Abstract
We studied potential methane (CH4) production and Fe (III) oxide reduction activity in sediments sampled from 12 vegetated littoral sites at eight lakes in Finland. The effects of added amorphous Fe (III) oxyhydroxide and organic substrate (acetate) on methanogenic and Fe (III) reduction activities were studied in anaerobic laboratory incubations (in vitro). The concentration of total iron in the sediments varied between 0.3 and 7.7 % (DW) and their organic matter content (loss of ignition) varied between 1 and 64 % (DW). The potential methane production at vegetated littoral sites varied greatly and was between 0.4 and 312 μmol CH4 kg−1d−1. Fe (III) addition suppressed methane production by over 50 % if the total iron content in the studied littoral sediment was ≥3 % (DW). Our results show that Fe (III) reduction is an important factor for organic matter decomposition in boreal freshwater littoral sediments. In addition to affecting methanogenesis, iron may also play a role in suppressing other microbial activities in anaerobic soils and sediments.
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Acknowledgments
This research was supported financially by the Maj and Tor Nessling foundation. We wish to thank Kari Ratilainen (Department of Biology, University of Eastern Finland) and Jussi Vilen (Lammi Biological Station, University of Helsinki) for their help with collecting sediment and peat samples, and Sanna Saarnio (University of Eastern Finland, Joensuu) for her helpful suggestions on the manuscript. We are grateful to two anonymous reviewers for their suggestions improving the manuscript.
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Karvinen, A., Lehtinen, L. & Kankaala, P. Variable Effects of Iron (Fe (III)) Additions on Potential Methane Production in Boreal Lake Littoral Sediments. Wetlands 35, 137–146 (2015). https://doi.org/10.1007/s13157-014-0602-6
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DOI: https://doi.org/10.1007/s13157-014-0602-6