Nitrogen addition alters composition, diversity, and functioning of microbial communities in mangrove soils : an incubation experiment

Craig, H, Antwis, RE ORCID: https://orcid.org/0000-0002-8849-8194, Cordero, I, Ashworth, D, Robinson, CH, Osborne, TZ, Bardgett, RD, Rowntree, JK and Simpson, LT 2021, 'Nitrogen addition alters composition, diversity, and functioning of microbial communities in mangrove soils : an incubation experiment' , Soil Biology and Biochemistry, 153 , p. 108076.

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Abstract

Mangrove ecosystems are important for carbon storage due to their high productivity and low decomposition rates. Waterways have experienced increased nutrient loads as a result of anthropogenic activities and it is unclear how this may affect carbon and nutrient cycles in downstream mangroves that receive these nutrient-rich waters. Using a laboratory-based incubation experiment, this study aimed to assess the effects of nutrient addition on the diversity and structure of mangrove soil bacterial communities, as well as biomass and activity of the soil microbial community, under different oxygen conditions. Bacterial community diversity and composition was characterised using 16S rRNA gene sequencing and microbial activity was examined through the measurement of microbial respiration and the activities of enzymes associated with organic matter decomposition. Nitrogen addition caused clear shifts in bacterial community composition, with decreases in bacterial diversity and the abundance of sulfate-reducing bacteria. Microbial biomass also decreased with nitrogen addition under reduced oxygen incubations. Changes in bacterial community structure were accompanied by changes in the activity of some enzymes involved in carbon, nitrogen and phosphorus cycling. Under reduced oxygen conditions, nitrogen addition resulted in a significant increase in the microbial metabolic quotient but no accompanying change in microbial respiration, which was explained by a decrease in microbial biomass. The findings of this study indicate that nitrogen loading has potential implications for microbial communities and carbon and nutrient cycling in mangrove environments that warrant further investigation under field conditions.

Item Type:	Article
Additional Information:	** From Elsevier via Jisc Publications Router **Journal IDs: issn 00380717 **History: issue date 18-11-2020; accepted 13-11-2020
Schools:	Schools > School of Environment and Life Sciences
Journal or Publication Title:	Soil Biology and Biochemistry
Publisher:	Elsevier
ISSN:	0038-0717
Related URLs:	Publication
Funders:	Natural Environment Research Council (NERC) EAO Doctoral Training Partnership, Ramon Areces Foundation Research Fellowship, Biotechnology and Biological Sciences Research Council (BBSRC) Discovery Fellowship
SWORD Depositor:	Publications Router
Depositing User:	Publications Router
Date Deposited:	24 Nov 2020 08:59
Last Modified:	16 Feb 2022 06:18
URI:	https://usir.salford.ac.uk/id/eprint/58895

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