caa a22 4500 606218300 CHVBK 20210128101112.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s11104-014-2328-x doi (NATIONALLICENCE)springer-10.1007/s11104-014-2328-x Does nitrate fertilization induce nox emission from scots pine (p. sylvestris) shoots? [Elektronische Daten] [J. Joensuu, M. Raivonen, A.-J. Kieloaho, N. Altimir, P. Kolari, T. Sarjala, J. Bäck] Aims: The possibility of NOx (NO + NO2) emissions from plants and the underlying mechanisms are still under discussion. Excess NO created possibly as a result of nitrite accumulation in plant leaves has been suggested to result in emissions. Such emission has been observed in laboratory conditions due to nitrate fertilization. In this study, we tested whether nitrate fertilization of Scots pine seedlings growing outdoors leads to accumulation of NO3- or NO2- in the needles and subsequent NOx emission. Methods: The experiment was done at the SMEAR II station in Southern Finland. The seedlings received nitrate or ammonium fertilizer or neither. Shoot NOx emissions were measured with dynamic chambers. Total dissolved nitrogen, inorganic nitrogen, NO3-, NO2- and NH4+ concentrations in the soil and needles were determined. Results: NOx fluxes from the shoots were, on average, deposition. There was no indication of fertilization-induced NO or NOx emissions. The highest NO fluxes were observed at night and were humidity-related. Conclusions: It seems unlikely that additional nitrate in the soil could cause significant NOx emission from boreal Scots pine forests in field conditions, possibly because of soil chemistry. The Author(s), 2014 Nitrogen oxides nationallicence Shoot emissions nationallicence Chamber measurements nationallicence Nitrogen fertilization nationallicence Joensuu J. Department of Forest Sciences, University of Helsinki, PO Box 27, 00014, Helsinki, Finland aut Raivonen M. Department of Forest Sciences, University of Helsinki, PO Box 27, 00014, Helsinki, Finland aut Kieloaho A.-J Division of Atmospheric Sciences, Department of Physics, University of Helsinki, PO Box 48, 00014, Helsinki, Finland aut Altimir N. Department of Forest Sciences, University of Helsinki, PO Box 27, 00014, Helsinki, Finland aut Kolari P. Department of Forest Sciences, University of Helsinki, PO Box 27, 00014, Helsinki, Finland aut Sarjala T. The Finnish Forest Research Institute, Kaironiementie 15, 39700, Parkano, Finland aut Bäck J. Department of Forest Sciences, University of Helsinki, PO Box 27, 00014, Helsinki, Finland aut Plant and Soil Springer International Publishing 388/1-2(2015-03-01), 283-295 0032-079X 388:1-2<283 2015 388 11104 https://doi.org/10.1007/s11104-014-2328-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-014-2328-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Joensuu J. Department of Forest Sciences, University of Helsinki, PO Box 27, 00014, Helsinki, Finland aut NATIONALLICENCE 700 1- Raivonen M. Department of Forest Sciences, University of Helsinki, PO Box 27, 00014, Helsinki, Finland aut NATIONALLICENCE 700 1- Kieloaho A.-J Division of Atmospheric Sciences, Department of Physics, University of Helsinki, PO Box 48, 00014, Helsinki, Finland aut NATIONALLICENCE 700 1- Altimir N. Department of Forest Sciences, University of Helsinki, PO Box 27, 00014, Helsinki, Finland aut NATIONALLICENCE 700 1- Kolari P. Department of Forest Sciences, University of Helsinki, PO Box 27, 00014, Helsinki, Finland aut NATIONALLICENCE 700 1- Sarjala T. The Finnish Forest Research Institute, Kaironiementie 15, 39700, Parkano, Finland aut NATIONALLICENCE 700 1- Bäck J. Department of Forest Sciences, University of Helsinki, PO Box 27, 00014, Helsinki, Finland aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 388/1-2(2015-03-01), 283-295 0032-079X 388:1-2<283 2015 388 11104