Home About Browse Search
Svenska


The role of organic matter and microbial community controlling nitrate reduction under elevated ferrous iron concentrations in boreal lake sediments

Jantti, Helena and Jilbert, Tom and Aalto, Sanni L. and Simojoki, Asko and Mangayil, Rahul and Peura, Sari and Rissanen, Antti J. (2022). The role of organic matter and microbial community controlling nitrate reduction under elevated ferrous iron concentrations in boreal lake sediments. Hydrobiologia. 849 :9 , 2145-2160
[Research article]

[img] PDF
796kB

Abstract

The nitrogen availability, that affects the greenhouse gas emission and the trophic level of lakes, is controlled mainly by microbial processes. We measured in a boreal nitrate and iron rich lake how the rates of potential denitrification and dissimilatory nitrate reduction to ammonia (DNRA) are affected by degradability of organic matter and availability of aqueous ferrous iron. We also investigated the microbial community by using 16S rRNA gene and shotgun metagenomic sequencing approach, which allows taxonomic analyses and detection of metagenome-assembled genomes (MAGs) containing genes for both nitrate reduction and iron oxidation. The results show that truncated denitrification, leading to release of nitrous oxide, is favored over dinitrogen production in conditions where the degradability of the organic matter is low. DNRA rates were always minor compared to denitrification and appeared to be independent of the degradability of organic carbon. Reduced iron stimulated nitrate reducing processes, although consistently only DNRA. However, the proportion of MAGs containing DNRA genes was low suggesting chemistry driven stimulation by reduced iron. Nevertheless, the metagenomic analyses revealed unique taxa genetically capable of oxidizing iron and reducing nitrate simultaneously. Overall, the results highlight the spatial variability in microbial community and nitrous oxide emissions in boreal lake sediments.

Authors/Creators:Jantti, Helena and Jilbert, Tom and Aalto, Sanni L. and Simojoki, Asko and Mangayil, Rahul and Peura, Sari and Rissanen, Antti J.
Title:The role of organic matter and microbial community controlling nitrate reduction under elevated ferrous iron concentrations in boreal lake sediments
Series Name/Journal:Hydrobiologia
Year of publishing :2022
Volume:849
Number:9
Page range:2145-2160
Number of Pages:16
Publisher:SPRINGER
ISSN:0018-8158
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Keywords:Boreal lake, Iron, Microbial community, Nitrate reduction, Nitrogen, Nitrous oxide, Sediment
URN:NBN:urn:nbn:se:slu:epsilon-p-116744
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116744
Additional ID:
Type of IDID
DOI10.1007/s10750-022-04858-0
Web of Science (WoS)000773806200001
Scopus2-s2.0-85127286466
ID Code:27824
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Deposited By: SLUpub Connector
Deposited On:14 May 2022 01:25
Metadata Last Modified:14 May 2022 05:01

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits