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  • 1.
    Berglund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    The Holocene shore displacement of Gästrikland, eastern Sweden: A contribution to the knowledge of Scandinavian glacio-isostatic uplift2005In: Journal of Quaternary Science, ISSN 0267-8179, Vol. 20, no 6, p. 519-531Article in journal (Refereed)
    Abstract [en]

    The shore displacement in Gästrikland, east-central Sweden, has been investigated by means of AMS radiocarbon dating of sediment cores from isolated basins. Twenty dates from 11 sites are presented. Pollen and diatom analyses, and archive material from the Geological Survey of Sweden, have been used to identify isolation intervals in the cores and as chronological support to the 14C dates. An important pollen stratigraphical time-marker is a distinct mid-Holocene increase in Tilia. For the mid-Holocene, pollen stratigraphy is used rather than the 14C dates for the age determination. The deglaciation of Gästrikland, according to the new 14C dates, took place ca. 11 000 cal. yr BP (ca. 9500 14C yr BP). Through the Holocene the shore displacement is regressive. The regression was initially rapid (on average ca. 3.5 m per 100 yr 11 000-7500 cal. yr BP, probably much more rapid at the earliest stage), then slowed down considerably and was from ca. 5000 cal. yr BP (probably already from 7000 cal. yr BP) relatively constant, ca. 0.8-0.9 m per 100 yr. There are important differences between the shore level curve from Gästrikland and curves from other areas, indicating some irregularities in the regional glacio-isostatic rebound.

  • 2.
    Dahlström, Niklas
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Jönsson, Karin
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Input processes and decomposition rates of large woody debris in a boreal forest stream2001In: Tree Rings and People: An International Conference on the Future of Dendrochronology, Davos, Switzerland September 22-26, 2001, 2001Conference paper (Other academic)
  • 3.
    Dahlström, Niklas
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Jönsson, Karin
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Nilsson, Christer
    Long-term dynamics of large woody debris in a managed boreal forest stream.2005In: Forest Ecology and Management, ISSN 0378-1127, E-ISSN 1872-7042, Vol. 210, no 1-3, p. 363-373Article in journal (Refereed)
    Abstract [en]

    Little is known about how past forest management in Sweden influenced the quantity and quality of large woody debris (LWD) in streams. The present study provides information of the long-term dynamics of LWD in a reach of a boreal stream intersecting a managed forest. Dendrochronological methods were used to reconstruct mortality years of the pieces of LWD and the general history of fire and cuttings of the surrounding riparian forest. Today, spruce dominates among the living trees, whereas the LWD is dominated by birch in the forest and by pine in the stream. Fire frequency prior to active fire suppression was similar to values reported from boreal forests. Pine trees were more abundant in the riparian forest before selective logging operations and active fire suppression began in the 1800s. Many of the pieces of LWD found in the stream today died more than 200 years ago and derived from a cohort of pines that generated in the early 1600s. Pine LWD in stream channels is highly resistant to decomposition and can reside for more than 300 years. A substantial amount of the LWD found today in managed forest streams in boreal Sweden most likely derives from the time before extensive human influence and is likely to decrease further in the future. Management of riparian forests to ascertain future supply of long-lived LWD in streams should target to increase the proportion of pine trees.

  • 4.
    Jonsson, Karin
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Nilsson, Christer
    Scots Pine (pinus sylvestris L.) on Shingle Fields: A Dendrochronologic Reconstruction of Early Summer Precipitation in Mideast Sweden2009In: Journal of Climate, ISSN 0894-8755, E-ISSN 1520-0442, Vol. 22, no 17, p. 4710-4722Article in journal (Refereed)
    Abstract [en]

    Scots pine (Pinus sylvestris L.) trees growing on shingle fields offer a unique possibility to reconstruct precipitation and study climate variability in the fairly humid eastern part of central Sweden. Tree-ring characteristics were compared with monthly (1890-2001) and daily (1961-2001) climate data from an adjacent meteorological station. Chronologies for latewood (LW), earlywood (EW), and tree-ring widths (RW) were constructed from 73 living and dead trees. Correlation analyses show that tree growth is most sensitive to early summer precipitation. EW shows the strongest correlation with precipitation in May and June while LW is best correlated with June and July precipitation. A reconstruction model for May-June precipitation was calculated using principal component analysis (PCA) regression (regular regression) including EW, LW, and RW for present and previous years. The model explained 46% of the variation in May-June precipitation and allowed a reconstruction back to 1560. Information about wet and dry years was collected from historical documents and was used to validate the result. Periods with precipitation above and below the mean show agreement with previous reconstructions of spring precipitation from tree rings in Finland and of spring floods from estuary sediments in the region. Analyses of correlations between meteorological stations and reconstructed precipitation show that the model is valid for the coastal part of central Sweden. The authors conclude that Scots pine trees on shingle fields are well suited for precipitation reconstruction, and the separate analyses of LW and EW improve the reconstruction.

  • 5.
    Jönsson, Karin
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    A dendrohydrological method for reconstruction of river flow in the Swedish boreal zone: Tree Rings and People - An International Conference on the Future of Dendrochronology2001Conference paper (Other academic)
  • 6.
    Jönsson, Karin
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Possibilities to reconstruct long-term changes in flood disturbances in the boreal riparian zone.2003In: The Ecology and Management of Wood in World Rivers, Bethesda, Maryland: American Fisheries Society , 2003Conference paper (Other academic)
  • 7.
    Jönsson, Karin
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Reconstruction of riverflow in the Swedish boreal zone2001In: Detecting environmental change: science and society, 17-20 july 2001, London, UK, 2001Conference paper (Other academic)
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