A5054186342- Peatlands and Wetlands Ecology
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Coastal wetland ecosystem dynamics
- Marine and coastal ecosystems
- Botany and Plant Ecology Studies
- Soil and Water Nutrient Dynamics
- Microbial Community Ecology and Physiology
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Acoustic Wave Phenomena Research
- Fish Ecology and Management Studies
- Isotope Analysis in Ecology
- Fire effects on ecosystems
- Wastewater Treatment and Nitrogen Removal
- Vehicle Noise and Vibration Control
- Plant Water Relations and Carbon Dynamics
- Genomics and Phylogenetic Studies
- Bioenergy crop production and management
- Advanced Adaptive Filtering Techniques
- Soil Carbon and Nitrogen Dynamics
- Marine Bivalve and Aquaculture Studies
- Forest Ecology and Biodiversity Studies
- Marine Biology and Ecology Research
University of Eastern Finland
2008-2024
Finland University
2017-2022
FishBase Information and Research Group
2021
University of Jyväskylä
2009-2018
Aalto University
2015
VTT Technical Research Centre of Finland
2000-2007
Abstract Wetlands are the largest natural source of atmospheric methane. Here, we assess controls on methane flux using a database approximately 19 000 instantaneous measurements from 71 wetland sites located across subtropical, temperate, and northern high latitude regions. Our analyses confirm general emissions soil temperature, water table, vegetation, but also show that these relationships modified depending type (bog, fen, or swamp), region (subarctic to temperate), disturbance. Fen was...
1 Co2 emissions in boreal peatlands were measured during two seasons on various mire site types representing different nutrient statuses and water tables. In order to examine the long term effects of table draw-down CO2 fluxes, sites also included 25-50-year-old drainages. 2 On virgin lowest fluxes at ombrotrophic dominated by Sphagnum fuscum (78-127mg m-2 h-' 12 ?C, 60-200 g CO2-C year') highest with abundant understorey vegetation (183-259mg 290-340g C02-C year-'). 3 Lowering cm increased...
Global wetlands are, at estimate ranging 115–237 Tg CH 4 /yr, the largest single atmospheric source of greenhouse gas methane (CH ). We present a dataset on flux rates totaling 12 measurement years sites from Greenland, Iceland, Scandinavia and Siberia. find that temperature microbial substrate availability (expressed as organic acid concentration in peat water) combined explain almost 100% variations mean annual emissions. The sensitivity emissions shown suggests feedback mechanism climate...
Abstract. Closed (non-steady state) chambers are widely used for quantifying carbon dioxide (CO2) fluxes between soils or low-stature canopies and the atmosphere. It is well recognised that covering a soil vegetation by closed chamber inherently disturbs natural CO2 altering concentration gradients soil, overlying air. Thus, driving factors of not constant during experiment, no linear increase decrease over time within headspace can be expected. Nevertheless, regression has been applied...
Greenhouse gas fluxes (CH4, N20 and C02) at a managed Finnish peat soil site were compared with those in virgin fen 1991 1992. The field was drained about 60 years ago, as it used for pasturing fodder production, the CH4 released by cattle estimated on basis of data literature. annual budgets gases their GWP values calculated to assess climatic impact current agricultural activity. Methane emission from site, 1 kg CH4-C ha- yr- 1, low, that natural 260 1. Annual 8 9 N20-N ha - yr 1992,...
Northern peatlands are important terrestrial carbon stores, and they show large spatial temporal variation in the atmospheric exchange of CO2 CH4. Thus, annual balance must be studied detail order to predict climatic responses these ecosystems. Closed-chamber methods were used study CH4 hollow, Sphagnum angustifolium lawn, S. fuscum hummock microsites within an ombrotrophic bog. Micrometeorological tower measurements as a reference for efflux from Low precipitation during May–August 1994 (84...
Methane (CH 4 ) fluxes were measured at 17 peatland sites with different nutritional and hydrological characteristics in the southern middle boreal zones Finland by a static chamber technique. Many of natural peatlands also had counterparts drained for forestry 30–50 years ago. The mean emissions from May to September 8.0 g CH m −2 ombrogenous bogs 19.0 minerogenous fens thus being higher than 2 yr −1 estimated Canadian peatlands. Change water table level greater effect on bogs. 3.9 0.3 ,...
Summary We measured a cut‐away peatland's CH 4 dynamics using the static chamber technique one year before and two years after restoration (rewetting). The emissions were related to variation in vegetation abiotic factors multiple linear regression. A statistical model for flux with cottongrass cover ( Eriophorum vaginatum L.), soil temperature, water level, effective temperature sum index as driving variables explained most r 2 = 0.81) of temporal spatial variability fluxes. In addition...
Peatlands are a major natural source of atmospheric methane (CH4). Emissions from Sphagnum-dominated mires lower than those measured other mire types. This observation may partly be due to methanotrophic (i.e., methane-consuming) bacteria associated with Sphagnum. Twenty-three the 41 Sphagnum species in Finland can found peatland at Lakkasuo. To better understand Sphagnum-methanotroph system, we tested following hypotheses: (1) all these support bacteria; (2) water level is key environmental...
Abstract Permafrost peatlands are biogeochemical hot spots in the Arctic as they store vast amounts of carbon. thaw could release part these long‐term immobile carbon stocks greenhouse gases (GHGs) dioxide (CO 2 ) and methane (CH 4 to atmosphere, but how much, at which time‐span gaseous species is still highly uncertain. Here we assess effect permafrost on GHG dynamics under different moisture vegetation scenarios a peatland. A novel experimental approach using intact plant–soil systems...
Arctic wetlands are known methane (CH
Concentrations and fluxes of greenhouse gases methane (CH 4 ), carbon dioxide (CO 2 nitrous oxide (N O) were measured during open water conditions in two hydroelectric reservoirs, Lokka Porttipahta, the northern boreal zone Finland. These reservoirs located on peat forest soils built 1967 1970, respectively. Over 20 years after their flooding, still largely supersaturated with dissolved CH CO . Measured floating static chambers, stations released more (means 5.3–119 mg m −2 d −1 ) periods...
We studied the oxidation and efflux of methane (CH 4 ) in a small, polyhumic lake, Mekkojärvi (southern Finland), during 6 weeks autumn when stability water mass first weakened, temporarily restabilized, finally mixed completely. During summer stratification period, CH had accumulated anoxic hypolimnion to high concentrations (>150 mmol m −3 ). Gradual mixing column allowed access both oxygen by aerobic methane‐oxidizing bacteria (MOB) deeper column. Thus bulk (∼83–88%) was subsequently...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 81:257-276 (2018) - DOI: https://doi.org/10.3354/ame01874 Gammaproteobacterial methanotrophs dominate methanotrophy in aerobic and anaerobic layers of boreal lake waters Antti J. Rissanen1,2,*, Jatta Saarenheimo2, Marja Tiirola2, Sari Peura3, Sanni L. Aalto2, Anu Karvinen4, Hannu Nykänen2,5 1Tampere University...