lnu.sePublications
Change search
Refine search result
1 - 20 of 20
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Albrecht, Nina
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Olofsson, Erika
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Betydelsen av studentcentrerat lärande vid förmedling av professionsutbildning på distans2012In: NU2012 Gränslöst lärande, 2012Conference paper (Other (popular science, discussion, etc.))
  • 2.
    Bergh, Johan
    et al.
    Swedish University of Agricultural Sciences, Sweden.
    Blennow, Kristina
    Swedish University of Agricultural Sciences, Sweden.
    Andersson, Mikael
    Swedish University of Agricultural Sciences, Sweden.
    Olofsson, Erika
    Swedish University of Agricultural Sciences, Sweden.
    Nilsson, Urban
    Swedish University of Agricultural Sciences, Sweden.
    Sallnäs, Ola
    Swedish University of Agricultural Sciences, Sweden.
    Karlsson, Matts
    Swedish University of Agricultural Sciences, Sweden.
    Effekter av ett förändrat klimat på skogen och implikationer för skogsbruket: Bilaga B 19, Arbetsrapport 342007In: Sverige inför klimatförändringarna: hot och möjligheter, Fritzes, 2007, p. 1-71Chapter in book (Other (popular science, discussion, etc.))
    Abstract [sv]

    Att klimatet kan komma att förändras påverkar svenskt skogsbruk. Skogen har i sig en direkt inverkan på klimatet samtidigt som skogsbruket kan behöva anpassas till de nya förhållandena. Ett osäkert klimat sätter brukandet av skogen i ett nytt läge som vi inte har någon tidigare erfarenhet av. Scenarier för framtida klimatutveckling är behäftade med stor osäkerhet och de förväntade effekterna på skogen blir således ännu mer osäkra. Trots detta kan man ändå förutsäga några sannolika huvuddrag i effekterna på den svenska skogen vid ett framtida ändrat klimat. En ökad potential för biomassaproduktion kan förväntas, liksom ökade möjligheter att använda nya arter i skogsbruket. Samtidigt ökar sannolikt risken för vissa typer av skador.

    Att väga eventuella fördelar i form av ökad produktion och ökade möjligheter i trädslagsval mot ökade risker för skador är viktigt för att ge samhället ett helhetsperspektiv och för att en större grupp ska ha möjlighet att ta till sig frågan. Det är också viktigt att i största möjliga mån kvantifiera eller ge ramarna i ekonomiska termer för hur det förändrade klimatet kan tänkas påverka skogsbruket. Vidare kan det vara styrande för prioritering av fortsatta forskningsarbeten och riskbedömning och för att prioritera åtgärder. Därför har vi försökt utifrån befintlig kunskap idag, konstruera en Tabell över den ekonomiska betydelsen och forskningsbarheten för olika risk/ämnesområden (se Tabell 17 sidan 39). De kanske största effekterna av ett förändrat klimat på ekonomin inom skogsbruket skulle vara om vi lyckas utnyttja den ökade produktionspotentialen. Det förutsätter att vi kan bemästra de negativa effekterna i första hand av en ökad risk för vindfällning, skadeangrepp från insekter och svampar. Mot bakgrund av skogsbrukets stora betydelse som naturresurs och industriell bas, så finner vi att det är viktigt att vi står rustade inför en framtid med såväl ökade hot som nya möjligheter.

    I denna skrift försöker vi beskriva och analysera tänkbara effekter av ett förändrat klimat på skogen och bedömt deras implikationer för produktionsskogsbruket. Andra aspekter än produktionsaspekter på skogsbruket har inte behandlats. Analysen sker i fyra steg. Vi inleder med att, så långt nuvarande kunskapsläge tillåter, kvantifiera effekterna på den skogliga primärproduktionen – tillväxten i skogen. I ett andra steg omsätts dessa effekter till effekter på produktionsekonomin i ett bestånd. Därefter analyseras tänkbara effekter på risken för stormfällning i skogen. I ett sista steg breddas diskussionen till en något mera spekulativ bild av tänkbara effekter på skogsbrukets ekonomi.

