Journal article
Fire increases the risk of higher soil N2O emissions from Mediterranean Macchia ecosystems
Technical University of Denmark1
Karlsruhe Institute of Technology2
Federal Research and Training Centre for Forests3
Universidad Politécnica de Madrid4
University of Castilla-La Mancha5
Fundación General del Medio Ambiente de Castilla-La Manch6
Department of Chemical and Biochemical Engineering, Technical University of Denmark7
Intensification of droughts under climate change is projected to increase fire frequency in the Mediterranean region. Fires cause direct emission of greenhouse gases (GHG) such as carbon dioxide (CO2) and nitrous oxide (N2O), due to the combustion of organic matter, creating a positive feedback on climate change.
However, the potential importance of indirect GHG emissions due to changes in soil biological and chemical properties after fire is less well known. Increased soil mineral nitrogen (N) concentrations after fire pose a risk for increased emissions of gaseous N, but studies on the post-fire N2O production and soil N turnover rates (mineralization, nitrification, microbial immobilization, denitrification) are still rare.
We determined N2O production, rates of N turnover and pathways for N2O production from the soil of burned and unburned plots of a Macchia shrubland in central Spain using a 15N labelling approach. Measurements were initiated before the controlled burning and continued for up to half a year after fire.
Fire markedly increased the risk of N2O emissions from soil through denitrification (N2O production rate was 3 to ≈30 times higher in burned soils compared to control, with N2O being produced solely from soil nitrate). In contrast, soil gross N cycling rates were not accelerated after fire. Thus, the increased N2O production was not closely linked with N mineralization, but may be explained by increased mineral N availability from ash, increased pH in burned plots, and less competition for available N and C sources due to absence of plants.
Language: | English |
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Year: | 2015 |
Pages: | 44-51 |
ISSN: | 18793428 and 00380717 |
Types: | Journal article |
DOI: | 10.1016/j.soilbio.2014.12.013 |
Carbon dioxide Climate change Denitrification Feedback Fire effect Fire effects Fires Greenhouse gases Greenhouse gases (GHG) Mediterranean Macchia Mediterranean region Microbial immobilization Mineralogy N cycling Nitrification Nitrogen oxides Nitrous oxide SDG 13 - Climate Action Soil mineral nitrogen Soil pollution Soils