Browsing Luonnontieteiden, metsätieteiden ja tekniikan tiedekunta by Author "Nykänen, Hannu"

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    • Arctic soil methane sink increases with drier conditions and higher ecosystem respiration 

      Voigt, Carolina; Virkkala, Anna-Maria; Hould Gosselin, Gabriel; Bennett, Kathryn A; Black, T Andrew; Detto, Matteo; Chevrier-Dion, Charles; Guggenberger, Georg; Hashmi, Wasi; Kohl, Lukas; Kou, Dan; Marquis, Charlotte; Marsh, Philip; Marushchak, Maija E; Nesic, Zoran; Nykänen, Hannu; Saarela, Taija; Sauheitl, Leopold; Walker, Branden; Weiss, Niels; Wilcox, Evan J; Sonnentag, Oliver (Springer Nature Limited, 2023)
      Arctic wetlands are known methane (CH4) emitters but recent studies suggest that the Arctic CH4 sink strength may be underestimated. Here we explore the capacity of well-drained Arctic soils to consume atmospheric CH4 using ...

    • Carbon storage change and δ13C transitions of peat columns in a partially forestry-drained boreal bog 

      Nykänen, Hannu; Rissanen, Antti J; Turunen, Jukka; Tahvanainen, Teemu; Simola, Heikki (Springer Science and Business Media LLC, 2019)
      Background and aims In forestry-drained peatlands, drying leads to changes in C cycling which could affect peat δ13C. Furthermore, the δ13C profile of the entire peat column may reveal effects of earlier climatic ...
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    • Ecosystem responses to increased organic carbon concentration: comparing results based on long-term monitoring and whole-lake experimentation 

      Kankaala, Paula; Arvola, Lauri; Hiltunen, Minna; Huotari, Jussi; Jones, Roger I; Nykänen, Hannu; Ojala, Anne; Olin, Mikko; Peltomaa, Elina; Peura, Sari; Rask, Martti; Tulonen, Tiina; Vesala, Sami (Informa UK Limited, 2019)
      Recent increases in terrestrial dissolved organic carbon (DOC) concentrations in northern inland waters have many ecological consequences. We examined available data on carbon cycles and food webs of 2 boreal headwater ...
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    • Gammaproteobacterial methanotrophs dominate methanotrophy in aerobic and anaerobic layers of boreal lake waters 

      Rissanen, Antti J; Saarenheimo, Jatta; Tiirola, Marja; Peura, Sari; Aalto, Sanni L; Karvinen, Anu; Nykänen, Hannu (Inter-Research Science Center, 2018)
      Small oxygen-stratified humic lakes of the boreal zone are important sources of methane to the atmosphere. Although stable isotope profiling has indicated that a substantial part of methane is already oxidized in the ...
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    • Lowered nutritional quality of prey decrease the growth and biomolecule content of rainbow trout fry 

      Taipale, Sami J.; Pulkkinen, Katja; Keva, Ossi; Kainz, Martin J.; Nykänen, Hannu (Elsevier Inc., 2022)
      Diet quality is crucial for the development of offspring. Here, we examined how the nutritional quality of prey affects somatic growth and the lipid, carbohydrate, protein, amino acid, and polyunsaturated fatty acid content ...

    • Lowering water table reduces carbon sink strength and carbon stocks in northern peatlands 

      Kwon, Min Jung; Ballantyne, Ashley; Ciais, Philippe; Qiu, Chunjing; Salmon, Elodie; Raoult, Nina; Guenet, Bertrand; Göckede, Mathias; Euskirchen, Eugénie S; Nykänen, Hannu; Schuur, Edward AG; Turetsky, Merritt R; Dieleman, Catherine M; Kane, Evan S; Zona, Donatella (John Wiley & Sons Ltd, 2022)
      Peatlands at high latitudes have accumulated >400 Pg carbon (C) because saturated soil and cold temperatures suppress C decomposition. This substantial amount of C in Arctic and Boreal peatlands is potentially subject to ...

    • Stable carbon isotopic composition of peat columns, subsoil and vegetation on natural and forestry-drained boreal peatlands 

      Nykänen, Hannu; Mpamah, Promise A; Rissanen, Antti J (, 2018)
      We studied natural and forestry-drained peatlands to examine the effect of over 34 years lowered water table on the δ13C values of vegetation, bulk peat and subsoil. In the seven studied sites, δ13C in the basal peat layer ...
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