  • 3.
    Blennow, Kristina
    et al.
    Swedish University of Agricultural Sciences (SLU).
    Andersson, Mikael
    Swedish University of Agricultural Sciences (SLU).
    Bergh, Johan
    Swedish University of Agricultural Sciences (SLU).
    Sallnäs, Ola
    Swedish University of Agricultural Sciences (SLU).
    Olofsson, Erika
    Swedish University of Agricultural Sciences (SLU).
    Potential climate change impacts on the probability of wind damage in a south Swedish forest2010In: Climatic Change, ISSN 0165-0009, E-ISSN 1573-1480, Vol. 99, no 1-2, p. 261-278Article in journal (Refereed)
    Abstract [en]

    We estimated how the possible changes in wind climate and state of the forest due to climate change may affect the probability of exceeding critical wind speeds expected to cause wind damage within a forest management unit located in Southern Sweden. The topography of the management unit was relatively gentle and the forests were dominated by Norway spruce (Picea abies (L.) Karst.). We incorporated a model relating the site index (SI) to the site productivity into the forest projection model FTM. Using estimated changes in the net primary production (NPP) due to climate change and assuming a relative change in NPP equal to a relative change in the site productivity, we simulated possible future states of the forest under gradual adjustment of SI in response to climate change. We estimated changes in NPP by combining the boreal-adapted BIOMASS model with four regional climate change scenarios calculated using the RCAO model for the period 2071–2100 and two control period scenarios for the period 1961–1990. The modified WINDA model was used to calculate the probability of wind damage for individual forest stands in simulated future states of the forest. The climate change scenarios used represent non-extreme projections on a 100-year time scale in terms of global mean warming. A 15–40% increase in NPP was estimated to result from climate change until the period 2071–2100. Increasing sensitivity of the forest to wind was indicated when the management rules of today were applied. A greater proportion of the calculated change in probability of wind damage was due to changes in wind climate than to changes in the sensitivity of the forest to wind. While regional climate scenarios based on the HadAM3H general circulation model (GCM) indicated no change (SRES A2 emission scenario) or a slightly reduced (SRES B2 emission scenario) probability of wind damage, scenarios based on the ECHAM4/OPYC3 GCM indicated increased probability of wind damage. The assessment should, however, be reviewed as the simulation of forest growth under climate change as well as climate change scenarios are refined.

  • 4.
    Blennow, Kristina
    et al.
    SLU.
    Andersson, Mikael
    SLU.
    Sallnäs, Ola
    SLU.
    Olofsson, Erika
    SLU.
    Climate change and the probability of wind damage in two swedish forests2008In: Adaptation of Forests and Forest Management to Changing Climate with Emphasis on Forest Health: a Review of Science, Policies, and Practices., Umeå, 2008, p. 39-Conference paper (Other academic)
  • 5.
    Blennow, Kristina
    et al.
    Sveriges Lantbruksuniversitet (SLU).
    Andersson, Mikael
    Sallnäs, Ola
    Olofsson, Erika
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Climate change and the probability of wind damage in two Swedish forests2010In: Forest Ecology and Management, ISSN 0378-1127, E-ISSN 1872-7042, Vol. 259, p. 818-830Article in journal (Refereed)
    Abstract [en]

