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Biofilms attached to Myriophyllum spicatum play a dominant role in nitrogen removal in constructed wetland mesocosms with submersed macrophytes: Evidence from 15N tracking, nitrogen budgets and metagenomics analyses.
- Source :
- Environmental Pollution; Nov2020:Part 2, Vol. 266, pN.PAG-N.PAG, 1p, 2 Charts
- Publication Year :
- 2020
-
Abstract
- The mechanisms behind nitrogen removal by the submersed macrophyte-biofilm complex in wetlands remain to be fully elucidated. This study investigated the role of Myriophyllum spicatum and the biofilm on their leaves in nitrogen removal in mesocosm experiments. <superscript>15</superscript>N tracking showed that 61.9% and 30% of the <superscript>15</superscript>N, respectively, was removed from the system and assimilated by the macrophyte-biofilm complex after loading with 5.4 mg L<superscript>−1</superscript><superscript>15</superscript>N labelled NH 4 <superscript>+</superscript> for 17 days. Nitrogen budget results showed that about 0.2%, 0.2% and 3.6% of the nitrogen were emitted as water-, HCl- and NaOH-soluble nitrogen-gas species, respectively. Bacteria (76.7–91.8%) were the predominant domain in all samples, followed by eukaryotes (8.0–23.0%), archaea and viruses. Network analyses showed that there were positive- and negative-correlative relationships among nitrogen-cycling genes and nitrifiers and denitrifiers. Our data highlight the important role of biofilm on submersed macrophytes for nitrogen removal. Image 1 • M. spicatum restoration promoted nitrogen removal in constructed wetlands (mesocosm scale). • The biofilms had a higher competitiveness for waterborne nitrogen than M. spicatum. • Bacteria were the most dominant domain, followed by eukaryotes, archaea and viruses. • There were complex interactions among nitrogen-cycling genes and genera. The biofilms had a higher competitiveness for nitrogen than M. spicatum and there were complex interactions among nitrogen-cycling genes and genera in biofilms. [ABSTRACT FROM AUTHOR]
- Subjects :
- POTAMOGETON
CONSTRUCTED wetlands
EURASIAN watermilfoil
BIOFILMS
MACROPHYTES
NITROGEN
Subjects
Details
- Language :
- English
- ISSN :
- 02697491
- Volume :
- 266
- Database :
- Supplemental Index
- Journal :
- Environmental Pollution
- Publication Type :
- Academic Journal
- Accession number :
- 145651939
- Full Text :
- https://doi.org/10.1016/j.envpol.2020.115203