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  • 1.
    Backman, J.S.K.
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Biologi. Linköpings universitet, Tekniska högskolan.
    Klemedtsson, A.K.
    Klemedtsson, Å.K., Dept. of Informatics and Mathematics, Univ. of Trollhättan/Uddevalla, SE-46129 Trollhättan, Sweden.
    Increased Nitrification in Acid Coniferous Forest Soil Due to High Nitrogen Deposition and Liming2003Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 18, nr 6, s. 514-524Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study investigated whether liming stimulates the potential nitrification of acid forest soils in southern Sweden, and whether such stimulation (if present) is more pronounced in areas receiving high nitrogen (N) deposition. A short-term (30 h) soil-slurry incubation technique was used, which reduces the risk of bacterial growth, nitrate immobilization and denitrification during the incubation. The nitrate and nitrite produced were measured after biological conversion to nitrous oxide. The investigation was performed 6-7 yrs after the liming at four coniferous forest sites in the central and western parts of southern Sweden, which receive low and high deposition of N, respectively. Overall, liming had increased pH significantly down to 10 cm soil depth, but at 20 cm depth there was no difference between the limed and non-limed soil. In cases when liming had affected the total N pool and the potential nitrification, this was also limited to the uppermost 10 cm. It seems likely that the effects of liming on the potential nitrification were dependent on N availability, which is in turn influenced by N mineralization, trees' demands for N, and atmospheric N inputs. The strongest stimulatory effect of liming on the potential nitrification was seen on the west coast, indicating that these sites had the highest availability of ammonia for nitrifiers. However, liming also increased nitrification at one of the sites in south-central Sweden, which could have been mediated by increased rates of N mineralization.

  • 2.
    Brege, Staffan
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell marknadsföring och industriell ekonomi. Linköpings universitet, Tekniska högskolan.
    Nord, Tomas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell marknadsföring och industriell ekonomi. Linköpings universitet, Tekniska högskolan.
    Sjöström, Roland
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell marknadsföring och industriell ekonomi. Linköpings universitet, Tekniska högskolan.
    Stehn, Lars
    Structural Engineering, Civil, Mining and Environmental Engineering , Luleå University of Technology , Luleå, Sweden.
    Value-added strategies and forward integration in the Swedish sawmill industry: positioning and profitability in the high-volume segment2010Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 25, nr 5, s. 482-493Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The changing market conditions for the Swedish sawmill industry place a focus on a better understanding of the pros and cons of value-added and forward integration strategies. The purpose of this article is to describe and explain recent value-added strategies in the Swedish sawmill industry. The study includes strategies from 13 of the 15 largest sawmill companies for the period between 2002 and 2005, describing a differentiation between value added in primary sawmill production and forward integration into secondary production. It also aims to relate some basic conditions, such as company size, company growth and corporate strategy, to value added and forward integration to profitability. The results show strong positive and significant correlations between forward integration, value added in primary production (somewhat weaker) and unit revenue, and profitability measured as return on investment. There were no strong or significant correlations between size and profitability, playing down the importance of economies of scale (among these already large companies). An interesting result is the much higher profitability of the buying sawmill companies compared with the forest corporations, stressing the importance of both a long-term strategy when investing in value-added activities and ultimately the priorities of ownership.

  • 3.
    Karlsson, Jenny
    et al.
    Linköpings universitet, Matematiska institutionen, Optimeringslära. Linköpings universitet, Tekniska högskolan.
    Rönnqvist, Mikael
    Department of Finance and Management Science, Norwegian School of Economics and Business Administration, Bergen, Norway and The Forestry Research Institute of Sweden (Skogforsk), Uppsala, Sweden.
    Frisk, Mikael
    The Forestry Research Institute of Sweden (Skogforsk), Uppsala, Sweden.
    RoadOpt: a decision support system for road upgrading in forestry2006Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 21, nr S7. 7, s. 5-15Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Road blocking due to thawing or heavy rains annually contributes to a considerable loss of profit in Swedish forestry. Companies have to build large stocks of sawlogs and pulplogs to secure a continuous supply during periods where the accessibility of the road network is uncertain. This storage leads to quality deterioration, which means loss in profit. One approach to reduce the losses due to blocked roads is to upgrade the road network to a standard that guarantees accessibility throughout the year. This article describes a decision support system called RoadOpt for the planning of forest road upgrading. The planning horizon is about one decade. The system uses a Geographical Information System (GIS)-based map user interface to present and analyse data and results. Two important modules are the Swedish road database, which provides detailed information about the road network, and an optimization module consisting of a mixed integer linear programming model. A case study from a major Swedish company is presented.

  • 4.
    Todoroki, C
    et al.
    Forest Res, Rotorua, New Zealand Linkoping Univ, Div Optimizat, SE-58183 Linkoping, Sweden.
    Rönnqvist, Mikael
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Matematiska institutionen, Optimeringslära.
    Dynamic control of timber production at a sawmill with log sawing optimization2002Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 17, nr 1, s. 79-89Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Today most sawmills use optimization techniques to maximize yields from logs. If open market conditions are assumed when maximizing volume or value yields, overproduction of some products and underproduction of others may result. In this study, a system is described that links production with log sawing optimization while also addressing demands for timber products of differing qualities. The system is based on an optimization framework that is implemented in a log sawing simulator, AUTOSAW. Unlike other optimization systems that use static product "values" such as board volume or timber price, dynamic values are used that are updated regularly according to previous timber production. The efficiency of the system was tested with three orderbooks, via comparisons with volume- and value-optimized solutions obtained from sawing pruned Pinus radiata D. Don logs. In each case, product optimization required fewer logs to satisfy all demands than did either volume or value optimization. Furthermore, underproduction was eliminated and overproduction reduced.

  • 5.
    Von Arnold, Karin
    et al.
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
    Ivarsson, Maria
    Botanical Institute, Göteborg University, Göteborg, Sweden.
    Öqvist , Mats
    Department of Forest Ecology, Swedish University of Agricultural Sciences, Umå, Sweden.
    Majdi, Hooshang
    Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Björk , Robert G.
    Botanical Institute, Göteborg University, Göteborg, Sweden.
    Weslien, Per
    Botanical Institute, Göteborg University, Göteborg, Sweden.
    Klemedtsson, Leif
    Botanical Institute, Göteborg University, Göteborg, Sweden.
    Can distribution of trees explain variation in nitrous oxide fluxes?2005Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 20, nr 6, s. 481-489Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The impact of distance to tree stems on nitrous oxide (N2O) fluxes was examined to determine whether it is possible to improve the accuracy of flux estimates from boreal forest soils. Dark static chambers were placed along transects between pairs of trees within a Norway spruce stand and fluxes of N2O and carbon dioxide (CO2) were measured during the period 1999-2003. The groundwater table was measured on every sampling occasion along the transects. In addition, radiation transmission, potential diffusion rate and biomass of forest floor vegetation were measured once at each chamber site along one of the transects and soil samples were collected at three depths, from which pH, denitrification enzyme activity, soil moisture, organic matter, and carbon and nitrogen content were determined. There was a high level of variation in the N2O fluxes, both spatially and temporally. However, the spatial variation in the N2O fluxes within the transect could not be explained by differences in any of the measured variables. Sometimes, mainly when no major peaks occurred, N2O fluxes were significantly correlated with CO2 release. It is concluded that distance to stems cannot be used to improve the design of sampling schemes or for extrapolating flux levels to larger scales.

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