Denitrifying microbial communities along a boreal stream with varying land-use
Aalto, S. L., Saarenheimo, J., Arvola, L., Tiirola, M., Huotari, J., & Rissanen, A. J. (2019). Denitrifying microbial communities along a boreal stream with varying land-use. Aquatic Sciences, 81(4), Article 59. https://doi.org/10.1007/s00027-019-0654-z
Published inAquatic Sciences
DisciplineAkvaattiset tieteetYmpäristötiedeNanoscience CenterAquatic SciencesEnvironmental ScienceNanoscience Center
© The Author(s) 2019
Streams have an important role in regulating nitrogen (N) transportation from terrestrial ecosystems to downstream waters. Here, we examined how catchment land-use affects potential denitrification rates and the function and composition of denitrifier communities in boreal stream sediments, using stable isotope incubations and qPCR and 454-pyrosequencing targeted on nirS, nirK and nosZ genes. Although land-use influenced the water chemistry as higher nitrite + nitrate (NO x − ) concentration at the agriculture-affected sampling point, sediment organic matter content was found to be the key factor in regulating potential denitrification rates. However, the abundance as well as the diversity and community composition of denitrifying microbes, and genetic N2O production potential (the ratio between nirS + nirK and nosZ gene abundances) were connected to both NO x − and sediment quality. Overall, our results suggest that catchment land-use-driven changes in N and carbon availability affect the denitrification rates, and possibly N2:N2O production ratio, in boreal streams, through altering denitrifier abundance and community composition. ...
ISSN Search the Publication Forum1015-1621
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Related funder(s)European Commission
Funding program(s)FP7 (EU's 7th Framework Programme)
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingThis work was supported by the Academy of Finland Projects (310302 to SLA, 127922 to LA, 260797 to MT, 286642 to AJR), ENSTE graduate school grant for JS, and European Research Council (ERC) CoG project (615146 to MT).
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