HANNU NYKäNEN

Contact info

Keywords

Teaching Activities

Research groups - UEF

• 
  Biogeochemistry research group
• 
  Water research

Links

• Research gate Hannu Nykänen
• Orcid Orcid HN

Publications

• Bhattarai, Hem Raj; Wanek, Wolfgang; Siljanen, Henri M P; Ronkainen, Jussi G; Liimatainen, Maarit; Hu, Yuntao; Nykänen, Hannu; Biasi, Christina; Maljanen, Marja. 2021. Denitrification is the major nitrous acid production pathway in boreal agricultural soils Communications earth & environment 2 1: 54. 2021
• Rissanen, Antti J; Saarela, Taija; Jäntti, Helena; Buck, Moritz; Peura, Sari; Aalto, Sanni L; Ojala, Anne; Pumpanen, Jukka; Tiirola, Marja; Elvert, Marcus; Nykänen, Hannu. 2021. Vertical stratification patterns of methanotrophs and their genetic controllers in water columns of oxygen-stratified boreal lakes Fems microbiology ecology 97 2: fiaa252. 2021
• Hiltunen, Minna; Nykänen, Hannu; Syväranta, Jari. 2021. The influence of lipid content and taxonomic affiliation on methane and carbon dioxide production from phytoplankton biomass in lake sediment Limnology and oceanography 66 5: 1915-1925. 2021
• Bhattarai, Hem Raj; Liimatainen, Maarit; Nykänen, Hannu; Kivimäenpää, Minna; Martikainen, Pertti J; Maljanen, Marja. 2019. Germinating wheat promotes the emission of atmospherically significant nitrous acid (HONO) gas from soils Soil biology and biochemistry 136: 107518. 2019
• 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. 2019. Ecosystem responses to increased organic carbon concentration: comparing results based on long-term monitoring and whole-lake experimentation Inland waters 9 4: 489-502. 2019
• Nykänen, Hannu; Rissanen, Antti J; Turunen, Jukka; Tahvanainen, Teemu; Simola, Heikki. 2019. Carbon storage change and δ13C transitions of peat columns in a partially forestry-drained boreal bog Plant and soil 2020; 447: 365-378. 2019
• Rissanen, AJ; Peura, S; Mpamah, PA; Taipale, S; Tiirola, M; Biasi, C; Mäki, A; Nykänen, H. 2019. Vertical stratification of bacteria and archaea in sediments of a small boreal humic lake Fems microbiology letters 366 5: fnz044. 2019
• Stable Carbon Isotopic Composition Transitions of Peat Columns in a Partially Forestry-Drained Boreal Bog. Nykänen, H; Rissanen, AJ; Turunen, J; Tahvanainen, T; Simola, H / Proceedings of the Center of Excellence in Atmospheric Sciences (CoE ATM) Annual Seminar 2019. 2019. 2019
• Voigt, C; Marushchak, ME; Mastepanov, M; Lamprecht, RE; Christensen, TR; Dorodnikov, M; Jackowicz-Korczynski, M; Lindgren, A; Lohila, A; Nykänen, H; Oinonen, M; Oksanen, T; Palonen, V; Treat, CC; Martikainen, PJ; Biasi, C. 2019. Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw Global change biology 25 5: 1746-1764. 2019
• Stable carbon isotopic composition of peat, subsoil and vegetation on natural and forestry-drained boreal peatlands. Nykänen, H; Mpamah, PA; Rissanen, AJ / Proceedings of 'The Centre of Excellence in Atmospheric Science (CoE ATM) - From Molecular and Biological processes to The Global Climate' Annual Meeting 2018. 2018. 2018
• Nykänen, Hannu; Mpamah, Promise A; Rissanen, Antti J. 2018. Stable carbon isotopic composition of peat columns, subsoil and vegetation on natural and forestry-drained boreal peatlands Isotopes in environmental and health studies 54 6: 622-641. 2018
