OPERATING INSTITUTE: University of Helsinki, Helsinki.
MAIN PURPOSE: Biosphere/atmosphere interaction and climate change.
ECOSYSTEM TYPE: Pine forest.
EXPERIMENTAL TREATMENTS: Prescribed burning.
LOCALISATION: 
OPERATING INSTITUTE: University of Helsinki, Helsinki.
MAIN PURPOSE: Biosphere/atmosphere interaction and climate change.
ECOSYSTEM TYPE: Pine forest.
EXPERIMENTAL TREATMENTS: Prescribed burning.
LOCALISATION: 61.8527363190335 24.29443359375
FACILITIES: The SMEAR site (Station for Measuring Ecosystem-Atmosphere Rela-tions) is situated at the Hyytiälä Forestry Field Station of the University of Helsinki. The site consists of a managed, 50 years old Scots pine forest stand, two open oligotrophic fen sites and a humic lake with forested catchment. The main idea of SMEAR-type infrastructures is continuous, comprehensive measurements of fluxes, storages and concentrations in the land ecosystem–atmosphere continuum. The forest measurements have been operated continuously since 1996, and include leaf, stand and ecosystem scale measurements of green-house gases, volatile organic com-pounds, pollutants (e.g. O3, SO2, NOx) and aerosols, in addition to a full suite of meteo-rological measurements. The biogeochemical cycles and vegetation-soil-atmosphere intera-ctions are studied both experimentally and with long-term observations. The site has full carbon, water and nitrogen budgets made over 10 years, and it is a full ICOS ecosystem station.
In summer 2012, 18 trenching plots were established in the pine stand, in order to analyse how plant input of recently assimi-lated carbohydrates to soil is linked to the decomposition of soil organic matter and utilisation of soil organic nitrogen sources.
In summer 2013, measurements of carbonyl 