Southern and Middle Boreal zone in northern Scandinavia. All 20 clearcuts were slash-harvested and scarified and 10 of the clearcuts were also stump-harvested. The added effect of stump harvesting was assessed by comparing stump-harvested clearcuts with non-stump-harvested clearcuts. We tested whether stump harvesting causes extra soil disturbance compared to conventional forestry and if stump harvesting is affecting the assemblage, species richness and occurrence of individual species of vascular plants and bryophytes in boreal clearcuts. Our results revealed that stump harvesting causes an increase in the area of disturbed soil surface compared to conventional harvesting. Four of the most commonly occurring plant species in this area were significantly affected by stump harvesting, and Vaccinium vitis-idaea had a median occurrence of only 20% of that in non-stump-harvested clearcuts. The large impact on some plant species from a relatively modest increase of soil disturbance caused by stump harvesting suggest that stumps, with their slightly elevated bases, contributes to the survival of certain species on clearcuts.
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| 7. |
- Andersson, Jon, et al.
(författare)
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Tree cavity densities and characteristics in managed and unmanaged Swedish boreal forest
- 2018
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Ingår i: Scandinavian Journal of Forest Research. - : Informa UK Limited. - 0282-7581 .- 1651-1891. ; 33, s. 233-244
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Tidskriftsartikel (refereegranskat)abstract
- In forests worldwide, similar to 10-40% of bird and mammal species require cavities for nesting or roosting. Although knowledge of tree cavity availability and dynamics has increased during past decades, there is a striking lack of studies from boreal Europe. We studied the density and characteristics of cavities and cavity-bearing trees in three categories of forest in a north-Swedish landscape: clearcuts with tree retention, managed old (>100 years) forest, and unmanaged old forest. Unmanaged old forests had significantly higher mean density of cavities (2.4 +/- 2.2(SD) ha(-1)) than managed old forest (1.1 +/- 2.1 ha(-1)). On clearcuts the mean cavity density was 0.4 +/- 2.3 ha(-1). Eurasian aspen (Populus tremula) had a higher probability of containing excavated cavities than other tree species. There was a greater variety of entrance hole shapes and a higher proportion of cavities with larger entrances in old forest than on clearcuts. Although studies of breeding success will be necessary to more accurately assess the impact of forest management on cavity-nesting birds, our results show reduced cavity densities in managed forest. To ensure future provision of cavities, managers should retain existing cavity-bearing trees as well as trees suitable for cavity formation, particularly aspen and dead trees.
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| 8. |
- Andersson, Kjell, et al.
(författare)
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Green infrastructures and intensive forestry: Need and opportunity for spatial planning in a Swedish rural-urban gradient
- 2013
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Ingår i: Scandinavian Journal of Forest Research. - : Informa UK Limited. - 0282-7581 .- 1651-1891. ; 28, s. 143-165
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Tidskriftsartikel (refereegranskat)abstract
- There is a current industrial and societal interest in Europe to further intensify the yield of wood for the forest industry and biomass. At the same time, green infrastructures for ecological and sociocultural values in forest landscapes should be functional. Municipalities have exclusive responsibility for comprehensive planning in Sweden. We modelled the spatial distribution of green infrastructures in terms of three forest types with high ecological values, and three sociotopes with high sociocultural values in 119 municipalities in a ruralurban gradient in Sweden. Forest land without such values should be available for intensive forestry with lower conflict risk. We also estimated the municipalities' potential for physical planning in terms of financial and social capital, and ownership category structure. The area of functional green infrastructures varied considerably among municipalities. Municipalities with a high proportion of functional green infrastructure, thus less available for intensive forestry, were characterised by a stronger tax base, higher population density and lower demographic dependency ratio, and lower proportions of industrial and state forest ownership. We discuss the need for and opportunities of introducing collaborative physical planning to accommodate multiple demands on forest landscapes. We conclude that to accommodate both functional green infrastructures and intensive forestry, a landscape approach including knowledge-based collaboration is needed at multiple-levels of governance and management.
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| 9. |
- Andersson, Mats, et al.
(författare)
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Non-industrial private forest owners' financial risk taking : Does gender matter?
- 2010
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Ingår i: Scandinavian Journal of Forest Research. - : Informa UK Limited. - 0282-7581 .- 1651-1891. ; 25, s. 6-13
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Tidskriftsartikel (refereegranskat)abstract
- Male and female non-industrial private forest (NIPF) owners differ in inheritance positions, valuations and forest management style. A survey of Swedish NIPF owners found that male and female owners differ in their willingness to take a financial risk. The preliminary analysis, looking only at gender, revealed no difference in the willingness to take risk. Dividing the population according to dependence on income from forestry, however, showed that female NIPF owners increased their willingness to take financial risk when the dependence of income from forestry changed from insubstantial to notable. Females' tolerance towards risk was also significantly higher than males' at the notable level of dependence of forestry income. Having or not having economic yield as one of the most important objectives of ownership seemed to have a little effect on the willingness to take financial risk; however, the results were further strengthened when adding this dimension. A gender perspective was applied to explain identified differences between male and female forest owners concerning their willingness to take financial risks. Whether these differences emanate from real differences in willingness to take risk, or whether they are effects from other differences in male and female forest ownership, is discussed.
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| 10. |
- Andersson, Solbritt, et al.
(författare)
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Effects of lime (CaCO3) on ectomycorrhizal colonization of Picea abies (L.) Karst. - seedlings planted in a spruce forest
- 1995
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Ingår i: Scandinavian Journal of Forest Research. - : Informa UK Limited. - 0282-7581 .- 1651-1891. ; 10:2, s. 149-154
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Tidskriftsartikel (refereegranskat)abstract
- In two consecutive years, seedlings of Norway spruce (Picea abies) were planted in a 50-yr-old Norway spruce forest in limed (3.8 tons CaCO3 ha-1) and control plots. After 6 months they were harvested and the mycorrhizal status of the roots was analysed. Six types of mycorrhiza were distinguished. Three decreased after liming, two increased and one was not affected consistently by the liming. The effects on the total mycorrhizal colonization of the roots were opposite for the two years, indicating that the effects of liming are influenced strongly by other environmental factors. Statistical analysis also revealed pronounced natural variation in space. An inventory of the sporocarp-producing fungi showed that the number of saprotrophic species producing sporocarps was significantly higher in the limed plots whereas the number of ectomycorrhizal species was lower in the limed plots, compared with the control plots. It is concluded that more information is needed concerning the effects of liming on different soil types before any general conclusions can be made about its effects on mycorrhizal colonization.
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