Journal article
Effects of oxygen concentration on phosphorus release from reflooded air-dried wetland sediments
Marine and Freshwater Research, Vol.45(7), pp.1319-1328
1994
Abstract
Intact sediment cores from North Lake (Perth, Western Australia) were air-dried for 40 days, reflooded with lake water and incubated at 20°C. Under aerated conditions, air-drying increased phosphorus release. When aeration was stopped, air-dried sediments continued to release P into the water, but the rate was much slower than that in the early stage of the aeration. The results suggest a gradual depletion of labile phosphorus from the dried sediments. Under anaerobic conditions, the phosphate release was also markedly higher for air-dried sediments than for the 'wet' controls. The accumulation of soluble inorganic phosphorus during air-drying, owing to breakdown of organic material and a drying-induced decrease in phosphate sorption, may be the cause of release on rewetting. The results suggest that drought-induced sediment dehydration in natural wetlands may be followed by a significant increase of internal phosphorus loading under both aerobic and anaerobic conditions. Care must therefore be taken in using drawdown as a lake management technique to improve water quality.
Details
- Title
- Effects of oxygen concentration on phosphorus release from reflooded air-dried wetland sediments
- Authors/Creators
- S. Qiu (Author/Creator)A.J. McComb (Author/Creator)
- Publication Details
- Marine and Freshwater Research, Vol.45(7), pp.1319-1328
- Publisher
- CSIRO Publishing
- Identifiers
- 991005544452307891
- Copyright
- © CSIRO 1994
- Murdoch Affiliation
- School of Environmental Science
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.2 Marine Biology
- 3.2.216 Lake Ecosystems
- Web Of Science research areas
- Fisheries
- Limnology
- Marine & Freshwater Biology
- Oceanography
- ESI research areas
- Plant & Animal Science