Sammanfattning

Recent investigations have highlighted the relative importance of the winter season for emissions of N2O from boreal soils. However, our understanding of the processes and environmental controls regulating these emissions is fragmentary. Therefore, we investigated the potential for, and relative importance of, N2O formation at temperatures below 0 degreesC in laboratory experiments involving incubations of a Swedish boreal forest soil. Our results show that frozen soils have a high potential for N2O formation and subsequent emission. Net N2O production rates at -4 degreesC equaled those observed at +10 to +15 degreesC at moisture contents >60% of the soil's water-holding capacity. The source of this N2O was found to be denitrification occurring in anoxic microsites in the frozen soil and temperature per se did not control the denitrification rates at temperatures around 0 degreesC. Furthermore, both net nitrogen-mineralisation and nitrification were observed in the frozen soil samples. Based on these findings we propose a conceptual model for the temperature response of N2O formation in soils at low temperatures. (C) 2004 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved

Publicerad i

FEMS Microbiology Ecology
2004, Volym: 49, nummer: 3, sidor: 371-378
Utgivare: ELSEVIER SCIENCE BV

SLU författare

• Persson, Tryggve

  • Institutionen för ekologi och miljövård, Sveriges lantbruksuniversitet
    

• Nilsson, Mats

  • Institutionen för skogsekologi, Sveriges lantbruksuniversitet
    

• Öquist, Mats

  • Institutionen för skogsekologi, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Miljö- och naturvårdsvetenskap
Skogsvetenskap


Publikationens identifierare

DOI: https://doi.org/10.1016/j.femsec.2004.04.006

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/5469