Biosphere-atmosphere exchange of reactive nitrogen and greenhouse gases at the NitroEurope core flux measurement sites: measurement strategy and first data sets

摘要: The NitroEurope project aims to improve understanding of the nitrogen (N) cycle at continental scale and quantify major fluxes reactive N by a combination measurements modelling activities. As part overall measurement strategy, network 13 flux ‘super sites’ (Level-3) has been established, covering European forest, arable, grassland wetland sites, with objective quantifying budget high spatial resolution temporal frequency for 4.5 years, estimate greenhouse gas budgets (N2O, CH4 CO2). These sites are supported low-cost (Level-2, 9 sites) infer 58 (Level-1), comparison carbon (C) measurements. Measurements Level-3 include N2O, NO (also CH4, CO2) fluxes, wet dry deposition, leaching C transformations in plant, litter soil. Results first 11 months (1.8.2006 30.6.2007) suggest that grasslands largest source forests sink deposition rates influence N2O non-agricultural ecosystems. emission ratio is influenced soil type precipitation. First entering leaving ecosystem net exchange outlined. Further information on denitrification N2 biological fixation required complete some sites. quantitative roles played CO2, defining differ widely between ecosystems depending interactions climate, type, land use management.