The role of willow roots in sub-surface oxygenation of vegetation filter beds - Mass spectrometer investigations in Wales, U.K.

Randerson, Peter F. ORCID: https://orcid.org/0000-0002-2744-3122, Jordan, Gareth and Williams, Haydn G. 2007. The role of willow roots in sub-surface oxygenation of vegetation filter beds - Mass spectrometer investigations in Wales, U.K. Ecohydrology and Hydrobiology 7 (3-4) , pp. 255-260. 10.1016/S1642-3593(07)70108-8

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Abstract

Membrane inlet mass spectrometry (MIMS) was used to monitor dissolved gas concentrations in-situ in laboratory microcosms and in a constructed willow vegetation filter bed used to treat leachate. Diurnal cycles in the concentrations of oxygen, carbon dioxide and methane were seen. O2 is released from willow roots during daylight. CO2 and CH4 accumulate during the dark. Results also demonstrate sub-surface spatial heterogeneity in the willow bed, with locally high concentrations of O2 within otherwise anoxic zones. This technique enables direct measurement of subsurface environments in constructed wetlands, and provides evidence of the oxygenation capacity of willow vegetation filters.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences
ISSN:	1642-3593
Last Modified:	07 Nov 2022 10:32
URI:	https://orca.cardiff.ac.uk/id/eprint/132587

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