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  • 1.
    Friberg, Nikolai
    et al.
    Department of Bioscience, Aarhus University, Silkeborg, Denmark.
    Bergfur, Jenny
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
    Rasmussen, Jes
    Department of Bioscience, Aarhus University, Silkeborg, Denmark.
    Sandin, Leonard
    Changing Northern catchments: Is altered hydrology, temperature or both going to shape future stream communities and ecosystem processes?2013Ingår i: Hydrological Processes, ISSN 0885-6087, E-ISSN 1099-1085, Vol. 27, nr 5, s. 734-740Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Global change is predicted to increase temperature substantially in the North as well as altering run-off regimes with less synchronicity as the importance of snow melt declines. River biota and ecosystem processes will be influenced across all levels of organization, both in concert and individually. It is of vital importance that the impacts, and their likely magnitude, can be identified in order to deploy suitable adaptation strategies at the catchment scale. In this paper, we re-analyse four data sets from studies conducted in Greenland (66–69oN), Iceland (64oN), Sweden (60oN) and Denmark (55–57oN) to try and tease out the likely impacts of water temperature and hydrology in shaping the stream communities and ecosystem processes in high-latitude catchments. Water temperature was the environmental variable that best explained macroinvertebrate community composition across latitudes. In contrast, no significant relationship between macroinvertebrate community composition and measures of hydraulic stability (or nutrients) was found. We found a strong linear relationship between decay rate of leaf litter and water temperature (r2 = 0.68; p < 0.0001) independent of latitudes. Our study suggests that temperature could be the primary driver of ecosystem change in future with northern catchments likely to be especially vulnerable.

  • 2.
    Wilk, Julie
    et al.
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
    Andersson, Lotta
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
    Plermkamon, Vichian
    Department of Agricultural Engineering, Khon Kaen University, Thailand.
    Hydrological impacts of forest conversion to agriculture in a large river basin in northeast Thailand2001Ingår i: Hydrological Processes, ISSN 0885-6087, E-ISSN 1099-1085, Vol. 15, nr 14, s. 2729-2748Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Small-scale experiments have demonstrated that forest clearance leads to an increase in water yield, but it is unclear if this result holds for larger river basins (> 1000 km(2)). No widespread changes in rainfall totals and patterns were found in the 12100 km(2) Nam Pong catchment in northeast Thailand between 1957 and 1995, despite a reduction in the area classified as forest from 80% to 27% in the last three decades. Neither were any detectable changes found in any other water balance terms nor in the dynamics of the recession at the end of the rainy season. When a hydrological model calibrated against data from the period before the deforestation was applied for the last years of the study period (1987-1995), runoff generation was however underestimated by approximately 15%, indicating increased runoff generation after the deforestation. However, this was mainly due to the hydrological response during one single year in the first period, when the Q/P ratio was very low. When excluding this year, neither analysis based on the hydrological model could reveal any significant change of the water balance due to the deforestation. More detailed land-use analysis revealed that shade trees were left on agricultural plots as well as a number of abandoned areas where secondary growth can be expected, which is believed to account for the results.

  • 3.
    Öberg, Gunilla
    et al.
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för tematisk utbildning och forskning, Miljövetenskap.
    Sandén, Per
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för tema.
    Retention of chloride in soil and cycling of organic matter-bound chlorine2005Ingår i: Hydrological Processes, ISSN 0885-6087, E-ISSN 1099-1085, Vol. 19, nr 11, s. 2123-2136Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Chloride (Cl-inorg) is generally considered to be a hydrologically and chemically inert substance. Past research suggests that Cl-inorg participates in a complex biogeochemical cycle involving the formation of organically bound chlorine (Cl-org). The present study examines whether Cl-org cycling is sufficiently extensive as to influence the geochemical cycling Of Cl-inorg- Undisturbed soil cores were collected in a coniferous forest soil in SE Sweden. The cores were stored in climate chambers for three months, irrigated with artificial rain, and the leachate was collected and analysed. The water balance of the lysimeters could be well described, and we found that 20-50% of the chlorine leached from the lysimeters was organically bound and that the amounts lost did not decrease with time. This strongly suggests that a substantial amount of Cl-inorg forms in topsoil, and that subsequent leaching to deeper layers causes a considerable withdrawal of Cl-inorg. The concentration of both organic carbon and Cl-inorg in the leachate was considerably higher than concentrations observed in the runoff in the actual catchment, suggesting that organic matter precipitates or is mineralized on its way through the soil. Copyright (c) 2005 John Wiley & Sons, Ltd.

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