Transport processes, freezing, embolism
My research is on tree structure and function, especially on transport processes within the tree and on the challenges these processes face in different environments. My special interest is on freezing behavior of wood.
Nitrogen emissions, soils, organic nitrogen, nutrients
I study the emissions of volatile organic nitrogen compounds from soil, the environmental conditions and processes affecting the emissions, and the nutrient load that organic nitrogen holds in soils.
Atmosphere-biosphere interactions, planetary boundary layer oxidation processes, emissions of biogenic volatile organic compounds, boreal ecosystem
My main research topic is to investigate the drivers of both induced and constitutive production and emission of biogenic volatile organic compounds from trees and forest floor and how these emissions influence the chemical composition of the atmosphere. It is very important to study these aspects, since biogenic volatile organic compounds influence atmospheric aerosol formation and growth in forested areas and thus contribute to climate change
Phytoplankton ecology and nutrient, biomolecule and gas cycling
My research interests are in the microscopical-sized life forms of lakes, especially in phytoplankton, and their roles in aquatic food webs. Particularly I’m interested in mixotrophy, grazing and exudate release (e.g. volatile organic compounds, BVOC’s) which are closely related to nutrient, biomolecule and gas cycling. My previous research topics have included studies on phytoplankton community composition and primary production as well as using phytoplankton as a potential source of oil for biodiesel production.
Soil type properties, forest regeneration
I try in my project (Forest soil classification for forest regeneration) to find such variables are of major importance in the planning of forest regeneration. The most interesting properties are water and oxygen concentrations in soil profile since the Site Type classification quite well describes the chemical properties (e.g. fertility) and the most promising variables are the soil type properties (e.g. the colours of the mineral soil horizons and soil type).
Passive remote sensing, modeling, vegetation dynamics, spectroscopy, photosynthesis, wildfires
Developing a model that will help to interpret passive remote sensing signals of forests. The relationship between remote sensing signals and photosynthetic efficiency is complicated and non-linear. Mechanistic models can help to explain the underlying physiological and physical causes of remote sensing observations and provide a robust platform for the use of such signals in estimating carbon fixation rates.
Aquatic physics, lake-atmosphere interactions, carbon and nutrient cycles in aquatic systems
I study gas exchange in air-water interfaces and lake modeling. I use novel and continuous measurements systems, such as full ecosystem scale floating platform with eddy covariance setup for gas fluxes, combined with turbulence, gas and temperature measurement setup from the water column. It seems that gas transfer is two to three times faster than previously estimated. Carbon loading from the catchment influences light extinction and thus has crucial effect on aquatic physics. This results in various changes in lake ecosystem, from thermal structure and nutrient transport to length of the open-water period. My aim is to further incorporate basic terrestrial-aquatic research to modeling which allows the estimation of the response of aquatic ecosystems to changes in the catchment, such as land-use change and precipitation alterations due to climate change.
BVOC's, emissions budgets, emission potentials, shoot growth, VOC emissions modeling, boreal forests
Long term measurements of VOC emissions from Scots pine and European aspen using online measurement methods: understanding the dynamics, temperature dependency and the emission potentials in Scots pine. Estimating foliage biomass growth by photographic methods and the contribution of developing needle mass on the total foliage VOC emissions. Fomring VOC emission budget of Scots pine stand including VOC emission process-based modeling.
Forest soil, carbon cycling, ectomychorrhizal fungi
My major research interest is carbon cycling in forest soil and the role of ectomycorrhizal fungi in belowground carbon dynamics. In addition, I am interested in the enzymes as well as other metabolites (VOC-compounds, bioactive compounds) produced by fungi. My earlier projects include studies on fungal bioremediation and biodiversity.
Carbon dynamics in forest soils, with special interest in disturbed (fire, wind, reindeer grazing, etc.) areas
My current projects include measuring the short and long term effects of forest fires on the stability of carbon pools in boreal forests, estimating carbon turnover on disturbed forest areas and studying the carbon neutrality of reindeer management.
Gas-phase nitrogen exchange, methane emissions, wetlands
Exchange of reactive gas-phase nitrogen compounds between atmosphere and vegetation and global modelling of methane emissions from wetlands.
Greenhouse gases in boreal forest soil and trees, methane, nitrous oxide
Greenhouse gas sources and sinks in boreal forest soils and trees, processes of methane and nitrous oxide exchange and factors affecting the fluxes. Seasonality in the production, transport and emissions of CH4 from trees in boreal forest ecosystems, revealing sources of biological methane production in boreal upland forests.
Terrestrial ecology, biogeochemistry of air-land interactions, ozone deposition, ozone scavenging
I have studied primarily ozone deposition to vegetation and the mechanisms behind the process and currently I am interested in the potential role of BVOCs and aerosol load in ozone scavenging. I am also involved in research on C and N cycling in high-mountain pastures in the Pyrenees, studying the role of plant diversity
Ecosystem services, urban landscape, water environment
Sustainable urban landscape management, built and specifically water environment sensitive ecosystem services in urban areas, coordinating Life+ Keidas project.
Climate change, Ecosystem services, Ecosystem water-balance, Plant-water relations, Tree growth
Xylem transport, phloem transport, tree water relations
My research focuses on the water transport from the ground up to the leaves in the xylem and the transport of sugars from the leaves into other parts of the tree in the phloem. The transport processes and their functionality in varying seasons and environmental conditions create limitations for tree size and structure and also affect the carbon assimilation capacity of a tree.
Carbon cycling, interactions between ecosystems
My research interests are in carbon cycling in different ecosystem and especially between them. After finishing a postdoc related to CO2 and CH4 emissions from lakes and small rivers in Canada, I'm back at the department of Forest Sciences. Now I'm working more to create conditions for research then with research itself. I am part of Advance_eLTER project which aims to develop the long-term ecosystem research infrastructure so that it will be accepted to the ESFRI roadmap.