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Diurnal fluctuations in root oxygen release rate and dissolved oxygen budget in wetland mesocosm
Author(s)
Date Issued
2011-05
Date Available
2011-08-26T15:42:52Z
Abstract
To assess the role of plants for oxygen offering in constructed wetlands, this study experimentally evaluated the amount of root oxygen release rate using mass balance method. The mass balance calculation is based on the following components: respiratory oxygen consumption of the roots; oxygen required for degradation of the organic matters; oxygen required for nitrification; and the amount of dissolved oxygen in the influent, effluent and substrate water. Experimental results have demonstrated that the root oxygen release rate was ranged from 20.3 to 58.3gO2/m2.d with average value of 38.4gO2/m2.d, which was affected dramatically by light intensity. Only 35% and 9% of the oxygen released by roots were used in the degradation of organic matters and nitrogen-nitrification, respectively, while 56% was used for roots respiration with little to be released to the surrounding medium. The results also showed that diurnal fluctuation of oxygen release and light intensity followed unimodal distribution. Meanwhile, a better understanding of the DO (dissolved oxygen) budget was proposed. Root oxygen release rate could be described by two fractions. One is “net specific oxygen release rate” and the other is “dischargeable oxygen release rate”.
Sponsorship
Other funder
Other Sponsorship
The National Natural Science Foundation of China (NSFC)
Ministry of Water Resources the People's Republic of China
Type of Material
Journal Article
Publisher
Elsevier
Journal
Desalination
Volume
272
Issue
1-3
Start Page
254
End Page
258
Copyright (Published Version)
2011 Elsevier
Subject – LCSH
Constructed wetlands
Gases from plants--Measurement
Water--Dissolved oxygen
Mass budget (Geophysics)
Biological rhythms in plants
Web versions
Language
English
Status of Item
Peer reviewed
ISSN
0011-9164
This item is made available under a Creative Commons License
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