Browsing Brage NMBU by Author "de Wit, Heleen"
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Afforestation of a pasture in Norway did not result in higher soil carbon, 50 years after planting
Strand, Line Tau; Fjellstad, Wendy Jane; Jackson-Blake, Leah Amber; de Wit, Heleen (Peer reviewed; Journal article, 2020)Afforestation of marginal cultivated land is an internationally approved climate mitigation strategy, however, with uncertain implications for soil organic carbon (SOC) storage. We examined the effect of forest planting ... -
Boreal Headwater Catchment as Hot Spot of Carbon Processing From Headwater to Fjord
Clayer, Francois; Thrane, Jan-Erik; Brandt, Uta; Dörsch, Peter; de Wit, Heleen (Peer reviewed; Journal article, 2021)Boreal headwaters and aquatic sediments are significant transporters, stores and processors of terrestrial carbon (C) as well as emitters of greenhouse gases (GHGs), mainly CO2 and CH4. While terrestrial ecosystems are net ... -
Catchment properties as predictors of greenhouse gas concentrations across a gradient of boreal lakes
Valiente Parra, Nicolas; Eiler, Alexander; Allesson, Lina; Andersen, Tom; Clayer, Francois; Crapart, Camille Marie; Dörsch, Peter; Fontaine, Laurent; Heuschele, Jan David; Vogt, Rolf David; Wei, Jing; de Wit, Heleen; Hessen, Dag Olav (Peer reviewed; Journal article, 2022) -
Factors Governing Site and Charge Density of Dissolved Natural Organic Matter
Vogt, Rolf David; Garmo, Øyvind Aaberg; Austnes, Kari; Kaste, Øyvind; Haaland, Ståle Leif; Sample, James Edward; Thrane, Jan-Erik; Skancke, Liv Bente; Gundersen, Cathrine Brecke; de Wit, Heleen (Peer reviewed; Journal article, 2024) -
Organic matter decomposition and mercury mobilization in thawing subarctic permafrost peat plateaus
Nedkvitne, Nora (Master thesis, 2021)Mercury (Hg) is a highly potent neurotoxin which is naturally present in the environment. A vast amount of the global Hg is stored in Arctic permafrost soils, immobilized by complexation with organic matter (OM). With an ... -
Sheep grazing effects on soil carbon and nitrogen and implications for runoff water quality at a low alpine site in southern Norway
Martinsen, Vegard (2011;2011:10, Doctoral thesis, 2011)Grazing in outlying fields has a long history and is important in local communities worldwide. Alpine ecosystems, representing a large proportion of the land area in Europe, are under pressure from changes in climate and ... -
Spatial and temporal trends of mercury in freshwater fish in Fennoscandia (1965-2015)
Braaten, Hans Fredrik Veiteberg; Åkerblom, Staffan; de Wit, Heleen; Skotte, Gunnar; Rask, Martti; Vuorenmaa, Jussi; Kahilainen, Kimmo K.; Malinen, Tommi; Rognerud, Sigurd; Lydersen, Espen; Amundsen, Per-Arne; Kashulin, Nicholas; Kashulina, Tatiana; Terentyev, Petr; Christensen, Guttorm; Jackson-Blake, Leah Amber; Lund, Espen; Rosseland, Bjørn Olav (NIVA-rapport, Research report, 2017)Mercury (Hg) emissions to the atmosphere cause elevated Hg levels in fish, even in many remote regions of the world. Here we present an extensive database of more than 50 000 measurements of Hg in fish, including 2 775 ...