• Rissanen, Antti J; Saarenheimo, Jatta; Tiirola, Marja; Peura, Sari; Aalto, Sanni L; Karvinen, Anu; Nykänen, Hannu. 2018. Gammaproteobacterial methanotrophs dominate methanotrophy in aerobic and anaerobic layers of boreal lake waters Aquatic Microbial Ecology 81 3: 257-276. 2018
• Peura, Sari; Buck, Moritz; Aalto, Sanni L; Morales, Sergio E; Nykänen, Hannu; Eiler, Alexander. 2018. Novel Autotrophic Organisms Contribute Significantly to the Internal Carbon Cycling Potential of a Boreal Lake mBio 9 4: e00916-18. 2018
• Jones Roger I, Kankaala Paula, Nykänen Hannu, Peura Sari, Rask Martti, Vesala Sami. 2017. Whole-Lake Sugar Addition Demonstrates Trophic Transfer of Dissolved Organic Carbon to Top Consumers Ecosystems 2018; 21 3: 495-506. 2017
• Kietäväinen R, Ahonen L, Niinikoski P, Nykänen H, Kukkonen I T. 2017. Abiotic and biotic controls on methane formation down to 2.5 km depth within the Precambrian Fennoscandian Shield Geochimica et Cosmochimica Acta 202 1: 124-145. 2017
• Mpamah PA, Taipale S, Rissanen AJ, Biasi C, Nykänen HK. 2017. The impact of long-term water level draw-down on microbial biomass: A comparative study from two peatland sites with different nutrient status European journal of soil biology 80: 59-68. 2017
• Rissanen Antti J, Karvinen Anu, Nykänen Hannu, Peura Sari, Tiirola Marja, Mäki Anita, Kankaala Paula. 2017. Effects of alternative electron acceptors on the activity and community structure of methane-producing and -consuming microbes in the sediments of two shallow boreal lakes. FEMS MICROBIOLOGY ECOLOGY 93 7: fix078. 2017
• Räisänen ML, Nykänen H, Mäkinen J, Heikkinen M-L. 2007. Junttiselän veden happamoituminen keväällä ja sitä säätelevät tekijät: Heikkinen M-L, Väisänen T.Pohjois-Pohjanmaan ympäristökeskus. Pohjois-Pohjanmaan ympäristökeskuksen raportteja. 33-39. 2007
• Kutzbach L, Schneider J, Sachs T, Giebels M, Nykänen H, Shurpali NJ, Martikainen PJ, Alm J, Wilmking M. 2007. CO2 flux determination by closed-chamber methods can be seriously biased by inappropriate application of linear regression. BIOGEOSCIENCES 4: 1005-1025. 2007
• Heikkinen M-L, Airiola S, Väisänen T, Nykänen H, Räisänen ML, Mäkinen J. 2007. Junttiselän kunnostusmahdollisuudet ja -suositukset: Heikkinen M-L, Väisänen T.Pohjois-Pohjanmaan ympäristökeskus. Pohjois-Pohjanmaan ympäristökeskuksen raportteja. 61-73. 2007
• Kankaala P, Taipale S, Nykänen H, Jones RI. 2007. Oxidation, efflux, and isotopic fractionation of methane during autumnal turnover in a polyhumic, boreal lake. JOURNAL OF GEOPHYSICAL RESEARCH D. 112 G02003: 7 s. 2007
• Liikanen A, Huttunen JT, Karjalainen SM, Heikkinen K, Väisänen TS, Nykänen H, Martikainen PJ. 2006. Temporal and seasonal changes in greenhouse gas emissions from a constructed wetland purifying peat mining runoff waters. ECOLOGICAL ENGINEERING 26: 241-251. 2006
• Maljanen M, Nykänen H, Moilanen M, Martikainen PJ. 2006. Greenhouse gas fluxes of coniferous forest floors as affected by wood ash addition. FOREST ECOLOGY AND MANAGEMENT 237: 143-149. 2006
• Martikainen PJ, Alm J, Huttunen JT, Hyppönen N, Jauhiainen J, Juutinen S, Koponen H, Kortelainen P, Larmola T, Liikanen A, Maljanen M, Nykänen H, Pekkarinen N, Repo M, Saari A, Shurpali N, Silvennoinen H, Silvola J, Vasander H. 2006. Greenhouse gas dynamics of terrestrial and aquatic environments: pristine ecosystems and land-use effects: Kulmala M, Lindroth A and Ruuskanen TM, Proceedings of BACCI, NECC and FCoE activities 2005.Aeroslitutkimusseura ry. Report Series in Aerosol Science. 375-381. 2006