    We simulated how possible changes in wind and ground-frost climate and state of the forest due to changes in the future climate may affect the probability of exceeding critical wind speeds expected to cause wind damage within one northern and one southern study area in Sweden, respectively. The topography of the study areas was relatively gentle and the forests were dominated by Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris L.). Using estimated changes in the net primary production (NPP) due to climate change and assuming a relative change in the site productivity equal to a relative change in NPP, we simulated possible future states of the forest under gradual adjustment of the site index in response to climate change using the model The Forest Time Machine. Global climate change scenarios based on two emission scenarios and one general circulation model were downscaled to the regional level. The modified WINDA model was used to calculate the sensitivity of the forest to wind and the probability of wind damage for individual forest stands for the periods 2011–2041 and 2071–2100 and for a control period 1961–1990. This was done while taking into account effects on stability of the forest from expected changes in the occurrence of ground frost. Increasing sensitivity of the forest to wind was indicated for both study areas when adhering to recommended management rules of today. Adding also a changed wind climate further increased the probability of wind damage. Calculated probabilities of wind damage were generally higher in the southern study area than in the northern one and were explained by differences in wind climate and the state of the forests, for example with respect to tree species composition. The indicated increase in sensitivity of the forest to wind under the current management regime, and possibly increasing windiness, motivate further analysis of the effects of different management options on the probability of wind damage and what modifications of Swedish forest management are possibly warranted.

  • 6.
    Blennow, Kristina
    et al.
    SLU.
    Olofsson, Erika
    SLU.
    Att gallra eller inte gallra - det är frågan2002In: Osäkerhet och aktiv riskhantering, SUFOR , 2002, p. 8-10Chapter in book (Other academic)
  • 7.
    Blennow, Kristina
    et al.
    Swedish University of Agricultural Sciences.
    Olofsson, Erika
    Swedish University of Agricultural Sciences.
    Kan man undvika stormskador?2004In: Osäkerhet och aktiv riskhantering: aspekter på osäkerhet och risk i sydsvenskt skogsbruk / [ed] Kristina Blennow, Alnarp: Sustainable Forestry in Southern Sweden (SUFOR) , 2004, 1, p. 39-43Chapter in book (Other academic)
  • 8.
    Blennow, Kristina
    et al.
    SLU.
    Olofsson, Erika
    SLU.
    Models for predicting the probability of wind damage as decision support in forest management2003In: Decision support for multiple purpose forestry: a transdisciplinary conference on the development and application of decision support tools for forest management, Vienna: University of Natural Resources and Applied Life Sciences , 2003Conference paper (Other academic)
  • 9.
    Blennow, Kristina
    et al.
    Swedish University of Agricultural Sciences, Sweden.
    Olofsson, Erika
    Swedish University of Agricultural Sciences, Sweden.
    Sallnäs, Ola
    Swedish University of Agricultural Sciences, Sweden.
    Evaluating WINDA: a tool for assessing the probability of wind damage to forest stands2003In: Proceedings of the International Conference Wind Effects on Trees: 16-18 September 2003, University of Karlsruhe, Germany / [ed] B. Buck, C. Kottmeier, C., Mattheck, C. Quine, G. Wilhelm, 2003, p. 137-144Conference paper (Other academic)
    Abstract [en]

    WINDA is an integrated system of models for calculating the stand-wise probability of wind damage of trees within a landscape (Blennow & Sallnäs, submitted). It integrates a modified version of the dose/response model HWIND (Peltola et al., 1999), the airflow model WASP (Mortensen et al., 1998), and a component for calculating the zero-plane displacement and surface roughness. WINDA uses a GIS for geographical computations. The calculations are made point-wise at exposed stand edges and the results are combined for each stand. The likelihood of damage is calculated using extreme value theory. The mechanistic modelling approach makes WINDA useful for evaluating effects on the probability of wind damage of silvicultural treatments and forestry activities as well as of a changed climate. This paper briefly outlines WINDA and evaluates output by comparing predicted damage with observed damage for two landscapes in southern Sweden.

