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Research article - Peer-reviewed, 2013

Long-term fertilization of a boreal Norway spruce forest increases the temperature sensitivity of soil organic carbon mineralization

Coucheney, Elsa; Strömgren, Monika; Lerch, Thomas; Herrmann, Anke

Abstract

Boreal ecosystems store one-third of global soil organic carbon (SOC) and are particularly sensitive to climate warming and higher nutrient inputs. Thus, a better description of how forest managements such as nutrient fertilization impact soil carbon (C) and its temperature sensitivity is needed to better predict feedbacks between C cycling and climate. The temperature sensitivity of in situ soil C respiration was investigated in a boreal forest, which has received long-term nutrient fertilization (22 years), and compared with the temperature sensitivity of C mineralization measured in the laboratory. We found that the fertilization treatment increased both the response of soil in situ CO2 effluxes to a warming treatment and the temperature sensitivity of C mineralization measured in the laboratory (Q10). These results suggested that soil C may be more sensitive to an increase in temperature in long-term fertilized in comparison with nutrient poor boreal ecosystems. Furthermore, the fertilization treatment modified the SOC content and the microbial community composition, but we found no direct relationship between either SOC or microbial changes and the temperature sensitivity of C mineralization. However, the relation between the soil C:N ratio and the fungal/bacterial ratio was changed in the combined warmed and fertilized treatment compared with the other treatments, which suggest that strong interaction mechanisms may occur between nutrient input and warming in boreal soils. Further research is needed to unravel into more details in how far soil organic matter and microbial community composition changes are responsible for the change in the temperature sensitivity of soil C under increasing mineral N inputs. Such research would help to take into account the effect of fertilization managements on soil C storage in C cycling numerical models.

Published in

Ecology and Evolution
2013, volume: 3, number: 16, pages: 5177-5188

Authors' information

Swedish University of Agricultural Sciences, Department of Chemistry
Swedish University of Agricultural Sciences, Department of Soil and Environment
Swedish University of Agricultural Sciences, Department of Soil and Environment
Lerch, Thomas
Swedish University of Agricultural Sciences, Department of Chemistry
Lerch, Thomas
Swedish University of Agricultural Sciences, Department of Soil and Environment
Lerch, Thomas
University of Paris-Est
Swedish University of Agricultural Sciences, Department of Chemistry

UKÄ Subject classification

Environmental Sciences

Publication Identifiers

DOI: https://doi.org/10.1002/ece3.895

URI (permanent link to this page)

https://res.slu.se/id/publ/51329