• Huttunen JT, Nykänen H, Martikainen PJ, Shurpali NJ. 2004. Reed canary grass cultivation on cut-away peatlands and the ecosystem carbon balance: Päivänen J, Proceedings of the 12 th International Peat Congress. Wise Use of Peatlands Volume 2 Poster Presentations.International Peat Society. 977-982. 2004
• Nykänen H, Heikkinen JEP, Pirinen L, Tiilikainen K, Martikainen PJ. 2003. Annual CO2 exchange and CH4 fluxes on a subarctic palsa mire during climatically different years. GLOBAL BIOGEOCHEMICAL CYCLES 17 1: 1-18. 2003
• Nykänen H. 2003. Sensitivity of CH4 and N2O Dynamics in Boreal Peatlands to Anthropogenic and Global Changes. Kuopion yliopiston ympäristötieteiden laitosten monistesarja. 2003
• Huttunen JT, Nykänen H, Turunen J, Martikainen PJ. 2003. Methane emissions from natural peatlands in the northern boreal zone in Finland, Fennoscandia. ATMOSPHERIC ENVIRONMENT 37: 147-151. 2003
• Huttunen JT, Nykänen H, Martikainen PJ, Nieminen M. 2003. Fluxes of nitrous oxide and methane from drained peatlands following forest clear-felling in southern Finland. PLANT AND SOIL 255: 457-462. 2003
• Christensen TR, Ekberg A, Ström L, Mastepanov M, Panikov N, Öquist M, Svensson BH, Nykänen H, Martikainen PJ, Oskarsson H. 2003. Factors controlling large scale variations in methane emissions from wetlands. GEOPHYSICAL RESEARCH LETTERS 30 7: 67/1 - 67/4. 2003
• Huttunen JT, Väisänen TS, Heikkinen M, Hellsten S, Nykänen H, Nenonen O, Martikainen PJ. 2002. Exchange of CO2, CH4 and N2O between the atmosphere and two northern boreal ponds with catchments dominated by peatlands or forests PLANT AND SOIL 242: 137-146. 2002
• Huttunen JT, Väisänen TS, Hellsten SK, Heikkinen M, Nykänen H, Jungner H, Niskanen A, Virtanen MO, Lindqvist OV, Nenonen OS, Martikainen PJ. 2002. Fluxes of CH4, CO2, and N2O in hydroelectric reservoirs Lokka and Porttipahta in the northern boreal zone in Finland. GLOBAL BIOGEOCHEMICAL CYCLES 16 1: 1-17. 2002
• Nykänen H, Vasander H, Huttunen JT, Martikainen PJ. 2002. Effect of experimental nitrogen load on methane and nitrous oxide fluxes on ombrotrophic boreal peatland. PLANT AND SOIL 242: 147-155. 2002
• Kettunen A, Kaitala V, Alm J, Silvola J, Nykänen H, Martikainen PJ. 2000. Predicting variations in methane emissions from boreal peatlands through regression models BOREAL ENVIRONMENT RESEARCH 5: 115-131. 2000
• Korpijaakko M, Nykänen H, Martikainen PJ. 2000. The effect of depth and mire gases on the hydraulic conductivity of peat: Rochefort L, Daigle J-Y, Sustaining Our Peatlands. Proceedings of the 11th International Peat Congress.Gerry Hood. 605-612. 2000
• Tuittila E-S, Komulainen V-M, Vasander H, Nykänen H, Martikainen PJ, Laine J. 2000. Methane dynamics of a restored cut-away peatland. GLOBAL CHANGE BIOLOGY 6: 569-581. 2000
• Tuittila E-S, Komulainen V-M, Vasander H, Nykänen H, Martikainen PJ, Laine J. 2000. Vegetation succession controls methane emission from restored cut-away peatland: Rochefort L, Daigle J-Y, Sustaining Our Peatlands. Proceedings of the 11th International Peat Congress.Gerry Hood . 685-692. 2000
• Alm J, Saarnio S, Nykänen H, Silvola J, Martikainen PJ. 1999. Winter CO2, CH4 and N20 fluxes on some natural and drained boreal peatlands. BIOGEOCHEMISTRY 44: 163-186. 1999
• Alm J, Schulman L, Walden J, Nykänen H, Martikainen PJ, Silvola J. 1999. Carbon balance of a boreal bog during a year with an exceptionally dry summer. ECOLOGY 80 1: 161-174. 1999