  • 10. Blennow, Kristina
    et al.
    Olofsson, Erika
    Sallnäs, Ola
    WINDA - a tool for assessing the probability of wind damage to forest stands.2003In: Proceedings of the international conference Wind Effects on Trees., Karlsruhe, 2003, p. 137-144Conference paper (Other academic)
  • 11.
    Domeij, Erika
    et al.
    SLU.
    Blennow, Kristina
    SLU.
    Model assessments of windthrow probabilities as decision support in forest planning2002In: Incoporating Empirical and Process-based Models into Decision-support Tools for Sustainable Forest Management, 2002Conference paper (Other academic)
  • 12.
    Olofsson, Erika
    Sveriges Lantbruksuniversitet.
    Decision support in forestry2005In: Proceedings of the international conference Uncertainty and Active Risk Management in Agriculture and Forestry., Alnarp, 2005, p. 74-78Conference paper (Other academic)
  • 13. Olofsson, Erika
    Precommenrcial thinning in Norway spruce plantations2009In: International conference on spruce in the context of global change, 2009Conference paper (Other academic)
  • 14.
    Olofsson, Erika
    Southern Swedish Forest Research Centre.
    Supporting Management of the Risk of Wind Damage in South Swedish Forestry2006Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Private forest owners in southern Sweden consider wind damage to be one of the most problematic risks from an economic perspective. A potential climate change also raises the question of the possible impact of such a climate change on the risk of wind damage. Taking into consideration the spatial aspects, and the uncertain occurrence of windstorms over time and in space, this thesis aims at providing information to support the management of the risk of wind damage in south Swedish forestry. Computer models were used to assess the probability of wind damage to forest stands, and to project forest stands within case study landscapes in southern Sweden.

    Although the topography is relatively gently in southern Sweden, it significantly influences the probability of wind damage on a landscape scale. A possible cost-effective means to manage the risk of wind damage can be to target risk-reducing forestry measures to topographically induced wind exposed locations. To support the targeting of riskreducing forestry measures a tool was constructed, accounting for different risk-preferences among forest owners, for the identification of stands with a high probability of wind damage. The results emphasize the possibility to reduce the risk of wind damage by spatial forestry planning, taking wind shelter from topographic features and surrounding stands into consideration.

    Based on regional climate change scenarios, it cannot be ruled out that a climate change can lead to an increasing probability of wind damage in southern Sweden. In southernmost Sweden, a climate change very likely can lead to an increasing probability of wind damage. With implications for spatial forestry planning, the probability of strong wind from the sector west to southwest is indicated to remain comparatively high. Shortening the lengths of rotation periods appears to be one possible means for forestry in southern Sweden to adapt to climate change.

  • 15.
    Olofsson, Erika
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Albrecht, Nina
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Jakobsson, Rikard
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Examinationsformer med anställningsbarhet som mål2012In: NU2012 Gränslöst lärande, 2012Conference paper (Other (popular science, discussion, etc.))
  • 16.
    Olofsson, Erika
    et al.
    Swedish University of Agricultural Sciences.
    Blennow, Kristina
    Swedish University of Agricultural Sciences.
    Decision support for identifying spruce forest stand edges with high probability of wind damage2005In: Forest Ecology and Management, ISSN 0378-1127, E-ISSN 1872-7042, Vol. 207, no 1-2, p. 87-98Article in journal (Refereed)
    Abstract [en]

