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O 2 distribution and dynamics in the rhizosphere of Phragmites australis, and implications for nutrient removal in sediments.
- Source :
-
Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2021 Oct 15; Vol. 287, pp. 117193. Date of Electronic Publication: 2021 May 02. - Publication Year :
- 2021
-
Abstract
- Root-triggered microscale variations in O <subscript>2</subscript> distribution in the rhizosphere of young Phragmites australis are important for nutrient removal in sediments. In this study, the micro-scale O <subscript>2</subscript> dynamics and the small-scale changes of soluble reactive phosphorus (SRP) and ammonium (NH <subscript>4</subscript> <superscript>+</superscript> ) in the rhizosphere of P. australis were investigated using planar optodes and high-resolution dialysis (HR-Peeper), respectively. Results suggested that root O <subscript>2</subscript> leakage has a highly variable distribution depending on the stage of root growth, the site of O <subscript>2</subscript> leakage gradually shift from the entire emerging main roots to the main root tip and subsequently shifted the emerging lateral roots. The O <subscript>2</subscript> concentration increased in the rhizosphere with increasing light intensity and O <subscript>2</subscript> levels in the overlying water. Continuous O <subscript>2</subscript> release from the lateral roots causes the formation of iron plaque on the surface of lateral roots, which reduce the mobility of P by adsorption of iron plaque in the rhizosphere. The oscillation of oxic-anoxic root zones improves nitrogen removal through the processes of anammox, heterotrophic denitrification and nitrification. This work from the micro-scale demonstrates that the O <subscript>2</subscript> concentration is the spatio-temporal variations in the rhizosphere, and it presents an important role for nutrient removal in sediments.<br /> (Copyright © 2021 Elsevier Ltd. All rights reserved.)
- Subjects :
- Nutrients
Phosphorus
Poaceae
Plant Roots
Rhizosphere
Subjects
Details
- Language :
- English
- ISSN :
- 1873-6424
- Volume :
- 287
- Database :
- MEDLINE
- Journal :
- Environmental pollution (Barking, Essex : 1987)
- Publication Type :
- Academic Journal
- Accession number :
- 33989948
- Full Text :
- https://doi.org/10.1016/j.envpol.2021.117193