    In multiple-purpose forestry, windstorms affect both the ecological and economic values that forest stands represent. Silvicultural treatments and forest planning can reduce the probability of wind damage. A tool for the identification of spruce stands with a high probability of wind damage, aimed at helping forestry practitioners target such measures, is presented. Initial assessments of the annual probability of wind damage of exposed stand edges were made for a landscape of about 1200 ha in southern Sweden, using the WINDA system of models. In the calculations, each edge was classified as having either a high or a low annual probability of wind damage. Decision tree methodology using easily accessible variables was employed for identifying the edges classified as having a high probability of wind damage. Since in a multiple-use situation, the risk preferences of decision makers differ, one decision tree was constructed for each of three threshold probabilities of wind damage: 5, 10, and 20%. This corresponds to disturbance intervals of 20, 10, and 5 years or less in each case. The decision trees were found to correctly classify 64–71% of the high-probability stand edges, the misclassification rate for the low-probability stand edges being 12–26%. Alternative cost-matrices were used to take account of user-preferences regarding misclassification rates in the model output. Among the most important predictor variables used in the decision trees were stem taper, gap size in front of the stand edge, and the direction of wind exposure. In an evaluation landscape located 250 km from the parameterization landscape, the decision trees were found to correctly classify 44–50% and 0–83% of the high-probability stand edges with and without use of cost-matrices, respectively. For the evaluation landscape, a statistically significant difference between classifications produced by the decision tree approach and a set of randomly classified stand edges was obtained just for four of the decision trees. This result was explained in terms of the high degree of complexity of the underlying processes, limitations in the parameterization data set, and differences between the landscapes involved. Decision trees of the type described can thus provide help in practical forestry within and nearby the landscape used for constructing the decision trees. In general, the presented methodology appears to be suitable for developing management decision support tools.

  • 17.
    Olofsson, Erika
    et al.
    Swedish University of Agricultural Sciences.
    Blennow, Kristina
    Swedish University of Agricultural Sciences.
    The probability of wind damage in forestry under a changed wind climate2008In: Climatic Change, ISSN 0165-0009, E-ISSN 1573-1480, Vol. 87, no 3, p. 347-360Article in journal (Refereed)
    Abstract [en]

    We (1) estimated how the possible changes in wind climate due to climatic change may affect the probability of exceeding critical wind speeds (CWS) expected to cause significant wind damage within a forest management unit located in southern Sweden, (2) analysed how the probability of exceeding an approximate CWS as observed in the management unit would change in different regions in Sweden if expecting a similar kind of forested area to occur in different geographical locations. The topography of the management unit was relatively gentle and the forests were dominated by Norway spruce (Picea abies (L.) Karst.). Seven regions across Sweden were selected for comparison of possible future probability of damaging wind speed. The model-system WINDA was modified and used for calculations of the probability of wind damage together with regionally downscaled climate change scenario (CCS) data. In total, two climate scenarios downscaled using the RCAO model for the control period 1961–1990 and four for the period 2071–2100 were used. The CCSs represent fairly central projections on a 100-year time scale in terms of global mean warming. Although there is ambiguity between different CCSs, the results indicated that the present pattern of more windy conditions in southern than in northern Sweden will remain. For most sites the probability of exceeding the CWS from westerly to south-westerly directions was indicated to remain comparatively high and the probability of damaging wind from south-westerly to south-easterly directions was indicated to increase in many places. For southernmost Sweden increasing probability of exceeding the CWS from the north-westerly to south-easterly wind directions were indicated for all but one CCS. The results were discussed with respect to spatial planning in forestry under a changing wind climate.

  • 18.
    Olofsson, Erika
    et al.
    SLU.
    Elfving, Björn
    SLU.
    A method to estimate leaf area and biomass of old Scots pine trees with image analysis2001In: Forest modelling for ecosystem management, forest certification and sustainable management / [ed] LeMay, V. & Marshall, P., UBC, Canada, 2001Conference paper (Other academic)
  • 19.
    Olofsson, Erika
    et al.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Vallin Rosell, Monika
    Lyckas skogsägare med ekonomiskt intresse bättre med biologisk mångfald?: En uppföljning av landsbygdsprogrammets ädellövsplanteringar2016In: Västra Sveriges Skogsvårdsförbund, Årskrift 2018, , p. 2p. 22-23Article in journal (Other (popular science, discussion, etc.))
  • 20. Solberg, S
    et al.
    Harstveit, K
    Blennow, K
    Olofsson, Erika
    Heggem, E
    Timmerman, V
    Storm and forest damage: the risk of storm damage in forests, and the importance of forest management2008Report (Other academic)
1 - 20 of 20
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf